Any big basins are related the regional structural background in terms of formation, shaping and development. The global oil and gas distribution is in close relations with large structural belts. The foreland basins are the oil and gas abundance zones while the palaeohighs control the large-scale oil and gas accumulation. Distribution ofmajor oil and gas zones in the world is apparently characterized with sequence from foreland basin to palaeohigh. China's basins are characterized with regional structural features, such as making-up of small continental blocksmulti-cycling, and strong inland structural activities in later periods. Based on the global oil and gas exploration experiences and China's unique geological features, the future exploration should be focused on foreland basins, palaeohighs, large-area stratigraphic lithological belts of sag-type basins, and oil-enriched depressions of rift basins. With adoption of integrated exploration methods, new breakthroughs will be made in China's exploration through tenacious efforts.

Exploration of Erlian Basin and Jizhong Depression in the recent years indicates that the stratigraphic lithologic oil and gas reservoirs of oil-enriched sags in the highly mature exploration region still have great potential for exploration. It is the important exploration field for search of large-scale reserves. The new exploration conception should be established in exploration of the lithologic stratigraphic oil and gas reservoirs. As for the exploration principles, it is necessary to bring about five turns from positive structural belt to negative structural belt; from high position of structural belt to the lateral positions of structural belt; from structural belt to lithofacies belt, belt of slope, overlap belt and belt of erosion; from ring bottom land to bottom groove, and from the single oil and gas reservoir type to the multiple types. The technological methods of exploration include optimized assessment technology for the favorable belts of lithologic stratigraphic oil and gas reservoirs, technology for confirmation and assessment of lithologic stratigraphic traps, and assessment technology for preliminary exploration of lithologic stratigraphic oil reservoirs.

Based on the characteristics of hydrocarbon source rock development and the types of oil and gas reservoirs, the Upper Triassic-Jurassic oil and gas system in Sichuan Basin is further divided into two sub-systems - Upper Triassic and Jurassic. Taking the fundamental elements of the oil and gas systems as the basis for the study, this article is focused on the migration and accumulation conditions, main controlling factors and the abundance law of Upper Triassic oil and gas system and Jurassic oil and gas system. The main controlling factors for migration and accumulation of Upper Triassic oil and gas system are the strong gas infill sources and the palaeohigh and faulted fractures of Yanshanian Period. Late Jurassic and Early Cretaceous are the main stages for formation the gas reservoirs. Jurassic oil and gas system has the different migration and accumulation laws and main controlling factors in the different zones and belts. The oil and gas reservoirs in Central Sichuan region are formed mainly under the control of fourmain factors - oil source zone, palaeohigh, fault or fracture, and extension of effective reservoir body, leading to existence of fracture-ligthologic oil reservoirs. The oil and gas reservoirs in Bazhong-Pingchang region are controlled mainly by the hydrocarbon generation center and fracture, leading to existence of lithologic-fracture oil reservoirs. The main controlled factors for the reservoirs in Dabashan frontal area are fracture, effective reservoir sandbody and storage condition, leading to existence of fracture-lithologic oil and gas reservoirs

This thesis briefs about themain methods to increase the reserves of Long-611 Block in the eastern depression of Liaohe Basin by means of the advanced technology. The whole process is a progressive exploration to search for the reserves. First of all, the geologists make analysis of the geological issues existing in the area to locate the horizons accurately. A number ofmethods are used to interpret the structure and confirm the interpretations with each other. Based on location of the structures, the integrated geological study is conducted to find Long-2 Trap, and the southern expanded peripheral area of Longqi-13. The newly additional natural gas in place is 6.58(108m3, creating a successful model for progressive exploration of the high maturing exploration area.

This article gives the practical cases in processing and interpretation of the data concerning foothill thrust belt and the data concerning the structures related to salt rock. Based on the existing technology, the efforts aremade for identification of gaps in order to come up with the conceptions for improvement. This article points out that invigoration of technological development comes from the continuous efforts for new conceptions. To accelerate technological progress and make breakthrough in exploration as early as possible, it is necessary to put into practice new conceptions on the basis of technological summarization and creation.

