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渤海西部海域新生代盖层特征及对油气的控制作用
(1.中国地质大学(北京)能源学院, 北京 100083;2.中国地质大学(北京)海洋学院, 北京 100083;3.中海石油(中国)有限公司天津分公司, 天津 300452)
CHARACTERISTICS OF THE CENOZOIC CAP ROCK AND ITS CONTROL ON HYDROCARBON IN THE WESTERN BOHAI SEA AREA
(1.School of Energy Resources, China University of Geosciences(Beijing), Beijing 100083, China;2.School of Ocean Sciences, China University of Geosciences(Beijing), Beijing 100083, China;3.Tianjin Branch, China National Offshore Oil Corporation, Tianjin 300452, China)
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投稿时间:2018-05-03    修订日期:2019-01-26
中文摘要: 渤海西部海域新生代盖层发育情况与油气富集密切相关。利用渤西地区丰富的钻井资料、测井资料、取心分析化验资料等对研究区新生代盖层发育特征、封闭性及其对油气成藏的控制作用开展了研究。研究结果表明,该区主要发育东二段下部、明下段下部及明下段上部3套区域泥质岩盖层,东二段下部区域泥岩盖层相比于明下段两套区域泥岩盖层具有单层泥岩厚度大、色暗、质纯、高泥地比、横向分布稳定及更高成岩阶段等特点,东二段下部泥岩盖层封闭性好于明下段泥岩盖层;东二段下部区域泥岩盖层控制了油气在凹陷区域深部沙河街组、东营组的聚集成藏并决定了油气朝沙垒田古隆起上倾方向运移,明化镇组下段区域"终极盖层"与断裂共同作用控制了整个渤西地区新近系的油气富集程度;提出了"周边凹陷东二下区域泥岩盖层底面构造脊输导体系"、"凸起斜坡及内部明下段泥岩盖层、断裂‘耦合’油气输导体系"两种区域盖层控制下的油气输导模式。
Abstract:The development of the Cenozoic cap rock in the western Bohai sea area is closely related to hydrocarbon accumulation. In order to clarify the control of cap rock on hydrocarbon enrichment, based on the drilling data, logging data and coring analysis data, the development characteristics of the Cenozoic cap rock and the sealing capacity were studied in the western Bohai sea area. The results show that:three sets of regional mudstone cap rocks are recognized in the study area, which are lower second member of the Dongying Formation(E3d2L), lower of the lower Minghuazhen Formation(N2mL), and upper of the lower Minghuazhen Formation. Compared with two sets of mudstone cap rocks in N2mL, the mudstone cap rock in E3d2L has the characteristics of large thickness, dark color, pure quality, high mud-land ratio, more stable lateral distribution and higher diagenetic stage. The mudstone cap rock of E3d2L has better sealing ability than the N2mL. Hydrocarbon accumulation and distribution in the Dongying Formation and the Shahejie Formation are controlled by E3d2L regional cap rock, which drives the migration of hydrocarbon toward the updip side of the Shaleitian paleo uplift. The "ultimate caprock" of N2mL and faults control the degree of hydrocarbon enrichment of Neogene in the western Bohai sea area. Two kinds of regional cap rock-controlled conduction modes, "the structural ridge transport system of mudstone cap rock in E3d2L around depression" and "the hydrocarbon migration system of mudstone cap rock and fault interaction on uplift slope and above in N2mL", are proposed.
文章编号:     中图分类号:P618.13    文献标志码:
基金项目:国家自然科学基金项目(91328201);国家科技重大专项(2011ZX05023-002-004)
引用文本:
张正涛,林畅松,李慧勇,张国坤,代江林.渤海西部海域新生代盖层特征及对油气的控制作用[J].地质力学学报,2019,25(3):357-369DOI:10.12090/j.issn.1006-6616.2019.25.03.033
ZHANG Zhengtao,LIN Changsong,LI Huiyong,ZHANG Guokun,DAI Jianglin.CHARACTERISTICS OF THE CENOZOIC CAP ROCK AND ITS CONTROL ON HYDROCARBON IN THE WESTERN BOHAI SEA AREA[J].,2019,25(3):357-369DOI:10.12090/j.issn.1006-6616.2019.25.03.033

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