渤海湾盆地沧东深凹区沧探1井古近系孔二段重大突破与勘探意义

doi:10.3969/j.issn.1672-7703.2024.02.002

摘要/Abstract

摘要： 近期中国石油风险探井沧探1井在古近系孔店组孔二段试油获高产油气流，实现了渤海湾盆地沧东凹陷深层岩性油气藏勘探的重大突破。为评价沧东深凹区勘探前景，基于沧探1井钻探认识，系统梳理沧东深凹区有利成藏条件，指明下一步勘探方向。研究表明，孔二段沉积期深凹区为沧东断层控制的沉降中心，为半深湖—深湖相烃源岩发育提供可容纳空间，湖扩期烃源岩分布广泛，有机质类型以Ⅱ型为主，有机质丰度高，R_o平均为1.3%，处于成熟—高成熟演化阶段；深凹区位于湖盆边缘，盆山间发育完整的源—渠—汇系统，湖盆内形成多个扇三角洲规模储集体，具备形成大型岩性油气藏的条件；油气早生早排、持续充注，伴生的酸性流体与生烃增压作用促使粒间溶孔、粒内溶孔等次生孔隙发育，烃源岩成熟与储层发育时空匹配，深凹区内常规砂岩油藏与页岩油藏连续成藏。综合分析认为，沧东深凹区孔二段具有良好的勘探前景，盆缘发育的多个扇三角洲砂体具备近源成藏优势，可成为规模增储的重要接替领域。

关键词: 渤海湾盆地, 沧东凹陷, 孔二段, 成藏条件, 勘探突破

Abstract: Recently, the high-yield oil flow was obtained in the second member of the Paleogene Kongdian Formation (Kong 2 member) in a risk exploration well Cangtan 1 drilled by PetroChina, indicating a major breakthrough in the exploration of deep lithologic oil and gas reservoirs in Cangdong Sag in Bohai Bay Basin. Based on the understanding of Well Cangtan 1, favorable conditions for hydrocarbon accumulation in Cangdong deep subsag area are systematically analyzed to evaluate the exploration prospects and identify the favorable exploration orientation. The study results show that, during the deposition period of Kong 2 member, Cangdong deep subsag area was a subsidence center controlled by Cangdong Fault, providing accommodation for the development of semi deep-deep lake facies source rock. During the lake expansion period, source rock was widely deposited in the deep subsag area, with Type Ⅱ organic matter, high TOC, and mature-highly mature thermal evolution stage (average R_o of 1.3%). The deep subsag area was located at the edge of the lake basin, developing a complete provenance-channel-accumulation system between the basin and mountains, and forming multiple large-scale fan delta reservoirs in the lake basin, which provided favorable conditions for the formation of large-scale lithologic oil and gas reservoirs. The source rock was characterized by early oil generation and expulsion, and continuous oil charging, and the associated acidic fluids and hydrocarbon generation pressurization promoted the development of secondary pores such as intergranular and intragranular dissolution pores. The mature stage of source rock well matched with the development of reservoir, and conventional sandstone oil reservoir and shale oil reservoir were contiguously developed in the deep subsag area. The comprehensive analysis indicates that Kong 2 member in Cangdong deep subsag area has good exploration prospects, and multiple fan delta sand bodies developed in the basin margin have the advantage of near-source hydrocarbon accumulation, which shows a major replacement field for the large-scale reserve increase.

中图分类号:

TE111.1

周立宏, 陈长伟, 孙统, 宋舜尧, 董晓伟, 吴雪松, 杨朋, 王帅, 段润梅, 刘会纺, 李晓静, 郭秋霞. 渤海湾盆地沧东深凹区沧探1井古近系孔二段重大突破与勘探意义[J]. 中国石油勘探, 2024, 29(2): 16-29.

