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Please wait a minute... For Selected: Download Citations EndNote Ris BibTeX Toggle Thumbnails Select Liu Henian, Shi Buqing, Xue Liangqing, Wan Lunkun, Pan Xiaohua, Ji Zhifeng, Li Zhi, Ma Hong, Fan Guozhang Major achievements of CNPC overseas oil and gas exploration during the 13th Five-Year Plan and prospects for the future China Petroleum Exploration    2020, 25 (4): 1-10.   DOI: 10.3969/j.issn.1672-7703.2020.04.001 Abstract （1908）   HTML    PDF （1008KB）（36）    Knowledge map    Save During the period of the 13th Five-Year Plan, oil prices have remained continuously low and the global investment environment has become increasingly complicated. This has raised major issues for CNPC overseas oil and gas exploration, including the issue of how to adapt to complex internal and external environments as quickly as possible and how to achieve accurate deployment and benefit exploration. The company has proposed a robust deployment strategy of focusing on benefits, seeking large-scale, high-quality, rapidly-recoverable reserves, and carrying out risk exploration and fine exploration. A series of effective exploration management measures have gradually been developed. These include: innovating and implementing an integrated research organization mode of “industry-college-institute-application cooperation”, optimizing decision-making processes at headquarters level, integrating exploration-development-engineering, strengthening international cooperation in deep-water exploration, and screening large basins globally to identify new exploration projects. Between 2016 and 2019, CNPC overseas oil and gas exploration made 12 major breakthroughs and strategic discoveries as a result of implementation of these measures. Discoveries have been made in several fields in mature exploration areas through fine exploration. Cumulative proven oil and gas geological reserves are more than 10×108 t oil equivalent, the discovery cost per barrel oil is less than $2/bbl, and the average success rate of exploration wells is 76%. At present, CNPC overseas oil and gas exploration still faces challenges such as continuously low international oil prices, a sharp decrease in exploration projects, increasingly fierce competition for new blocks, the inferior quality of conventional oil and gas resources, and increasingly complex exploration objects. The company also has comparatively weak capacity for independent exploration and development of deep-water oil and gas. However, There are still rich undiscovered oil and gas resources around the world. Cross-border integration of advanced technologies will transform exploration concepts and technological innovations, so the prospects for overseas oil and gas exploration are broad and promising. Reference | Related Articles | Metrics Select Li Zhi, Ji Zhifeng, Li Fuheng, Yang Zi, Ma Hong, Wang Lin Research and application of a comprehensive evaluation index system for overseas prospects China Petroleum Exploration    2020, 25 (4): 11-21.   DOI: 10.3969/j.issn.1672-7703.2020.04.002 Abstract （825）   HTML    PDF （1721KB）（670）    Knowledge map    Save Since the second half of 2014, the international oil price has been hovering at a low level. In these circumstances, the primary issues faced by oil companies are how to make exploration deployment plans under conditions of variable oil prices, and how to achieve benefit exploration. Based on investigation of the comprehensive evaluation methods of prospects at home and abroad, combined with the practices of the overseas oil and gas exploration of CNPC, a comprehensive evaluation and ranking method has been proposed for exploration prospects based on geological risk, economic value, resource exploitability, and strategic factors affecting the prospects. Eleven indices of these four aspects have been weighted for quantitative evaluation. Based on the establishment of a comprehensive evaluation index, a three-step evaluation procedure is proposed: candidate collection, preliminary screening, and comprehensive ranking. This approach supports multi-prospect ranking and deployment optimization under a variety of oil prices. Since 2016, CNPC overseas oil and gas exploration has applied this evaluation index system and procedures to carry out two rounds of comprehensive ranking and deployment optimization for global prospects every year, and to put forward differentiated deployment plans. The application effect has been remarkable, showing that the evaluation index system is of considerable value in promoting effective exploration. Reference | Related Articles | Metrics Select Tian Lixin, Shi Hesheng, Liu Jie, Zhang Xiangtao, Liu Jun, Dai Yiding A major discovery and the significance of new frontier exploration in the Huizhou sag, Pearl River Mouth Basin China Petroleum Exploration    2020, 25 (4): 22-30.   DOI: 10.3969/j.issn.1672-7703.2020.04.003 Abstract （1104）   HTML    PDF （5510KB）（16）    Knowledge map    Save The Huizhou sag in the Pearl River Mouth Basin is the ‘cradle’ of the petroleum industry in the eastern South China Sea, and also the breakthrough area for oil and gas discoveries in the middle-deep Paleogene in the eastern Pearl River Mouth Basin. For the past 10 years, however, exploration in the Huizhou sag has been trapped in a bottleneck. In order to discover new large-medium oil and gas fields, it is necessary to hold workshops and strengthen the re-evaluation work of petroleum geological conditions to bolster confidence in the exploration idea of “new achievements in mature areas”. Now, a new exploration concept is now proposed: “taking oil-rich sub-sags as a basis, focusing on Paleogene-buried hills, and expanding to new frontiers”. With increased research, new understandings of gas exploration in oil-rich sub-sags are emerging. In the Huizhou 26 sub-sag, mixed-type kerogens of lacustrine facies are characterized by “generation of both oil and gas, and rapid gas generation in the late stage” and offer great potential for natural gas resources. The “Paleogene-buried hills” trap group around the Huizhou 26 sub-sag has a hydrocarbon accumulation model of “strong near-source hydrocarbon supply and stereoscopic network migration”, making it the preferred zone for exploration transformation and new-field breakthroughs. The recent breakthrough discovery of a large-medium oil and gas field in the “Paleogene-buried hill” area of the Huizhou 26-6 structure—confirms this new target of gas exploration in high mature oil-rich sub-sag, opens a new chapter of “Paleogene-buried hill” exploration in the Huizhou sag, and expands the new exploration field of paleo-buried hills in the eastern Pearl River Mouth Basin. Reference | Related Articles | Metrics Select Zhang Guangya, Yu Zhaohua, Huang Tongfei, Cheng Dingsheng, Chen Zhongmin, Chen Xi, Liu Hong, Song Chengpeng Types of rift basins in Africa and their hydrocarbon accumulation characteristics China Petroleum Exploration    2020, 25 (4): 43-51.   DOI: 10.3969/j.issn.1672-7703.2020.04.005 Abstract （974）   HTML    PDF （1232KB）（55）    Knowledge map    Save Rift basins in Africa are of many types, are in many stages of geological development, and often possess rich oil and gas resources. In order to guide oil and gas exploration and strategic selection of favorable areas, this study analyzes the types and formation stages of rift basins in Africa. The hydrocarbon accumulation characteristics of a number of key rift basins are also described. The results show that: (1) there are three principal stages of rift basins in Africa: Paleozoic, Mesozoic, and Cenozoic. A number of rift systems are formed: the Karoo rift system, the intracontinental rift system in West and Central Africa, the continental margin rift system in North Africa, and the Red Sea-Gulf of Aden-East African rift system. Prototype basins can be divided into active rift basins and passive rift basins according to genesis type. Active basins are related to thermal-uplift and tension and passive basins are related to strike slip or regional extensional stress fields. Basins can be divided into intracontinental rift basins, intercontinental rift basins, aulacogen rift basins, and continental margin rift basins according to structural position and basement characteristics. (2) The basins have different petroleum geological characteristics and hydrocarbon enrichment laws as a result of variations in tectonic evolution, sedimentary filling, and structure. In North Africa, high-quality marine source rocks are developed in continental margin rift basins. The dominant petroleum system is a Mesozoic-Cenozoic system. Oil and gas are primarily accumulated in faulted horst areas formed by differential subsidence. In Central and West Africa, multi-stage superimposed rifts are developed in intracontinental rift basins with a variety of major plays. Oil and gas are distributed in Paleogene, Upper Cretaceous, and Lower Cretaceous formations. In East Africa, intracontinental rift basins formed late and are dominated by a Cenozoic petroleum system. Reference | Related Articles | Metrics Select Zhao Jian, Zhang Guangya, Liu Aixiang, Ke Weili, Shi Yanli, Zou Quan, Cheng Dingsheng, Zheng Yonglin, Yu Yongjun Development characteristics and exploration significance of basement reservoirs in block-6 of the Muglad Basin, Sudan China Petroleum Exploration    2020, 25 (4): 133-142.   