| 转换大陆边缘盆地深水浊积砂岩油气成藏差异性研究 |
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| 引用本文： | 孔令武,赵红岩,梁建设,程涛,王嘉,赵佳奇,喻英梅.转换大陆边缘盆地深水浊积砂岩油气成藏差异性研究[J].沉积学报,2022,40(1):244-254. |
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| 作者姓名： | 孔令武 赵红岩 梁建设 程涛 王嘉 赵佳奇 喻英梅 |
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| 作者单位： | 中海油国际有限公司，北京 100028 |
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| 基金项目： | 非洲重点区油气勘探潜力综合评价(2017ZX05032-002)~~。 |
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| 摘 要： | 深水浊积砂岩油气藏是当今世界油气勘探的热点领域。基于地震、钻井、地球化学等资料，系统分析了西非北段科特迪瓦盆地深水浊积砂岩油气成藏的差异性。研究表明，科特迪瓦盆地经历了裂陷期（早白垩世）和漂移期（晚白垩世—现今）两大构造演化阶段，漂移期发育塞诺曼—土伦阶优质海相烃源岩，裂陷期发育阿普特—阿尔布阶湖相烃源岩。漂移期层系为盆地的主力勘探层系，发育两种类型的浊积砂岩油气藏。塞诺曼—土伦阶浊积砂岩油气藏为典型的“砂体运移、自生自储、源内成藏”的油气成藏模式，其油气主要来源于塞诺曼—土伦阶烃源岩，广泛分布的浊积砂岩是油气运移的主要路径，烃源岩的生、排烃期决定了油气成藏时期，是否发育有效烃源岩是该类油气藏成藏的主控因素。圣通—马斯特里赫特阶浊积砂岩油气藏为典型的“断裂运移、下生上储、源外成藏”的油气成藏模式，其油气主要来源于深部裂陷期阿普特—阿尔布阶湖相烃源岩，断裂是油气运移的主要路径，断裂的活动控制了油气的运移和成藏时期，是否发育油源断裂是该类油气藏成藏的主控因素。
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| 关 键 词： | 烃源岩 油气来源 运移路径 成藏模式 主控因素 深水浊积砂岩 |
| 收稿时间： | 2020-05-25 |
Differencesin Hydrocarbon Accumulation of Deep?water TurbiditeSandstone in a Transform Continental MarginBasin: A case study of C?te d’Ivoire Basin,West Africa |
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| KONG LingWu,ZHAO HongYan,LIANG JianShe,CHENG Tao,WANG Jia,ZHAO JiaQi,YU YingMei.Differencesin Hydrocarbon Accumulation of Deep?water TurbiditeSandstone in a Transform Continental MarginBasin: A case study of C?te d’Ivoire Basin,West Africa[J].Acta Sedimentologica Sinica,2022,40(1):244-254. |
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| Authors: | KONG LingWu ZHAO HongYan LIANG JianShe CHENG Tao WANG Jia ZHAO JiaQi YU YingMei |
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| Affiliation: | CNOOC International Ltd. , Beijing 100028, China |
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| Abstract: | Deep-waterturbidite is the main focusof current world petroleum exploration. Based on seismic data，well data and geochemical data， the difference of hydrocarbon accumulation of deep-water turbidite sandstone in the C?te d’Ivoire Basin was comprehensively analyzed.The research showed that the C?te d’Ivoire Basin developed a rifting period（Lower Cretaceous） and a drift period（Upper Cretaceous?present）.High-quality marine source rock was developed in the Cenomanian?Turonian， and lacustrine source rock was developed in the Aptian?Albian. The drift sequence is the main exploration target of the basin. Two types of turbidite sandstone hydrocarbon accumulations were developed.Cenomanian?Turonian turbidite sand accumulations were characterized by“migration along sand，self-generation and self-storage， accumulation in source”. The hydrocarbon of the accumulations is mainly sourced from Cenomanian?Turonian source rock.The extensively distributed turbidite sand was the hydrocarbon migration pathway.The expulsiontime of the source rock controlled the hydrocarbon accumulation period.Whether mature source rock existed is the main controlling factor for theaccumulation type.Santonian?Maastrichtian turbidite sandstone accumulations were characterized by“migration along fault，lower-generation and upper-storage，accumulation out of source”. The hydrocarbons of Santonian?Maastrichtian turbidite sandstone accumulations were mainly sourced from Aptian?Albian lacustrine source rocks during the rifting period， with faults beingthe main pathway of hydrocarbon migration. The active period of faults controlled the migration and accumulation time of oil and gas. Whether faults existed is the main controlling factor for this type of accumulation. |
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| Keywords: | source rock oil and gas source migration pathway accumulation mode controlling factor deep-water turbidite sandstone |
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