Zhou Lihong, Chen Changwei, Sun Tong, Song Shunyao, Dong Xiaowei, Wu Xuesong, Yang Peng, Wang Shuai, Duan Runmei, Liu Huifang, Li Xiaojing, Guo Qiuxia. A major discovery in the second member of the Paleogene Kongdian Formation in Well Cangtan1 in Cangdong deep subsag area in Bohai Bay Basin and its exploration significance[J]. China Petroleum Exploration, 2024, 29(2): 16-29.

参考文献

[1] 赵贤正, 金凤鸣, 蒲秀刚, 等.负向构造区油气成藏理论认识与勘探实践[J]. 石油实验地质, 2022,44(1):11-23.
Zhao Xianzheng, Jin Fengming, Pu Xiugang, et al. Theoretical understanding of oil and gas accumulation in negative tectonic area and exploration practice[J]. Petroleum Geology & Experiment, 2022,44(1):11-23.
[2] 赵贤正, 周立宏, 蒲秀刚, 等.断陷盆地洼槽聚油理论的发展与勘探实践：以渤海湾盆地沧东凹陷古近系孔店组为例[J].石油勘探与开发, 2018,45(6):1092-1102.
Zhao Xxianzheng, Zhou Lihong, Pu Xiugang, et al. Development and exploration practice of the concept of hydrocarbon accumulation in rifted-basin troughs: a case study of Paleogene Kongdian Formation in Cangdong Sag, Bohai Bay Basin[J]. Petroleum Exploration and Development, 2018,45(6):1092-1102.
[3] 刘子藏, 周育文, 杨朋, 等.断陷盆地继承性斜坡断砂耦合控藏机制：以沧东凹陷南皮斜坡孔二段为例[J].成都理工大学学报（自然科学版）, 2020,47(6):645-651.
Liu Zicang, Zhou Yuwen, Yang Peng, et al. The reservoir control mechanism by fault-sand coupling in faulted basin and its exploration discovery: a case study of the member 2 of Kongdian Formation in Napi slope of Cangdong Sag, Bohai Gulf, China[J]. Journal of Chengdu University of Technology(Science & Technology Edition), 2020,47(6):645-651.
[4] 周立宏, 陈长伟, 杨飞, 等.渤海湾盆地沧东凹陷页岩油效益开发探索与突破[J].中国石油勘探, 2023,28(4):24-33.
Zhou Lihong, Chen Changwei, Yang Fei, et al. Research and breakthrough of benefit shale oil development in Cangdong Sag, Bohai Bay Basin[J]. China Petroleum Exploration, 2023, 28(4):24-33.
[5] 周立宏, 赵贤正, 柴公权, 等.陆相页岩油效益勘探开发关键技术与工程实践：以渤海湾盆地沧东凹陷古近系孔二段为例[J].石油勘探与开发, 2020,47(5):1059-1066.
Zhou Lihong, Zhao Xianzheng, Chai Gongquan, et al. Key exploration & development technologies and engineering practice of continental shale oil: a case study of member 2 of Paleogene Kongdian Formation in Cangdong Sag, Bohai Bay Basin, East China[J]. Petroleum Exploration and Development, 2020,47(5): 1059-1066.
[6] 李勇, 颜照坤, 李洪香, 等.断坳叠置湖盆岩相古地理研究方法：以沧东凹陷为例[J].石油学报, 2016,37(增刊2):39-55.
Li Yong, Yan Zhaokun, Li Hongxiang, et al. Paleogeography method of fault depression superposition lake basin: a case study of Cangdong Sag[J]. Acta Petrolei Sinica, 2016,37(S2): 39-55.
[7] 颜照坤.黄骅坳陷古近纪构造—沉积演化过程研究[D].成都：成都理工大学, 2014.
Yan Zhaokun. Study on the Structure-sedimentary evolution process in Huanghua Depression during Paleogene[D]. Chengdu: Chengdu University of Technology, 2014.