DOI: 10.3969/j.issn.1672-7703.2020.04.014 Abstract （548）   HTML    PDF （14103KB）（6）    Knowledge map    Save Basement exploration in the Muglad Basin in Sudan has attracted a lot of attention following recent breakthroughs in the exploration of basement buried hill in several adjacent basins. This study analyzes the basement lithology and reservoir development characteristics in the basin and considers its significance as an exploration target. Analysis is based on exploration practice, using drilling, well logging, testing, and 3D seismic data from block-6 of the basin. The basement rock is composed of feldspar, quartz, hornblende, and mica. The protolith is felsic granite or granodiorite, which experienced varying degrees of regional metamorphism or dynamic metamorphism, so that the basement rocks are metamorphic rocks of low to intermediate metamorphism. Basement reservoirs in the study area have double-layer structures: shallow layers of weathering crust and middle- deep layers primarily composed of fracture zones. The weathering crusts are usually of small thickness (less than 50 m) and are mostly developed on the surfaces of uplifts (bulges). Weathering and leaching have resulted in widespread broken rocks and dissolved minerals, with vugs developed. The fracture zones are generally thick, but distribution is uneven. It is evident in the basin margin and in the transition zone between depression and uplift that fracture zones form the principal reservoir type in the basin basement. Fracture development areas such as the steep-slope zones at the edge of petroleum-rich depressions (or sags) and depression-uplift transition zones should be priority targets for basement exploration in the future. Reference | Related Articles | Metrics Select Li Luguang, He Haiqing, Fan Tuzhi, Liu Henian, Yang Tao, Wan Lunkun, Huang Fuxi, Li Zhi Oil and Gas Exploration Progress and Upstream Development Strategy of CNPC China Petroleum Exploration    2020, 25 (1): 1-10.   DOI: 10.3969/j.issn.1672-7703.2020.01.001 Abstract （2362）   HTML    PDF （3561KB）（26）    Knowledge map    Save In recent years, the China National Petroleum Corporation (hereinafter referred to as CNPC) has made 13 major breakthroughs and new strategic discoveries and formed 10 large hydrocarbon provinces with reserves of over 100 million tons by following the principle of efficient exploration relying on domestic and expanding overseas markets. . Based on important domestic and foreign exploration progress since the beginning of the ‘13th Five-Year Plan’ period, and in view of the current situation and requirements at home and abroad, comprehensive analysis of the oil and gas resources situation in the CNPC mining rights blocks, the development potential of remaining resources and the challenges faced by the upstream business has been carried out. This has also clarified the general train of thought and strategic targets of CNPC's upstream business for the future: CNPC will adhere to steady development guidelines and high-quality development goals, and will implement strategies to find more oil and gas resources, the domestic upstream segment will reinforce exploration and development by focusing on the seven major basins, paying equal attention to oil and gas resources, and putting conventional and unconventional resources on an equal footing, the strategic target is to achieve annual newly increased proven petroleum geological reserves of more than 1.1 billion tons of oil equivalent in the period from 2019 to 2025, and to achieve oil and gas production of 220 million tons of oil equivalent by 2025; In overseas markets, CNPC will focus on conventional oil and gas resources, optimize the development of five cooperation zones (Central Asia-Russia, the Middle East, Africa, the Americas, and Asia-Pacific) and expand the scale of ‘Belt and Road’ cooperation. Five measures have been proposed to ensure the realization of these strategic targets, which include reinforcement of domestic exploration and development, implementation of high-quality and efficient development overseas, promotion of scientific and technological innovation, deepening of reform and management innovation, and strengthening of the fostering of high quality talent teams specializing in petroleum exploration and development. Reference | Related Articles | Metrics Select Guo Jiaofeng, Wang Jie, Meng Fanda Promoting the high-quality development of China’s shale oil upstream industry by following international first-class standard China Petroleum Exploration    2019, 24 (5): 547-552.   DOI: 10.3969/j.issn.1672-7703.2019.05.001 Abstract （1259）   HTML    PDF （327KB）（28）    Knowledge map    Save The United States energy independence is in stark contrast to China’s rising dependence on foreign resources. The international petroleum order-rebuilding and the China–US game have brought greater uncertainties to China’s oil and gas supply, and China’s energy security issues are increasingly prominent. China’s shale oil reserves rank the third in the world and present an important strategic alternative resource for China’s petroleum industry. To vigorously develop shale oil and promote China’s “shale revolution” is essential for ensuring the national energy security in an open climate. However, the shale oil upstream industry in China faces a lot of problems, such as low exploration quality, low recovery efficiency and imperfect policy system. In order to promote the high-quality development of the industry, China should learn from the US “shale revolution”. Specifically, China should focus on “three revolutions”: (1) the revolution of exploration quality, by performing the nationwide shale oil resource evaluation; (2) the revolution of technology and recovery efficiency, by devoting more efforts to key technologies of exploration and development; and (3) the revolution of system/mechanism, by accelerating the market-oriented reform of exploration and development. Reference | Related Articles | Metrics Select Yang Lei, Jin Zhijun Global shale oil development and prospects China Petroleum Exploration    2019, 24 (5): 553-559.   DOI: 10.3969/j.issn.1672-7703.2019.05.002 Abstract （2252）   HTML    PDF （455KB）（557）    Knowledge map    Save The development of global shale oil is an important reference to the development of shale oil in China. After systematically collecting data and researching, and analyzing the development history and key points of US shale oil, including the development process, how to reduce cost and increase production, technologies, development models, economics, and supporting policies, it is found that the development model of shale oil is different from conventional energy, and it is more dependent on technological progress, cost reduction and financial support, and similar to new energy development models to some extent, so development in the stage early needs more supports. The explosive increase of shale oil in the United States is driven by breakthroughs in geological theory and advances in development technologies. The most important is the rapid reduction of the cost for developing shale oil. This not only thanks to technological advances, but also is the result of innovative business models. The global shale oil resources are abundant, and many countries and regions, such as North America, Argentina, Russia, and China, all had good start. In the future, global shale oil production will continue to grow and is expected to exceed 1000×104bbl/d after 2025. According to the characteristics of shale oil in China, shale oil would be strategic successive resources in China. To increase investment in science and technology research and development, give supporting policies, and create favorable conditions to attract more investment will ensure the large-scale development of shale oil during the 14th Five-Year Plan. Reference | Related Articles | Metrics Select Zhou Lihong, Wang Xin, Fu Lixin, Wu Xuesong, Li Hongjun, Lou Da, Duan Runmei, Cui Yu, Wang Hui Discovery and geological significance of the Permian sandstone condensate gas reservoir in Wumaying buried hill, Huanghua depression China Petroleum Exploration    2019, 24 (4): 431-438.   DOI: 10.3969/j.issn.1672-7703.2019.04.003 Abstract （917）   HTML    PDF （34283KB）（450）    Knowledge map    Save The Permian sandstone in the Wumaying buried hill in Huanghua depression showed high-yield oil and gas flows and good exploration prospects in the Upper Paleozoic. According to the analysis to the characteristics of the coal-bearing source rocks, reservoirs, traps and hydrocarbon accumulation in the Upper Paleozoic formations, dominant reservoir conditions and the geological significance of the Permian sandstone condensate gas reservoir were clarified in Huanghua depression. Our study shows that: (1) the Carboniferous-Permian coal-bearing strata have stable distribution, large hydrocarbon generating potentials and highly thermal evolution, which provide sufficient hydrocarbon sources; (2) the thick Permian lower Shihezi Formation sandstone reservoirs remain higher porosity even after deeply buried, which provide good space for accumulating hydrocarbon; (3) the thrust nappe structures include several large anticlines and faulted noses, which are favorable space for storing hydrocarbon; (4) the faulting activities tended to stop when the neotectonic movement took place in the Wumaying buried hill, so it is conducive to preserving hydrocarbon reservoirs. The discovery of the Permian sandstone condensate gas reservoir confirmed the huge hydrocarbon generating potential of the Carboniferous-Permian coal-bearing source rocks, pointed out key exploration targets in the Permian lower Shihezi Formation, extended effective exploration to the Paleozoic sandstone reservoir at 5000 m, and greatly expanded the exploration scope inside the buried hill in the Huanghua depression. Reference | Related Articles | Metrics Select Wu Saijun, Wei Guoqi, Yang Wei, Duan Shufu, Jin Hui, Xie Wuren, Wang Minglei, Wang Kun, Su Nan, Ma Shiyu, Hao Cuiguo, Wang Xiaodan Development characteristics of reefs on the platform margin of Changxing Formation in eastern Kaijiang-Liangping ocean trough and its significance for petroleum geological exploration China Petroleum Exploration    2019, 24 (4): 457-465.   