With the deepening of oil and gas exploration, the topography becomesmuch complicated such as the mountainous regions, alluvial cone, gobi ,desert, loess plateau in middle and west China and swamp, offshore in east China. Many complex questions lie ahead of oil and gas exploration workers, for example how to optimize the seismic line allocation in complicated topography area, how to cut down the field work intensity, how to control effectively the cost of seismic acquisition and how to ensure the quality of seismic data. This paper sums up five aspects of seismic survey of high precision remote sensing data for applications in the complicated area The results of application in Yongdeng area of Minhe Basin and the south Junggar Basin show effectively high precision remote sensing data is useful for obtaining high precision seismic data.

Two suites ofmajor hydrocarbon source rock were developed in the lower part of Lower Tertiary, and Carboniferous-Permian in Bohai Gulf Basin, enriching unproved oil and gas resource. There oil and gas reservoirs are various kinds of deeply buried hills. Gravity, magnetic and electricmethods in these areas can provide favorable geophysical condition, and the feasibility and effectiveness applied in the deep Buried hills has been confirmed by forward and inversion method and practices. The existing non-seismic data including gravity, magnetic and electric data acquired in 1960s and 1970s are on the scale of 1:100 thousand or 1:200 thousand with sparse survey net and low precision, which can not satisfy the purpose of the present target exploration.Modern advanced acquisition and interpretation techniquesmake it possible to clarify deep complex geological issues and to find sustainable reserves for development of petroleum industry. So it is necessary to conduct new round comprehensive geophysical exploration for deep formation and new fields

Use of the resistivity curve for identification of oil and gas water beds in the compact conglomerate reservoir is always a headache in logging interpretation owing to the limitation of the measuring principle of conventional electric logging method. The key to logging assessment is division of the fracture section and level and effective identification of dissolved pores and cavities. Integrated assessment is made on the oil and water beds with the help of the first-hand data like gas testing and logging. This article makes in-depth study of the basic characteristics and electric characteristics of the compact conglomerate reservoirs in Caiyu Area of North China in the attempt to find a set of methods for calculation of the reservoir parameters suitable for this area. With introduction of some indicator parameters like reservoir structural parameters and secondary pore indicator parameters, accurate description ismade on the conglomerate reservoir. The results of the study have been applied to the reserves calculation and oil field development

An efficient working schedule of the geological intendance for exploration well program has been established in the Shengli Oilfield which includes the engineering design, program implementation, well logging and well completion. Based on the author￡§experiences in the past 20 years this paper discusses that the geological intendance is a useful tool for quickening well-drilling, shortening well-drilling time, saving drilling investment and improving well-drilling effectiveness. The geological intendance can make a prediction for the subsurface geology to avoid drilling accident and non-efficient drilling, and to optimize coring. It can provide some suggestions of drilling engineering and make a report of the drilling program to the manager. As for collection of all useful data, identification of oil and gas shows, protection of oil reservoirs in the drilling, the geological intendance in exploration program has played a great role.Meanwhile, the authormakes suggestions on some technique improvement in the drilling.

With the internationalization of investment of petroleum exploration and development, there are increasing investment opportunities and investment risks. Therefore, portfolio management and portfolio optimization technology are playing more and more important role. This paper introducesmodern portfolio theory to portfolio optimization and portfoliomanagement of petroleum exploration objects. It briefly introduces the basic ideas and principles of modern portfolio mathematicalmodel, discusses the portfolio model that suits for petroleum exploration and development projects of China, and expatiates the solution algorithm of this mathematical model. Lastly, thismodel was applied in portfolio management of actual exploration object in Daqing Exploration Area. A optimization investment decision was provided, and the validity of themodel and the feasibility of the method were also proved

Indonesia is located in the combination region of Eurasian-Asian, Indian -Australian and Pacific plates, so its structure is very complicated. There are about 60 sedimentary basins in Indonesia, 11 of them are oil and gas producing basins which are distributed on Sumatra, Java, East Kalimadan, East Indonesia and South China Sea. The oil and gas production of Indonesia reached the highest(over 80 million tons) in the 1960s and was 5.6 million tons in 2002. From the 1960s, Indonesia began to introduce foreign investment into oil and gas exploration, involving more than 30 foreign oil companies at one time. China oil companies entered into the field of Indonesian oil and gas production from 1990s. Until now, CNOOC has working interest in 9 blocks and CNPC in 7 blocks and SINOPEC in 1 block. During 2003-2004. CNPC has obtained good achievements in the exploration of Indonesia and found 11 oil and gas fields