[8] 周立宏, 蒲秀刚, 陈长伟, 等.陆相湖盆细粒岩油气的概念、特征及勘探意义：以渤海湾盆地沧东凹陷孔二段为例[J].地球科学，2018,43(10):3625-3639.
Zhou Lihong, Pu Xiugang, Chen Changwei, et al. Concept, characteristics and prospecting significance of fine-grained sedimentary oil gas in terrestrial lake basin: a case from the second member of Paleogene Kongdian Formation of Cangdong Sag, Bohai Bay Basin[J]. Earth Science, 2018,43(10):3625-3639.
[9] 钟玮.黄骅坳陷沧东凹陷孔店组二段砂体分布与沉积体系分析[D].荆州：长江大学, 2013.
Zhong Wei. Research of distribution of sand body and sedimentary system of second member of Kongdian Formation in Cangdong Sag, Huanghua Depression[D]. Jingzhou: Yangtze University, 2013.
[10] 叶琳, 张俊霞, 卢刚臣, 等.黄骅坳陷孔南地区古近纪构造—地层格架和幕式演化过程[J].地球科学(中国地质大学学报), 2013, 38(02):379-389.
Ye Lin, Zhang Junxia, Lu Gangchen, et al. Paleogene structure-stratigraphic framework and multiple episode evolution in Kongnan Area, Huanghua depression[J]. Earth Science-Journal of China University of Geosciences, 2013,38(2):379-389.
[11] 杨桥, 漆家福, 常德双, 等.渤海湾盆地黄骅坳陷南部古近系孔店组沉积时期构造古地理演化[J].古地理学报, 2009,11(3):306-313.
Yang Qiao, Qi Jiafu, Chang Deshuang, et al. Tectonopal- aeogeography during the Deposition of Paleogene Kongdian Formation in Kongnan Area, Huanghua Depression of Bohai Bay Basin[J]. Journal of Palaeogeography, 2009,11(3):306-313.
[12] 徐鸣洁, 朱文斌, 胡德昭, 等.利用地球物理资料对沧东断裂带演化特征的研究[J].高校地质学报, 1997(1):52-57,59-62.
Xu Mingjie, Zhu Wenbin, Hu Dezhao, et al. A study on evolution features of Cangdong fault zone by using geophysical data[J]. Geological Journal of China Universities, 1997,3(1):52-57, 51-62.
[13] 徐德英, 朱德献, 段秋梁, 等.黄骅坳陷中南部逆冲推覆构造特征及其形成背景分析[J].中国石油勘探, 2010,15(4):15-18,30.
Xu Deying, Zhu Dexian, Duan Qiuliang, et al. Characteristics and tectonic setting of thrust nappe structure in central-southern Huanghua Depression[J]. China Petroleum Exploration, 2010,15(4):15-18,30.
[14] 高战武, 徐杰, 宋长青.华北沧东断裂的构造特征[J].地震地质, 2000,22(4):395-404.
Gao Zhanwu, Xu Jie, Song Changqing, et al. Structural characters of the Cangdong fault in North China[J]. Seismology and Geology, 2000,22(4):395-404.
[15] 童亨茂, 聂金英, 孟令箭, 等.基底先存构造对裂陷盆地断层形成和演化的控制作用规律[J]. 地学前缘, 2009,16(4):97-104.
Tong Hengmao, Nie Jinying, Meng Lingjian, et al. The law of basement pre-existing fabric controlling fault formation and evolution in rift basin[J]. Earth Science Frontiers, 2009,16(4): 97-104.
[16] 徐祖新, 姜文亚, 张义杰, 等.渤海湾盆地沧东凹陷孔二段优质烃源岩成烃环境[J].东北石油大学学报, 2015,39(4):71-78.
Xu Zuxin, Jiang Wenya, Zhang Yijie, et al. Hydrocarbon forming environment of source rocks of the second member of Kongdian formation in Cangdong Sag, Baohai Bay Basin[J]. Journal of Northeast Petroleum University, 2015,39(4):71-78.