DOI: 10.3969/j.issn.1672-7703.2019.04.006 Abstract （890）   HTML    PDF （3388KB）（600）    Knowledge map    Save Several giant gas fields (Puguang, Huanglongchang, etc.) have been found in eastern Kaijiang-Liangping ocean trough, Sichuan Basin, which is an important exploration domain of reef beach. In order to further clarify the development characteristics of platform margin reefs in the Changxing Formation in the eastern side of the ocean trough, based on drilling and seismic data, the development characteristics of platform margin belt and platform margin reefs on the eastern side of the trough were studied on the basis of the external outline, internal shape and plane distribution of platform margin reefs. The study results indicate: (1) According to slope angle difference, the platform margin in the eastern Kaijiang-Liangping ocean trough can be divided into steep slope type and gentle slope type. (2) It has sectional feature on plane. (3) There are two development patterns (retrogradation pattern in gentle slope, superposition pattern in steep slope), and the retrogradation pattern in gentle slope is the dominant. (4) The development of platform margin reefs is mainly controlled by sea level change, multiple-level synsedimentary faults and regional tension. (5) The reef development on the gentle slope platform margin experienced four evolution stages: micro-palaeogeomorphic formation stage (Wujiaping), gentle slope beach development stage (Chang 1 stage), weak rimmed platform margin reef beach development stage (early Chang 2 stage), multi-row reef beach development stage on rimmed platform margin (middle Chang 2-Chang 3 stage). The multi-row reefs in the gentle slope of the Changxing Formation in the eastern Kaijiang-Liangping ocean trough have wide distribution area and favorable hydrocarbon accumulation conditions. It is an important area for natural gas exploration. Reference | Related Articles | Metrics Select Li Jian, She Yuanqi, Gao Yang, Yang Guiru, Li Mingpeng, Yang Shen Onshore deep and ultra-deep natural gas exploration fields and potentials in China China Petroleum Exploration    2019, 24 (4): 403-417.   DOI: 10.3969/j.issn.1672-7703.2019.04.001 Abstract （1468）   HTML    PDF （3014KB）（866）    Knowledge map    Save In order to further clarify the natural gas exploration potentials and distribution of favorable targets, analyze the outstanding problems and improve the exploration theories in onshore deep and ultra-deep formations in China, the exploration progresses and resources were reviewed, the geology, key factors on reservoir formation and potentials of natural gas resources were classified and evaluated. Our study shows that: (1) 10 foreland thrust belts and slopes (i.e. Kuqa, West Sichuan, South Junggar, etc.) developed in the piedmont zones of the superimposed basins in mid-western China are key exploration zones in foreland thrust belts; (2) the paleo-uplifts and slopes, intracratonic rifts and platform margin reef beaches in the Ordos Basin, Sichuan Basin and Tarim Basin developed on three major cratons (North China, Yangtze and Tarim) are important deep and ultra-deep marine carbonate rock zones; (3) the deep paleo-uplifts, slopes and bedrock buried hills in the Songliao Basin and the Bohai Bay Basin are deep and ultra-deep targets in Mesozoic-Cenozoic rifted basins; and (4) others like deep and ultradeep volcanic rocks are future exploration targets. More problems should be solved, and more basic researches should be conducted related to exploration of deep and ultra-deep natural gas in China. Reference | Related Articles | Metrics Select Fu Jinhua, Fan Liyong, Liu Xinshe, Hu Xinyou, Li Jihong, Ji Haikun New progresses, prospects and countermeasures of natural gas exploration in the Ordos Basin China Petroleum Exploration    2019, 24 (4): 418-430.   DOI: 10.3969/j.issn.1672-7703.2019.04.002 Abstract （1414）   HTML    PDF （3519KB）（794）    Knowledge map    Save The Ordos Basin has always been one of the key oil & gas exploration and development areas in China. And in the Ordos Basin, some important oil and gas fields have been discovered. As the exploration continues, the exploration objects turn to the areas with complex hydrocarbon accumulation conditions, e.g. tight zones, deep zones and basin peripheries, and the difficulty in searching for new large-scale monoblock reserves increases. The Changqing Oilfield Company’s new cognitions and progresses in the fields of tight sandstone gas and marine carbonate gas in recent years were summarized systematically, and the main geological characteristics and control factors of different types of gas reservoirs in the Ordos Basin were analyzed. Then, based on the distribution situations of oil and gas resources and the basic characteristics of newly discovered gas reservoirs, the “two-step” development strategy of Changqing Oilfield Company was put forward scientifically. In addition, the future exploration replacement fields of carbonate gas, tight sandstone gas and unconventional natural gas (tight sandstone gas excluded) were pointed out. Finally, in view of the problems in the process of exploration and development, the corresponding countermeasures were formulated systematically by combining with production practice closely. In this way, the geologic researches are strengthened, the working concept is transformed actively, the technical researches were reinforced and the exploration-development integration and the geology-engineering integration are promoted so as to realize the large-scale efficient exploration and development of natural gas and provide the experience and reference for the exploration and development of similar basins. Reference | Related Articles | Metrics Select Zhao Dijiang, Guo Yonghua, Qiao Zhu, Chen Xinlu, Kong Shuanshuan Application of high-precision hydrocarbon migration simulation technology in BZ 19-6 oil and gas field and its surrounding area China Petroleum Exploration    2019, 24 (4): 520-531.   DOI: 10.3969/j.issn.1672-7703.2019.04.012 Abstract （831）   HTML    PDF （8345KB）（710）    Knowledge map    Save The 3D geological model established using existing hydrocarbon migration simulation software cannot reflect the spatial superimposition relationships of sandstone and mudstone, so it is hard to accurately and effectively simulate actual hydrocarbon migration process. Taking BZ 19-6 oil and gas field and its surrounding area in Bohai Sea as a case, a 3D geological model was established from individual wells and constrained by seismic attributes, and then the mudstone percent of the source fault was calculated and taken as the quantitative evaluation standard of fault transporting capacity, and finally 3D hydrocarbon migration was simulated. It is concluded that deep hydrocarbon accumulation is mainly under the joint control of sandstone and geomorphically low-potential zones, and middle and shallow hydrocarbon accumulation is affected by fault activity and mudstone percent of fault plane. The high-precision hydrocarbon migration simulation successfully reproduced the process of hydrocarbon accumulation in BZ 19-6 structure and presents good application prospect. Reference | Related Articles | Metrics Select Chen Yang, Zhang Yang, Zhu Zhengjie, Zhang Ruigang, Li Lianglin, Chen Wei, Liu Peng Early sedimentary sequence and petroleum geological significance of faulted basins: a case study on the lower Es 4 in Bonan sag, Jiyang depression China Petroleum Exploration    2019, 24 (3): 313-322.   DOI: 10.3969/j.issn.1672-7703.2019.03.004 Abstract （743）   HTML    PDF （3026KB）（429）    Knowledge map    Save The exploration practice in recent years shows that not only sedimentary facies exist in the oxidized environment but also in the semi-reduced and reduced environment in the early stage of the faulted basin. In order to find out the relatively complete sedimentary sequence and its petroleum geological significance in the early stage of the faulted basin, taking the lower Es 4 (the fourth member of Shahejie Formation) in Bonan sag as an example, comprehensive analysis has been carried out on drilling, logging and experimental data. The results show that in the early stage of the faulted basin, in addition to the alluvial fan and the braided river understood traditionally, river delta, fan delta and lake were deposited. Original sedimentary boundary restoration and sedimentary center analysis indicate that the primary direction of the alluvial fan and the braided river in the lower Es 4 is NNE; the braided river delta formed by the braided river into the lake is in the NW banded lake basin; and under the control of the "source-sink" system, a relatively complete sedimentary sequence of alluvial fan-braided river-braided river delta-lake could be developed in the early stage of the faulted basin. The re-understanding of the alluvial-lake sedimentary system not only makes the originally "barren" red layer have a certain potential for hydrocarbon generation, and the newly identified braided river delta may provide favorable reservoirs and traps, thus expanding the exploration space of the "red layer". Reference | Related Articles | Metrics Select Peng Guangrong, Zhang Xiangtao, Xu Xinming, Bai Haijun, Cai Guofu, Zhao Chao, Zhang Zhiwei Important discoveries and understandings of oil and gas exploration in Yangjiang sag of the Pearl River Mouth Basin, northern South China Sea China Petroleum Exploration    2019, 24 (3): 267-279.   