渤中凹陷西洼古近系和新近系油气成藏差异对比

doi:10.12108/yxyqc.20250107

岩性油气藏 ›› 2025, Vol. 37 ›› Issue (1): 78–89.doi: 10.12108/yxyqc.20250107

渤中凹陷西洼古近系和新近系油气成藏差异对比

刘志峰¹, 朱小二¹, 柳广弟^2,3, 王祥^2,3, 李泽坤^2,3, 吴璇^2,3, 梁禹洋^2,3

1. 中海油研究总院有限责任公司, 北京 100028;
2. 中国石油大学(北京)油气资源与工程全国重点实验室, 北京 102249;
3. 中国石油大学(北京)地球科学学院, 北京 102249

收稿日期:2024-08-01 修回日期:2024-09-18 出版日期:2025-01-01 发布日期:2025-01-04
第一作者:刘志峰（1982—），男，硕士，高级工程师，主要从事中国近海石油地质条件及新区、新领域油气勘探。地址：（100028）北京市朝阳区太阳宫南街6号院中海油大厦A座。Email：liuzhf2@cnooc.com.cn。
通信作者: 王祥（1997—），男，中国石油大学在读博士研究生，研究方向为石油地质和油气成藏综合研究。Email:277624855@qq.com。
基金资助:
国家重点研发计划“深地资源勘查开采”（编号：2017YFC0603106）与中海石油（中国）有限公司北京研究中心委托课题“中国海域风险探区规模型油气资源勘探关键科学问题和创新技术研究”（编号：CCL2022RCPS2017XNN）联合资助。

Study on the difference of petroleum accumulation between Paleogene and Neogene in the western Bozhong Sag，Bohai Bay Basin

LIU Zhifeng¹, ZHU Xiaoer¹, LIU Guangdi^2,3, WANG Xiang^2,3, LI Zekun^2,3, WU Xuan^2,3, LIANG Yuyang^2,3

1. CNOOC Research Institute Co. Ltd., Beijing 100028, China;
2. National Key Laboratory of Petroleum Resources and Engineering, China University of Petroleum(Beijing), Beijing 102249, China;
3. College of Geosciences, China University of Petroleum(Beijing), Beijing 102249, China

Received:2024-08-01 Revised:2024-09-18 Online:2025-01-01 Published:2025-01-04

摘要/Abstract

摘要： 通过对渤中凹陷西洼的烃源岩生排烃史模拟、油源对比、油气充注史和断裂体系的分析，结合其构造演化史和控藏断层活动史，分析了其古近系和新近系油藏的油气来源、成藏时间以及不同类型断层的油气输导作用等。研究结果表明：①渤中凹陷西洼的古近系油气藏主要分布在北部陡坡带的东二段和东三段，而新近系油气藏在北部陡坡带、西部缓坡带和中央构造带的浅层馆陶组与明化镇组均有分布，中央构造带和西部缓坡带的新近系油气储量明显高于北部陡坡带。②渤中西洼油藏的主力烃源岩为沙一段、沙三段，而东三段烃源岩对北部陡坡带的油藏也有一定贡献，研究区存在3期油气成藏事件，其中第2期（10～5 Ma）和第3期（5 Ma～至今）占主导，沙河街组烃源岩在第1次大量生排烃期（30～20 Ma）生成的油气目前尚未发现。③研究区断层的断穿层位和形成时间对深浅层油气的差异富集具有明显的控制作用。浅层新近系油藏主要受控于新构造运动形成的沟通浅—中—深层的通源断层，沙河街组烃源岩生成的成熟油气通过多条长期活动性的断裂等输导体系进行运移；古近系东营组油藏主要受控于仅断至东营组的断裂体系，其油气主要来源于下伏沙河街组烃源岩和东营组三段烃源岩；深层沙河街组可能发育自生自储型油气藏，暂未获得勘探发现。

关键词: 通源断层, 盆地模拟, 成藏期次, 流体包裹体, 油源对比, 生物标志化合物, 沙河街组烃源岩, 新近系, 古近系, 渤中西洼

Abstract: Through the simulation of hydrocarbon generation and expulsion history of source rocks，oil-source correlation，petroleum filling history，and fault analysis of the western Bozhong Sag，Bohai Bay Basin，combined with the structural evolution history and controlling fault activity history，the petroleum origins，accumulation time，and the fault migration pathway system in the Paleogene and Neogene reservoirs in western Bozhong Sag were analyzed. The results shows that：（1）The Paleogene petroleum in the western Bozhong Sag is mainly concentrated in the reservoirs of the Oligocene Dongying Formation Mbrs 2 and 3（E₃d₂ and E₃d₃）of the northern steep slope zone，while the Neogene petroleum in the western Bozhong Sag is distributed in the shallow Guantao Formation and Minghuazhen Formation reservoirs of the northern steep slope zone，western gentle slope zone，and central structural zone. The petroleum reserves of the Neogene in the central structural zone and western gentle slope zone are significantly higher than those in the northern steep slope zone.（2）The significant source rocks of the western Bozhong Sag are the Shahejie Formation Mbrs 1 and 3（E₂s₁ and E₂s₃），while the source rocks of the E₃d₃ also contribute to the petroleum reservoirs in the northern steep slope zone. The accumulation of petroleum in the western Bozhong Sag can be divided into three stages. The discovered petroleum reservoirs mainly formed in two stages. The discovered petroleum reservoirs are mainly formed in the second stage（10-5 Ma）and the third stage（since 5 Ma）. The petroleum generated by the source rock of Shahejie Formation in the first large amount of hydrocarbon generation and expulsion period，between 30 and 20 Ma ago，remains undiscovered. The fault crossing layer and formation time of the fault have a significant controlling effect on the differential enrichment of petroleum in the deep and shallow layers.（3）The shallow Neogene oil and gas reservoirs in the research area are mainly controlled by the communication of shallow，medium，and deep through-source faults formed by neotectonic movements. Mature oil and gas generated by the Shahejie Formation source rocks are transported through multiple long-term active faults and other transport systems；The oil reservoirs of the Paleogene Dongying Formation are mainly controlled by a fault system that only extends to the Dongying Formation，and their oil and gas mainly come from the underlying source rocks of the Shahejie Formation and the third member of the Dongying Formation; The deep Shahejie Formation may develop self generating and self storing oil and gas reservoirs，but no exploration discoveries have been made yet.

Key words: through-source faults, basin simulation, accumulation period, fluid inclusions, oil-source correlation, biomarkers, source rock of Shahejie Formation, Neogene, Paleogene, western Bozhong Sag

中图分类号:

TE122.1

刘志峰, 朱小二, 柳广弟, 王祥, 李泽坤, 吴璇, 梁禹洋. 渤中凹陷西洼古近系和新近系油气成藏差异对比[J]. 岩性油气藏, 2025, 37(1): 78–89.

LIU Zhifeng, ZHU Xiaoer, LIU Guangdi, WANG Xiang, LI Zekun, WU Xuan, LIANG Yuyang. Study on the difference of petroleum accumulation between Paleogene and Neogene in the western Bozhong Sag，Bohai Bay Basin[J]. Lithologic Reservoirs, 2025, 37(1): 78–89.

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渤中凹陷西洼古近系和新近系油气成藏差异对比

Study on the difference of petroleum accumulation between Paleogene and Neogene in the western Bozhong Sag，Bohai Bay Basin

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