[17] 吴冬, 朱筱敏, 刘常妮, 等.“源—汇”体系主导下的断陷湖盆陡坡带扇三角洲发育模式探讨: 以苏丹Muglad盆地Fula凹陷为例[J]. 高校地质学报, 2015,21(4):653-663.
Wu Dong, Zhu Xiaomin, Liu Changni, et al. Discussion on depositional models of fan deltas in steep slope belt of the rift basin under the guidance of source-to-sink system theory: a case study from the Fula Sub-Basin, Muglad Basin, Sudan[J]. Geological Journal of China Universities, 2015,21(4):653-663.
[18] 韩冰. 黄骅坳陷孔南地区孔二段沉积体系研究[D].成都：成都理工大学, 2009.
Han Bing. Study on sedimentary system of Kong member 2 in Kongnan area in Huanghua Depression[D]. Chengdu: Chengdu University of Technology, 2009.
[19] 钟玮, 蒲秀刚, 何幼斌, 等.渤海湾盆地黄骅坳陷孔南地区古近系孔店组二段物源分析[J].古地理学报, 2012,14(6):707-718.
Zhong Wei, Pu Xiugang, He Youbin, et al. Provenance of the member 2 of Paleogene Kongdian Formation in Kongnan area, Huanghua Depression, Bohai Bay Basin[J]. Journal of Palaeogeography, 2012,14(6):707-718.
[20] 马鹏杰.“构造—沉积—成岩”三相融合及油气富集规律研究：以济阳坳陷南洼陷北部沙田上亚段为例[D].青岛：中国石油大学(华东), 2020.
Ma Pengjie. Linking structural activity, sedimentary process and diagenetic alterations to reservoir quality and hydrocarbon accumulation prediction: a case study from the upper fourth member of Shahejie Formation in the northern Bonan Sag, Jiyang Depression, Bohai Bay Basin, China[D]. Qingdao: China University of Petroleum (East China), 2020.
[21] Giba M, Walsh J J, Nicol A. Segmentation and growth of an obliquely reactivated normal fault[J]. Journal of Structural Geology, 2012,39:253-267.
[22] 曾亚丽, 龙盛芳, 吴朦朦, 等.基于GeoEast地震属性分析的储层预测技术及其在环县地区页岩油勘探开发中的应用[J].石油地球物理勘探, 2022,57(增刊1):196-201.
Zeng Yali, Long Shengfang, Wu Mengmeng, et al. Reservoir prediction technique based on GeoEast seismic attribute analysis and its application in shale oil exploration and development in Huanxian[J]. Oil Geophysical Prospecting, 2022,57(S1):196-201.
[23] 赵贤正, 曾溅辉, 韩国猛, 等.渤海湾盆地黄骅坳陷板桥凹陷深层低渗透(致密)砂岩气藏充注特征及成藏过程[J].石油与天然气地质, 2020,41(5):913-927.
Zhao Xianzheng, Zeng Jianhui, Han Guomeng, et al. Charging characteristics and accumulation process of deep low-permeability(tight) sand gas reservoirs in Banqiao Sag, Huanghua Depression[J]. Oil & Gas Geology, 2020,41(5):913-927.
[24] 韩国猛, 刘炎鑫, 吴雪松, 等.中深层致密砂岩储集层成岩特征与孔隙演化定量研究：以沧东凹陷南皮斜坡孔店组二段为例[J].古地理学报, 2023,25(4):945-958.
Han Guomeng, Liu Yanxin, Wu Xuesong, et al. Quantitative study on diagenetic characteristics and pore evolution of middle-deep tight sandstone reservoirs: a case study of the second member of Kongdian Formation in Nanpi slope, Cangdong Sag[J]. Journal of Palaeogeography, 2023,25(4):945-958.
[25] 操应长, 远光辉, 杨海军, 等.含油气盆地深层—超深层碎屑岩油气勘探现状与优质储层成因研究进展[J].石油学报, 2022,43(1): 112-140.