DOI: 10.3969/j.issn.1672-7703.2019.03.001 Abstract （1374）   HTML    PDF （3874KB）（492）    Knowledge map    Save The exploration based on foreign cooperation has been carried out many rounds in Yangjiang sag of the Pearl River Mouth Basin, but only a few oil and gas shows are discovered and no commercial oil and gas discovery is achieved. Recently, the petroleum geological conditions in Yangjiang East sag were analyzed systematically based on a great amount of new drilling, geochemical and seismic data. It is indicated that Yangjiang East sag can be divided into 4 subsags, including Yangjiang 24 subsag, Enping 19 subsag, Enping 20 subsag and Enping 21 subsag. There are 3 kinds of subsag structures, including composite half graben, double-fault graben and single half graben. In Paleogene Wenchang Formation, the intrabasinal middle-and small-sized provenances are dominant and the source rocks of semi-deep lake facies are widely developed. Among them, Enping 20 subsag has the earliest and longest subsag controlling faulting activity and generates Wenchang Formation which is complete and vertically superimposed stably. It is favorable for the formation of high-abundance source rocks of semi-deep lake facies to provide the rich hydrocarbon generation potential. By using the fluid detection technique, combined with the new understandings on source-fault controlled reservoir, Enping 20 structural belt of faulted anticline was selected to deploy Well Y10-1 preferentially. Owing to its deployment, a middle-sized oil field is discovered with daily industrial oil production over 1000 m 3 during the testing, which means the important breakthrough of oil and gas exploration in Yangjiang sag and displays the promising exploration prospect in this area. In conclusion, the exploration discovery in Yangjiang sag opens up a new oil area in the Pearl River Mouth Basin, and the keys to the breakthrough of large- and middle-sized oil and gas fields in the new areas are focusing on the detailed information, enhancing the basic researches and standing on the value exploration. Reference | Related Articles | Metrics Select Zhang Kang, Zhang Liqin The analysis on the composition changes of China's crude oil reserves and production in early 21 th century and its enlightenment China Petroleum Exploration    2019, 24 (3): 280-296.   DOI: 10.3969/j.issn.1672-7703.2019.03.002 Abstract （1063）   HTML    PDF （2508KB）（601）    Knowledge map    Save For a deeper understanding of China's oil production situation, it is necessary to investigate the composition of the reserves-production system and its changes, especially the proved developed estimated ultimate recovery (Proved Development EUR) and the corresponding Proved Developed Reserves and production in large oil fields or basins. The study results indicate that China has almost achieved the goal of the second round of oil and gas exploration, and the Proved Developed Reserves and production began declining. To keep sustainable and stable production, it is necessary to tap the potential of old oilfields, and more importantly, to find strategic replacement in new areas. Such new areas include deep strata in large basins, offshore Pre-Cenozoic marine strata, the Tibetan Plateau, and the Upper Paleozoic of the "Southern Intercontinental Zone of Central Asia" in northern China. In addition to technical challenges, oil and gas exploration and production are currently suffering the impacts from insufficient investment and slow progress in institutional reforms. Reference | Related Articles | Metrics Select Zhang Yiming, Tian Jianzhang, Yang Dexiang, Han Hongtao, Chen Shuguang, Tian Ran, Wang Xufeng, Zhang Jianli Accumulation conditions and exploration direction of Cambrian Fujunshan Formation inside buried hills in Jizhong depression China Petroleum Exploration    2019, 24 (3): 297-312.   DOI: 10.3969/j.issn.1672-7703.2019.03.003 Abstract （911）   HTML    PDF （4367KB）（641）    Knowledge map    Save Cambrian Fujunshan Formation inside the buried hills in Jizhong depression was investigated to the structure, lithofacies palaeogeography, reservoirs, caprocks, hydrocarbon sources and traps using drilling, seismic, well test and laboratory data. The study results show that Cambrian Fujunshan Formation includes good dolomite reservoirs, and two sections of stable and effective caprocks (Cambrian Mantou Formation and Xuzhuang Formation; Qingbaikou mudstone), which constitute the most favorable reservoir-caprock-isolator assemblage; There are five types of hydrocarbon transport systems:vertical hydrocarbon migration from deep source along faults, lateral hydrocarbon migration from near source along faults, hydrocarbon migration inside source along unconformity, hydrocarbon migration along faults and unconformity, and step-like hydrocarbon migration along fault and effective reservoir; 4 types of traps developed:layered fault trap, bedding unconformity slope trap, adverse unconformity slope trap, and fault-unconformity trap. It is concluded that favorable reservoir-transport system-caprock configuration (isolator) is a key factor for hydrocarbon accumulation inside buried hills. Finally, 3 class I and 2 class Ⅱ exploration zone are proposed, and several buried hill belts are selected for future exploration, including Hexiwu buried hill belt, Wen'an slope west buried hill belt, Nanmazhuang buried hill belt and Changyangdian buried hill belt. Reference | Related Articles | Metrics Select Guo Tao, Li Zhuqiang, Hu Jiashan, Lin Zhimo, Yin Kemin, Feng Guozhi, Wei Min Study on geological structure of the Dunhuang Basin based on gravity and electric data China Petroleum Exploration    2019, 24 (3): 369-376.   DOI: 10.3969/j.issn.1672-7703.2019.03.010 Abstract （730）   HTML    PDF （41158KB）（502）    Knowledge map    Save The Dunhuang Basin is generally superimposed on Dunhuang block in the eastern part of Tarim plate. So far, it has been less explored and investigated. Understanding the basin structure, including fault distribution, structural pattern and basement depth, can provide a geological basis for further comprehensive study on exploration. Based on the physical properties of outcrops, drilling/logging results and other geological data, the variations of rock, formation density and electrical properties were identified. The layered model was combined with the continuation technique to eliminate electric distortion caused by terrains, thus deriving more accurate electromagetic inversion results. The gravity linear-gradient zones were extracted from gravity data using the total horizontal gradient technique to enhance the linear characteristics of faults within the basin. The basement depth was analyzed with the Parker inversion method. The results show that:in the Dunhuang Basin, there are three sets of density and electrical layers. The regional faults control the structural pattern of alternate uplifts and sags. And Wudun sag has the deepest basement, which is the most favorable depocenter. Reference | Related Articles | Metrics Select He Haiqing, Zhi Dongming, Lei Dewen, Yang Disheng, Xiao Lixin, Yuan Bo, Qi Xuefeng, Zhao Jinyong Strategic breakthrough in Gaoquan anticline and exploration assessment on lower assemblage in the southern margin of Junggar Basin China Petroleum Exploration    2019, 24 (2): 137-146.   DOI: 10.3969/j.issn.1672-7703.2019.02.001 Abstract （1339）   HTML    PDF （15879KB）（478）    Knowledge map    Save The southern margin of the Junggar Basin is a strategic successor for oil and gas exploration, and the strategic breakthrough in exploration well Gao 1 further proved the promising future of the lower assemblage in the southern margin. According to the results of sectional structural modeling, structural analysis of the trap and the matching between accumulation conditions, the controlling factors of hydrocarbon accumulation in the lower assemblage was identified. The study results indicate (1) the lower Jurassic is primary source rock which has a large potential; the Cretaceous Qingshuihe Formation, Jurassic Toutunhe Formation and Khalza Formation are effective reservoirs with a certain scale; and the regional thick mudstone of the Cretaceous Tugulu Group at higher pressure is effective caprock with good sealing ability; (2) static elements (i.e. source, reservoir and cap rocks and traps) matched well in space, and dynamic elements matched well in time:the traps developed earlier, the forming of the structure was well consistent with the generating of hydrocarbon, later reconstruction was weak and the preservation conditions were good, which are good conditions for large-scale accumulation. Base on the comprehensive analysis above,near-source anticlinal traps, such as the Tugulu anticline, the Hutubi anticline and the Dongwan anticline, are proposed to make breakthrough to gas exploration in the southern margin of the Junggar Basin. Reference | Related Articles | Metrics Select Li Guoxin, Wang Feng, Pi Xuejun, Liu He Optimized application of geology-engineering integration data of unconventional oil and gas reservoirs China Petroleum Exploration    2019, 24 (2): 147-152.   DOI: 10.3969/j.issn.1672-7703.2019.02.002 Abstract （1529）   HTML    PDF （12158KB）（518）    Knowledge map    Save Geology-engineering integration is widely recognized as an effective process in the exploration and development of unconventional oil and gas reservoirs. It involves massive data of various disciplines including geology, reservoir, geophysical exploration, drilling, mud logging, well logging, well test, production test, production and downhole operations. Since professional personnel/organizations have different understandings and requirements for specific data, the data systems can hardly be connected and interacted among disciplines, which may form "data islands". Based on the system platforms of data lake and knowledge database for the life cycle of reservoirs, the core data of geology and engineering are selected and the core "gold data" of exploration and development are identified to realize convenient and efficient communication and interactive optimization of professional data. In this way, the geology-engineering data can be integrated to greatly improve the efficiency and accuracy of data utilization. For purpose of effective geology-engineering integration, an integrated project organization and management framework is proposed, and the decision-making, coordination and information feedback mechanisms are established. Moreover, more sophisticated technology management is implemented, and key links in production arrangement and implementation are optimized. Thus, the best economic benefits can be expected. Reference | Related Articles | Metrics Select Zhou Xinhuai, Gao Shunli, Gao Weizhong, Li Ning Formation and distribution of marine-continental transitional lithologic reservoirs in Pingbei slope belt, Xihu sag, East China Sea Shelf Basin China Petroleum Exploration    2019, 24 (2): 153-164.   DOI: 10.3969/j.issn.1672-7703.2019.02.003 Abstract （846）   HTML    PDF （19238KB）（478）    Knowledge map    Save With the deepening geological knowledge and the advancing exploration techniques, the exploration in Pingbei slope belt, Xihu sag of the East China Sea Shelf Basin, is shifting from structural reservoirs to lithologic reservoirs. According to the systematic analysis of transitional deposits, Pingbei slope belt is believed having four sequence stratigraphic styles, i.e., fault-slope, opposite fault terrace, antithetic fault terrace, and concordant fault terrace, which correspond to four types of sandstone reservoirs (fault-slope tide-dominated delta tidal channel, opposite fault terrace tide-dominated delta front tidal flat, antithetic fault terrace river-dominated delta front channel, and concordant fault terrace river-dominated delta front channel). Based on the sand body distribution and hydrocarbon accumulation models predicted, the formation conditions and distribution rules of lithologic reservoirs in different plays of Pingbei slope belt were identified. It is finally indicated that the sandstone reservoir of fault-slope tide-dominated delta tidal channel in Tuanjieting area and the sandstone of concordant fault terrace river-dominated delta front channel in Qongqueting area are primary exploration targets. Following the model of lithologic reservoirs, significant breakthrough has been made during drilling lithologic traps in Block Ningbo 19 controlled by Baoyunting low uplift and the antithetic fault terrace belt. Reference | Related Articles | Metrics Select Tian Jun, Liu Hongtao, Teng Xueqing, Cai Zhenzhong, Zhang Hui, Cao Lihu Geology-engineering integration practices throughout well lifecycle in ultra-deep complex gas reservoirs of Kelasu tectonic belt, Tarim Basin China Petroleum Exploration    2019, 24 (2): 165-173.   DOI: 10.3969/j.issn.1672-7703.2019.02.004 Abstract （1127）   HTML    PDF （14203KB）（511）    Knowledge map    Save The gas-rich Kelasu structural belt is the primary option for increasing reserves and production in the Tarim Basin. The geological and engineering conditions in the belt are extremely complex as a result of strong orogenic movements, represented by deep burial (VD 7000-8000 m), high temperature (130-190℃), high pressure (116-136 MPa), high in-situ stress (130-180 MPa), low porosity (4%-8%), low permeability (0.01-0.1 mD), thick gravel (5500 m), thick salt-gypsum (4500 m), and large dip angle (87°). These factors bring great challenges to the safe and economical exploration and development. In order to get fast drilling and production, guided by the geology-engineering integration, the multi-disciplinary research team worked in an innovative and integrated manner to figure out the solutions to ultra-deep complex gas reservoir development with higher rate, productivity and quality. By combining precise prediction of key zones, customized design of drill bit and oil-based drilling fluid system, the all sections were drilled in a safe and rapid mode. According to sweet spots prediction, fracture evaluation and classification, an optimal fracturing stimulation process was established based on fracturability of natural fractures. Considering formation and fluid properties and working conditions, a system barrier was designed for ensuring wellbore integrity. By virtue of improving geology-engineering integration practices, the drilling period of an ultra-deep well reduced from 336 days during the 12th Five-Year Plan period to 277 days in 2017, the average single-well productivity increased by 4-5 times, and the well integrity was improved. Thus, the geology-engineering integration is a technical guarantee for safe and economical development of ultra-deep complex gas reservoirs in the Kelasu structural belt. Reference | Related Articles | Metrics Select Xie Jun, Xian Chenggang, Wu Jianfa, Zhao Chunduan Optimal key elements of geoengineering integration in Changning National Shale Gas Demonstration Zone China Petroleum Exploration    2019, 24 (2): 174-185.   DOI: 10.3969/j.issn.1672-7703.2019.02.005 Abstract （1378）   HTML    PDF （18453KB）（591）    Knowledge map    Save The Changning National Shale Gas Demonstration Zone is a representative case in China's shale gas industry. Its development has transited from the engineering exploration and practice initially to the comprehensive geoengineering integration in the third stage. For purpose of "single-well production increase and overall efficiency improvement", it is necessary to make full use of various geological and engineering data to systematically study four optimal key elements:horizontal well box, fracturing stimulation, production system and development technology, aiming to continuously increasing production from single well to full gas field, and improving the estimated ultimate recovery (EUR) and economic indicators. A 3D shared geoscience model based on geoengineering integration can perform system analysis and evaluation of project implementation effects by multidisciplinary and multi-parameter data analysis, multi-field coupled simulation on stress-sensitive shale (including geomechanics, modeling hydraulic fracture network and gas reservoir numerical simulation) and full gas field numerical simulation. By comparing multiple programs under current technical conditions, optimal box position and production system have been defined. Also, fracturing parameters and process, well location and spacing have been established. In order to achieve overall optimization, it is proposed that geoengineering integration should transform from well-based integration of drilling, completion fracturing and production to full gas field-based development project. As a response, numerical simulation to stress-sensitive shale was carried out on full gas field for the first time at home and abroad. Reference | Related Articles | Metrics Select Jin Chengzhi, He Jian, Lin Qingxiang, Mei Jian, Duan Yanqing Fracturing stimulation based on geology-engineering integration to tight oil reservoirs in Block Fang 198-133, northern Songliao Basin China Petroleum Exploration    2019, 24 (2): 218-225.   DOI: 10.3969/j.issn.1672-7703.2019.02.010 Abstract （992）   HTML    PDF （12822KB）（710）    Knowledge map    Save Tight oil reservoirs are widely distributed and have a huge resource potential in the Daqing oilfield. For effective development of such tight oil reservoirs, the fracturing stimulation based on geology-engineering integration was proposed. Specifically, the pad-based fracturing scheme was optimized to combine geologic, drilling and fracturing data with operation procedures, maximizing the stimulated reservoir volume. Following an intensive factory-like operation mode, the number of field staff was reduced to 26, and the covering area was saved by 77%. With one package of fracturing truck, the fracturing operation was completed in 154 stages of 9 horizontal wells in Block Fang 198-133 within 32 days. Accordingly, a set of specific factory-like fracturing specification for Daqing oilfield was established. As a result, 1.55×10 4m 3 of oil or 38.1m 3 per well per day has been produced during 158 days after fracturing stimulation, which is 14 times higher than the vertical well stimulated in the block. With the increase of productivity and efficiency, the comprehensive operating cost was reduced by 36%. Thus, the tight oil reservoirs in the block were fully recovered and developed economically and effectively. And the practices are significant to the production improving of tight oil reservoirs in other blocks of Daqing oilfield. Reference | Related Articles | Metrics Select Liang Xing, Xu Jinbin, Liu Cheng, Jiao Yajun, Shu Honglin, Chen Anhuan, Bian Weikun, Tao Xiaofeng Geosteering technology based on geological and engineering integration for horizontal wells in Zhaotong National Shale Gas Demonstration Zone China Petroleum Exploration    2019, 24 (2): 226-232.   