Cao Yingchang, Yuan Guanghui, Yang Haijun, et al. Current situation of oil and gas exploration and research progress of the origin of high-quality reservoirs in deep-ultra-deep clastic reservoirs of petroliferous basins[J]. Acta Petrolei Sinica, 2022, 43(1):112-140.
[26] Bloch S, Lander R H, Bonnell L. Anomalously high porosity and permeability in deeply buried sandstone reservoirs: origin and predictability[J]. AAPG Bulletin, 2002,86(2):301-328.
[27] 李会军, 吴泰然, 吴波, 等.中国优质碎屑岩深层储层控制因素综述[J].地质科技情报, 2004,23(4):76-82.
Li Huijun, Wu Tairan, Wu Bo, et al. Distribution and controlling factors of high quality clastic deeply buried reservoir in China[J]. Geological Science and Technology Information, 2004,23(4):76-82.
[28] Neilson J E, Oxtoby N H, Simmons M D, et al. The relationship between petroleum emplacement and carbonate reservoir quality: examples from Abu Dhabi and the Amu Darya Basin[J]. Marine and Petroleum Geology, 1998,15(1):57-72.
[29] Sborne M J, Swarbrick R E. Diagenesis in North Sea HPHT clastic reservoirs-consequences for porosity and overpressure prediction[J]. Marine and Petroleum Geology, 1999,16(4):337-353.
[30] Mark, Wilkinson, David, et al. Secondary porosity generation during deep burial associated with overpressure leak-off; Fulmar Formation, United Kingdom Central Graben[J]. AAPG Bulletin, 1997,81(5):803-813.
[31] 周立宏, 肖敦清, 蒲秀刚, 等.陆相断陷湖盆复式叠合油气成藏与优势相富集新模式：以渤海湾盆地歧口凹陷为例[J].岩性油气藏, 2010,22(1):7-11.
Zhou Lihong, Xiao Dunqing, Pu Xiugang, et al. New pattern of composite superimposed reservoirs and advantageous phase accumulation in continental rifted lake basin: a case study from Qikou Sag of Bohai Bay Basin[J]. Lithologic Reservoirs, 2010,22(1):7-11.
[32] 田克勤, 李洪香.异常压力与深层油气藏：黄骅坳陷为例[J].勘探家, 1998,3(3):37-41.
Tian Keqin, Li Hongxiang. Abnormal pressures and deep reservoir-exemplified by Huanghua Depression[J]. Petroleum Explorationist, 1998,3(3):37-41.
[33] 李洪香, 任继红, 马建英, 等.异常高孔隙流体压力与碎屑岩深部油气藏[J].石油勘探与开发, 2001,28(6):5-8.
Li Hongxiang, Ren Jihong, Ma Jianying, et al. Abnormal high porefluid pressure and deep oil and gas pools of clastic rocks[J]. Petroleum Exploration and Development, 2001,28(6):5-8.
[34] 李明诚, 李剑.“动力圈闭”：低渗透致密储层中油气充注成藏的主要作用[J].石油学报, 2010,31(5):718-722.
Li Mingcheng, Li Jian.“Dynamic trap”: a main action of hydrocarbon charging to form accumulations in low permeability-tight reservoir[J]. Acta Petrolei Sinica, 2010,31(5):718-722.
[35] 周立宏, 何海清, 陈长伟, 等.歧口凹陷滨海斜坡深凹区海探1井东营组勘探突破与启示[J].中国石油勘探, 2023,28(6):78-89.
Zhou Lihong, He Haiqing, Chen Changwei, et al. Exploration breakthrough and enlightenment of Dongying Formation in Well Haitan 1 in the deep subsag area in Binhai slope, Qikou Sag[J]. China Petroleum Exploration, 2023,28(6):78-89.