DOI: 10.3969/j.issn.1672-7703.2019.02.011 Abstract （1069）   HTML    PDF （12255KB）（767）    Knowledge map    Save Compared with the shale gas fields in North America and the Sichuan Basin, the Zhaotong National Shale Gas Demonstration Zone is characterized by micro-relief structures with developed fractures, poor stress conditions and narrow target reservoir window. In this zone, it is hard to control the trajectory of a horizontal well and develop efficiently. Considering geological and engineering factors, a model was proposed for increasing ROP and production efficiency by controlling trajectory at low cost. The model emphasizes geological optimization in pre-drilling, drilling and post-drilling analysis to understand the distribution law of high-quality shale reservoirs and technical designing. It ensures the precision in landing and tracking horizontal section by integrating techniques including element mud logging + gamma ray control while drilling, point-by-point seismic guidance, ant tracking + apparent polarity attributes, and geosteering tools. It ensures drill-in rate and smooth trajectory, improves drilling quality and lays a solid foundation for high gas production. The proposed geosteering technology has been successfully applied in field. Reference | Related Articles | Metrics Select Zou Caineng, Gong Jianming, Wang Hongyan, Shi Zhensheng Importance of graptolite evolution and biostratigraphic calibration on shale gas exploration China Petroleum Exploration    2019, 24 (1): 1-6.   DOI: 10.3969/j.issn.1672-7703.2019.01.001 Abstract （1200）   HTML    PDF （2597KB）（748）    Knowledge map    Save Shale gas has realized industrial developing in the Sichuan Basin and its peripheral region, and has become one of the important resources for future natural gas production growth of China. The shale gas in the Sichuan Basin is produced from the Ordovician and Silurian strata which are deeply buried with high thermal evolution and complicated tectonic history, thus bring challenges to the shale gas exploration. Fortunately, the gas-producing black shale is rich in graptolite fossils. Paleontologists used the method of graptolite biostratigraphy to recognize the precise stratigraphic intervals of favorable gas-producing black shale in the Sichuan Basin using well-established high-resolution graptolite biostratigraphy, providing a critical tool to guide the exploration of the shale gas recourse in China. Reference | Related Articles | Metrics Select Li Guoxin, Guo Xujie, Du Jinhu, He Haiqing, Lin Shiguo, Yang Fan, Yi Shiwei, Fan Tuzhi, Jin Wudi, Gao Yang, Li Mingpeng Research and application of the index system model of exploration benchmarking management China Petroleum Exploration    2019, 24 (1): 7-15.   DOI: 10.3969/j.issn.1672-7703.2019.01.002 Abstract （974）   HTML    PDF （1021KB）（651）    Knowledge map    Save As an advanced management method, benchmarking management is widely used by famous enterprises at home and abroad, and it provides an enterprise with a goal of struggle and a thought to continuous improvement. Based on benchmarking analysis, shortcomings can be identified and reduced, and the overall competitiveness and management of an enterprise can be improved. For challenges from low oil prices, low grade and high cost, China National Petroleum Corporation strengthened the innovation of benchmarking management, and provides effective methods for improving the overall management and the basis for making effective decisions on exploration and deployment through benchmark analysis. In this paper, the necessity and significance of exploration benchmarking management is analyzed; the methods and implementation steps of benchmarking management are introduced; a systematic and complete index system is established by taking 16 oil and gas field enterprises as research cases, a benchmarking evaluation model is designed; and finally four primary index systems including plan, cost, effectiveness and reserves, and 16 secondary index systems are established. The highlights are an effectiveness index of 3D seismic survey and an index model of reserves evaluation. Demonstration and application in oilfields have proved all indicators good, and exploration and management have been improved continuously. These may ensure new results of oil and gas exploration, and facilitate high-quality exploration to a new level. Reference | Related Articles | Metrics Select Du Jinhu, Tian Jun, Li Guoxin, Yang Haijun, Zhang Yijie, Li Yong, Xu Zhenping, Luo Haoyu Strategic breakthrough and prospect of Qiulitag structural belt in Kuqa depression China Petroleum Exploration    2019, 24 (1): 16-23.   DOI: 10.3969/j.issn.1672-7703.2019.01.003 Abstract （1049）   HTML    PDF （4989KB）（491）    Knowledge map    Save In the Qiulitag structural belt, one of the important oil and gas exploration zones in Kuqa depression of the Tarim Basin, early exploration discovered the large Dina 2 condensate gas field, the Chaule 1 reservoir and the Dongqiu 8 shallow reservoir on the east and west sides. Since then, no gas reservoir has been found for 16 years. In the Qiulitag structural belt, the surface condition is difficult with blade-like ridges here and there, and the underground composite salt layer is strongly deformed. Resulting in poor 2D seismic data, it's difficult to accurately identify the structure. In this study, by focusing on the task to break through exploration technology bottleneck in "identifying traps", and strengthening the regional geological research, structural segments were described, especially the Zhongqiu segment of the Qiulitag structural belt; by improving 2D wide-line seismic acquisition and processing, traps were found in batches, and the breakthrough was located; by scientific decision-making, and advanced deployment of Dongqiu 8 mountain 3D seismic survey, the subsalt Zhongqiu 1 structural trap was identified and an exploration well, Zhongqiu 1, was drilled. High-yield industrial oil/gas flow was obtained from the Cretaceous Bashijiqik Formation, proving a strategic breakthrough and indicating a bright future in oil and gas exploration in the Qiulitag structural belt. Reference | Related Articles | Metrics Select Du Jinhu, Zhi Dongming, Tang Yong, Jia Chunming, Xu Yang, Abulimity·Yiming, Deng Yong Prospects in Upper Permian and strategic discovery in Shawan sag, Junggar Basin China Petroleum Exploration    2019, 24 (1): 24-35.   DOI: 10.3969/j.issn.1672-7703.2019.01.004 Abstract （964）   HTML    PDF （5862KB）（725）    Knowledge map    Save According to the hydrocarbon accumulation characteristics and hydrocarbon distribution laws of Upper Permian in the Mahu oil region, the distribution of three types of oil and gas reservoirs were clarified, and the pattern of large-scale hydrocarbon accumulation above the source rock of extensive retrograding fan delta in the stratigraphic setting was established. It was the first time that the Permian stratigraphic systems in the east and west of the Junggar Basin were unified. By petroleum geological analog, a significant petroleum replacement field with the area over 2.5×10 4 km 2 was discovered in the middle assemblage in Upper Jurassic of the Central depression. The controlling of palaeogeomorphology on sedimentation and sand was analyzed interactively, and it is indicated that the Upper Permian is controlled by groove systems and 8 major deposits of fan deltas are developed in the setting of stratigraphic overlap. Thus, it is confirmed that 4 major exploration fields and 10 favorable zones are good in hydrocarbon accumulation conditions, and they satisfy the conditions of overall exploration. The west slope of Shawan sag is a favorable destination of long-term hydrocarbon accumulation. In the Upper Wuerhe Formation and Baikouquan Formation, there are favorable reservoirs of fan delta front facies, with good physical properties. There are a great number of broad lithologic trap groups, with abundant resources and low exploration degree. It is revealed that the west slope is a major field of risk exploration with the characteristics of multi-layer stereo hydrocarbon accumulation. In 2018, the lithologic oil reservoir group in the stratigraphic setting of west slope was selected as the breakthrough point for exploration, where Well Shatan 1 was deployed. The significant discovery demonstrates the potential of multi-layer stereo exploration, similar to that in the Mahu sag. And it is expected to be connected with Mahu oil region, forming an other great exploration area. Reference | Related Articles | Metrics Select Shi Hesheng, Wang Qingbin, Wang Jun, Liu Xiaojian, Feng Chong, Hao Yiwei, Pan Wenjing Discovery and exploration significance of large condensate gas fields in BZ19-6 structure in deep Bozhong sag China Petroleum Exploration    2019, 24 (1): 36-45.   DOI: 10.3969/j.issn.1672-7703.2019.01.005 Abstract （2518）   HTML    PDF （3743KB）（518）    Knowledge map    Save The deep formation of Bozhong sag in the Bohai sea area has favorable geological conditions for the formation of natural gas fields. BZ19-6 large-scale condensate gas field is the largest natural gas field discovered so far in Bohai Bay Basin, with reserves exceeding 100 billion cubic meters. Based on a large number of core, thin section, well logging and geochemical data, the deep gas reservoir-forming conditions in Bozhong 19-6 structure are systematically analyzed. It is proved that the deep layer of Bozhong sag has great potential for generation of natural gas and is the basis for the formation of large-scale condensate gas fields. The extremely thick overpressure mudstones of Dongying Formation and Shahejie Formation with stable regional distribution provide good sealing conditions for the preservation of large condensate gas fields. It is the first time to discover huge thick fractured-porous sandy conglomerate reservoir in Kongdian Formation of Paleogene in Bohai Bay Basin, which breaks through the forbidden area of searching for thick sandy conglomerate reservoir in depression area and greatly expands the exploration field of Paleogene oil and gas. Based on the analysis of the formation mechanism of high quality reservoirs in Archean deep buried metamorphic rock buried hills, it is proposed that the key to the formation of high quality reservoirs in metamorphic rocks is the development of large-scale fracture systems and dynamic fracture zones in buried hills caused by multi-stage dynamic fragmentation. These results have guided the discovery of large-scale condensate gas fields in Bozhong 19-6 structure, contributed to the breakthrough in natural gas exploration in Bohai Sea, and have important guiding significance for deep gas exploration in Bohai Bay Basin. Reference | Related Articles | Metrics Select Wang Tieguan, Gong Jianming Meso-Neoproterozoic geology and petroleum resources prospect in China China Petroleum Exploration    2018, 23 (6): 1-9.   DOI: 10.3969/j.issn.1672-7703.2018.06.001 Abstract （1152）   HTML    PDF （20208KB）（397）    Knowledge map    Save The Meso-Neoproterozoic strata dated back to 1800-541 Ma are the oldest sedimentary strata in China. Petroleum geologists never thought that hydrocarbon could be found within the Meso-Neoproterozoic strata, or took them as exploration targets since no reliable early lives and associated fossils were identified in these strata until the 1950s. In recent decades, however, paleontologists have made great achievements in the fundamental research on early Proterozoic lives, and petroleum geologists and geochemists also found numerous oil seeps, asphalts and source rocks with rich organic matters. These organic matters are in immature to over-mature phases, even still in the "liquid oil window" in some zones, so that dozens of primary Meso-Neoproterozoic oil and gas fields have been found with large amount of oil/gas reserves and high oil/gas flows, indicating that the Meso-Neoproterozoic strata have favorable conditions for generation and accumulation of large-scale petroleum resources. Reference | Related Articles | Metrics Select Zhang Yiming, Zhang Ruifeng, Wang Shaochun, Liu Xiheng, Li Yongjun, Liu Jing, Wang Huilai, Wang Jian, Wu Chenlin, Dan Weining Practice and understanding of great discovery in oil and gas exploration in Linhe depression of Hetao Basin China Petroleum Exploration    2018, 23 (5): 1-11.   DOI: 10.3969/j.issn.1672-7703.2018.05.001 Abstract （1972）   HTML    PDF （3361KB）（724）    Knowledge map    Save The Linhe depression of Hetao Basin is a Meso-Cenozoic strike-slip pull basin. The early stage wells were mainly concentrated in the slope zone, which had oil and gas shows but no substantial breakthroughs. Recently, new and old data including gravity, magnetic, electric, seismic, drilling and geology data were used to investigate the basin property, structural characteristics, resource potential and reservoir-cap combination. It is understood that the depression is a strike-slip pull depression, which is zoning east-west and blocking north-south. Two major source rocks in the Lower Cretaceous and Oligocene respectively are confirmed. Three sets of source-reservoir-cap are identified. Indepth comprehensive analyses of the trap-source relationship and the oil and gas accumulation models showed that the Jilantai buried hill is favorable for oil and gas accumulation for its adjacency to the northern deep sag hydrocarbon generation area with Langshan piedmont fault as the main channel for oil and gas migration providing good lateral oil supply conditions. The Jilantai buried hill and its periclinal fault structural belt were selected to deploy Well JHZK2, Well JHZK7 and Well Jihua 2x. All of the three wells have obtained industrial oil flow, which was a great discovery of Linhe depression and demonstrated a broad exploration prospects. With the attention of PetroChina Company and the support of Changqing Oilfield Company as the basis, the innovative geological understanding and scientific deployment and decision-making as prerequisites, the thought-transform and key point-selecting as the key and the selection of economically applicable technologies as the guarantee, the Linhe Depression successfully achieved rapid exploration. Reference | Related Articles | Metrics Select Dai Jinxing, Gong Jianming Establishment of coal-derived gas geological theory and its strategic significance to the development of natural gas industry in China China Petroleum Exploration    2018, 23 (4): 1-10.   DOI: 10.3969/j.issn.1672-7703.2018.04.001 Abstract （912）   HTML    PDF （17451KB）（587）    Knowledge map    Save In the 1970s, China's energy supply was mainly coal and oil. Natural gas, an important source of energy, was still ignored by most people at that time. The prevailing "monism" theory of oil-derived gas then held that coal-producing areas wouldn't produce natural gas. However, Chinese scholars first put forward the concept of coal-derived gas in 1978. In the next 40 years, the coal-derived gas geological theory in China has gone through the whole process of introducing, absorbing, innovating, developing, forming system and guiding the rapid development of natural gas industry. Its contents include the index system of gas source identification, the accumulation mechanism and distribution law, and the evaluation and prediction technique of coal-derived gas, etc. The application of the theory has accurately predicted more than five large gas fields of over 100 million m 3 magnitude, making the proportion of coal-derived gas in natural gas of China soar from 10% to 67%, and propelling the rapid growth of natural gas reserves and production in China. Apparently, the theory has important strategic significance to Chinese natural gas industry and has made fundamental contribution to the fast development of gas industry in China. Reference | Related Articles | Metrics Select Wu Qi, Hu Wenrui, Li Xun The phenomenon of “alienation” of geology-engineering integration in exploration and development of complicated oil and gas reservoirs, and related thoughts and suggestions China Petroleum Exploration    2018, 23 (2): 1-5.   DOI: 10.3969/j.issn.1672-7703.2018.02.001 Abstract （1329）   HTML    PDF （3795KB）（470）    Knowledge map    Save In the past three years, under the influence of international crude oil prices, the domestic oil and gas industry has been facing a huge cost pressure; the application effects of geology-engineering integration are quite different; some projects lagged behind schedule, and the results are not satisfactory. To solve these problems, four points are put forward after many practices and considerations:First, the implementation plan and objectives of geology-engineering integration should be made based on the premise of economy; Second, "major staged-challenging contradictions" in the study of oil and gas reservoirs should be identified based on effective data, to solve field problems efficiently and quickly; Third, multidisciplinary integration of "geology-engineering" should be achieved using data as a link; Fourth, data "platformization" should be gradually promoted in projects with geology-engineering integration to expand the application scope and period of geology-engineering integration. To develop and play the practical role of geology-engineering integration characterized by highly practical technology and management, it is necessary to abandon some traditional academic management or concepts, be creative and bold in science and practice, and make it play an important role in any stage of the development of complicated oil and gas reservoirs. Reference | Related Articles | Metrics Select Hou Qijun, He Haiqing, Li Jianzhong, Yang Tao Recent progress and prospect of oil and gas exploration by PetroChina Company Limited China Petroleum Exploration    2018, 23 (1): 1-13.   DOI: 10.3969/j.issn.1672-7703.2018.01.001 Abstract （3255）   HTML    PDF （3448KB）（887）    Knowledge map    Save In recent two years, PetroChina Company Limited (hereinafter referred to as PetroChina for short) has made 12 important exploration progresses in domestic oil and gas exploration in clastic rocks, marine carbonate rocks, foreland thrust belts, lacustrine carbonate rocks, mature fields and unconventional oil and gas fields. Based on comprehensive analysis of PetroChina own oil and gas resources, remaining oil and gas resources and their exploration degree, and the influence of geological understanding and exploration technology on oil and gas exploration, this paper concludes that the prospect of domestic oil and gas exploration is still promising, but also faces many challenges, such as complex underground conditions, deeper burial depths and poorer quality of remaining resources. In the future, on the assumption of long-term low oil prices, PetroChina will adhere to the strategies of resources and innovation, follow the principle of efficient exploration, focus on "four types of exploration" and strengthen "three fields of innovation", so as to make new discoveries and breakthroughs in oil and gas exploration for sustainable and steady development. Reference | Related Articles | Metrics Select Fu Jinhua, Shi Yujiang, Wang Juan, Chen Fang, Yang Zhuo Construction of service-oriented shared data center for exploration and development of Changqing oilfield China Petroleum Exploration    2017, 22 (6): 1-8.   DOI: 10.3969/j.issn.1672-7703.2017.06.001 Abstract （1331）   HTML    PDF （3110KB）（485）    Knowledge map    Save Data always take the basal and key position in an oilfield enterprise's informationization. In the Changqing Oilfield, datarelated issues are becoming main bottlenecks restricting the value and benefits of information systems, as its informationization changes from centralized database construction to integrated application and big data analysis during the 13 th Five-Year Plan. The traditional data management mode is based on database and highlight the capitalized management of data by disciplines, making this mode inconvenient for the integration of multi-disciplinary applications. Data center construction and management mode in the era of digitalization is studied strategically according to the idea of life-cycle data management for hydrocarbon reservoirs. Thus, a data center mode of hydrocarbon reservoirs with data service and analysis application as the core, integration of business dominant, business flow and data flow, centralized management and on-line monitoring is proposed to ensure that the data is normalized. This mode can provide effective guarantee for resource sharing, collaborative research and comprehensive decision. Reference | Related Articles | Metrics Select Du Jinhu Analysis of natural gas accumulation conditions and exploration perspective in the central paleo-uplift belt (north), Songliao Basin China Petroleum Exploration    2017, 22 (5): 1-14.   DOI: 10.3969/j.issn.1672-7703.2017.05.001 Abstract （1192）   HTML    PDF （5364KB）（453）    Knowledge map    Save The central paleo-uplift belt (north) of the Songliao Basin, as one major region of risk exploration of natural gas, has favorable conditions for natural gas accumulation. However, no breakthrough has been made in this region for decades, and the hydrocarbon accumulation conditions and exploration perspective have not been thoroughly studied. This paper analyzes natural gas accumulation conditions and exploration targets in the central paleo-uplift belt (north) using core, mud logging, well logging, 3D seismic, gravity and magnetic data as well as a great deal of statistics, analysis and geology studies, and proposes new four cognitions:(1) the central paleo-uplift belt has features of buried hill and was formed on the thrust folded base; (2) the source rock has a high organic matter abundance, huge gas generating potentials and strong lateral gas supplies in the Shahezi Formation of the Xujiaweizi rift in the east of the central paleo-uplift belt (north); (3) the central paleo-uplift belt (north)contains four types of reservoirs:granite, metamorphite, conglomerate and sandstone; (4) the central paleo-uplift belt (north)contains three types of traps, two sets of conductive systems and three types of gas pools. Based on the results, the exploration targets of the basement buried hill gas pools and the gully lithologic gas pools have been selected, 10 class I and 6 class Ⅱ exploration regions have been evaluated and optimized. This provides the scientific base for risk exploration of deep gas reservoirs in the central paleo-uplift belt (north), the Songliao Basin. Reference | Related Articles | Metrics Select Sun Huanquan Exploration practice and cognitions of shale oil in Jiyang depression China Petroleum Exploration    2017, 22 (4): 1-14.   DOI: 10.3969/j.issn.1672-7703.2017.04.001 Abstract （1543）   HTML       Knowledge map    Save Great success has been achieved for the exploration and development of marine shale oil in North America, revealing the significant value of industrial shale oil exploration and development. When shale oil exploration is practically carried out in the Jiyang depression which is the typical representative of continental faulted basin in eastern China, a series of technologies are adopted. It is revealed by the comprehensive source rock evaluation technology that the hydrocarbon generation in mud shale of saline lake is characterized by early hydrocarbon generation and high hydrocarbon-generating transformation ratio. It is confirmed by the mud shale micropore structure characterization technology that laminated lithofacies has the reservoir properties of high porosity, large pore diameter and good connectivity. And by virtue of the quantitative free oil evaluating technology, the differential enrichment mode of free oil in favorable lithofacies of mud shale in different sedimentary environments in the Jiyang depression is established. The shale oil in the Jiyang depression is compared with that in North America. It is indicated that in the Jiyang depression, the development of favorable lithofacies is the base of shale oil enrichment, appropriate evolution degree is the condition of shale oil enrichment, sufficient free composition is the key to shale oil enrichment, and good crushability is the guarantee of effective development. And finally, the shale oil zone selection and evaluation criterion suitable for the saline lake deposit within continental faulted depression in eastern China is prepared. Reference | Related Articles | Metrics Select Xie Huiwen, Neng Yuan, Jing Bing, Zhu Yongfeng, Wang Bin New discovery in exploration of Cambrian-Ordovician dolomite buried hills in Tarim Basin and its significance China Petroleum Exploration    2017, 22 (3): 1-11.   DOI: 10.3969/j.issn.1672-7703.2017.03.001 Abstract （1773）   HTML    PDF （5029KB）（517）    Knowledge map    Save Since the breakthrough was made in Well Central Tarim 1 in 2008, oil and gas exploration in the Cambrian-Ordovician dolomite buried hills has been continued in the Tarim Basin. Except that effective exploration and development was carried out in the Yaha-Yingmaili Cambrian dolomite buried hill in the northern North Tarim uplift, only two wells, Central Tarim 1 and Shan 1, revealed oil and gas in the Central Tarim uplift-Bachu uplift belt. All regional exploration operations failed, and the exploration in the dolomite buried hills in this belt almost stalled for over 20 years. In 2016, after further understanding of the structural model and analysis of the hydrocarbon accumulation conditions, two wells (Ross 2 and Zhonggu 58) were drilled in the Maigaiti slope and the eastern Central Tarim uplift, respectively, and delivered high-yield of industrial oil and gas flow from the dolomite buried hills. This recorded a new discovery in the exploration of dolomite buried hills and indicated the important exploration value in the Cambrian-Ordovician dolomite buried hills. Re-processing and re-interpretation of 2D and 3D seismic data confirmed three dolomite buried hill zones in the eastern Central Tarim uplift, the Luonan- Niaoshan structural belt and the East Mahu structural belt, covering a favorable area of 1600 km 2. Reservoirs in the dolomite buried hills are characterized by shallow depth (3500-5500 m) and high exploration efficiency, showing large exploration potentials. Reference | Related Articles | Metrics Select Du Jinhu, He Haiqing, Zhao Xianzheng, Zhang Yiming, Wang Quan, Zhang Ruifeng, Hou Fengxiang, Han Chunyuan, Fan Bingda Signifcant exploration breakthrough in Yangshuiwu ultra-deep and ultra-high temperature Ordovician buried-hill in Langgu sag, Bohai Bay Basin China Petroleum Exploration    2017, 22 (2): 1-12.   DOI: 10.3969/j.issn.1672-7703.2017.02.001 Abstract （2100）   HTML    PDF （4354KB）（452）    Knowledge map    Save The Hexiwu buried-hill zone is a major hydrocarbon accumulation in the Langgu sag in northern Jizhong depression, where no new breakthrough has been made since three small Ordovician buried-hill reservoirs (Bieguzhuang, Liuqiying, Liuqiying West) were discovered in the south during the early exploration stage. Pertinent and deep study was conducted on the structure and reservoir characteristics that constrains the hydrocarbon accumulation in the Ordovician heterogeneous carbonate buried-hill reservoir, as well as reservoir stimulation and other major techniques. Through the merged 3D seismic prestack depth migration (PSDM) processing and precise structure interpretation, the zonal structure framework was ascertained, and accordingly the Yangshuiwu buried-hill structure comprising three local highs was discovered. Analysis was made on the Ordovician sedimentary facies and reservoir characteristics, indicating that the dolomite flat and dolomitic lime flat are favorable sedimentary facies belts within the study area, and the reservoir development is jointly controlled by rock type, fracture distribution and karstifcation. The dolomite serves as major reservoir. Through the study of hydrocarbon supply conditions, tectonic evolution and its control on hydrocarbon accumulation, and reservoir-cap rock assemblage, a new model of massive-laminar complex buried-hill accumulation was established for the Ordovician carbonate heterogeneous reservoir within the Hexiwu buried-hill zone. Guided by the new study results, a risk exploration well, Antan 1X, was deployed at the structure high in the west of Yangshuiwu buried-hill. This well revealed a high yield of 40.89×10 4m 3 gas and 71.16 m 3 oil per day in the Ordovician reservoir, marking a signifcant breakthrough in ultra-deep and ultra-high temperature Ordovician buried-hill exploration in the north of Jizhong depression. Moreover, the practice exhibits the promising exploration prospect in this domain. Reference | Related Articles | Metrics page Page 1 of 2 Total 44 records First page Prev page Next page Last page