大型走滑转换带对油气分布差异性控制作用: 以西非科特迪瓦盆地为例

饶勇; 程涛; 赵红岩; 李全; 吕彩丽; 刘正

doi:10.19509/j.cnki.dzkq.tb20230119

大型走滑转换带对油气分布差异性控制作用: 以西非科特迪瓦盆地为例

doi: 10.19509/j.cnki.dzkq.tb20230119

中国海洋石油国际有限公司, 北京 100028

基金项目:

中国海洋石油有限公司“十四五”重大科技项目“两岸一带”重点盆地油气富集规律和成藏差异性研究 KJGG2022-0901

详细信息

通讯作者:
饶勇, E-mail: raoyong@cnooc.com.cn

中图分类号: P618.13
计量
- 文章访问数: 115
- PDF下载量: 20
- 被引次数: 0
出版历程
- 收稿日期: 2023-03-07
- 录用日期: 2023-10-16
- 修回日期: 2023-10-12

Role of the large-scale strike-slip transform zone in controlling the differential hydrocarbon distribution: A case of the Côte d'Ivoire Basin in West Africa

CNOOC International Ltd., Beijing 100028, China

More Information

Corresponding author: RAO Yong, E-mail: raoyong@cnooc.com.cn

摘要

摘要:
科特迪瓦盆地位于西非赤道段, 发育大型走滑转换带, 为典型的转换型被动陆缘盆地, 是当前油气勘探热点区域, 勘探潜力巨大, 但油气平面分布、纵向富集均存在较大的差异性。基于前人研究, 利用井、震资料并结合近年来新发现油气藏数据, 重点从构造和沉积2个方面阐述了走滑转换带对油气分布差异性的控制作用。研究表明, 盆地经历了陆内裂谷、洋陆转换和被动陆缘3个主要的构造-沉积演化阶段, 形成了总体上"西窄东宽"的斧型构造格局特征, 西部为陡窄转换边缘, 东部为宽缓离散边缘, 中部为过渡边缘, 宏观上控制了油气"西少东多"的分布规律。走滑转换作用应力主要响应区为中部过渡边缘, 中部隆起马尾带发育大量的构造圈闭, 具有南北双向供烃特征, 控制了北部凸起阿尔比构造油气藏的形成与分布。走滑转换作用形成的古地貌对转换早期上阿尔比-森诺曼和转换晚期土伦阶储层的空间展布特征均有重要的控制作用, 内斜坡洼陷(盆地)往往是最为有利的富砂处, 同时也是最有利的地层-岩性圈闭发育区, 油气分布与沉积体系展布具有较好的一致性, 即转换控储, 分布控藏。
- 科特迪瓦盆地 /
- 转换型被动陆缘盆地 /
- 走滑转换带 /
- 转换边缘 /
- 离散边缘 /
- 过渡边缘
Abstract: Objective
The Côte d'Ivoire Basin, which is located in the equatorial section of West Africa and features large-scale strike-slip transform zones, is a typical transformed passive continental margin basin. This area is currently a hot spot for oil and gas exploration and has great exploration potential but has an uneven distribution of hydrocarbons both horizontally and vertically.
Methods
Based on previous results, well data, seismic data and new discoveries, this paper focuses on the differential controls of hydrocarbon distribution from two perspectives: structure and sedimentation.
Results
The results show that the basin has experienced three main tectonic-sedimentary evolution stages, namely, intracontinental rift, ocean-continent transition, and passive margin, forming the "narrow west-wide east" axe structure. The basin has a narrow and steep transform margin in the west, a wide and gentle divergent margin in the east, and a transitional margin in the central region, which controls the overall oil and gas distribution of "less in the west and more in the east" in macro-scale. The main response area of the strike-slip transformation stress in the central transitional margin and the central uplift developed many structural traps, which were sourced from both the northern and southern depression and ultimately controlled the distribution of the Albian oil and gas reservoirs.
Conclusion
The palaeomorphology formed by the strike-slip transform zone plays an important role in controlling the spatial distribution of both the Upper Albian-Cenomanian reservoirs in the early stage and the Turonian reservoirs in the late stage. The stepped or intra-slope ponds on slopes formed by strike-slip transform zone are often the most favourable sand-rich places and benefit stratigraphic-lithologic traps. Additionally, the distribution of oil and gas reservoirs has good consistency with the distribution of sedimentary systems; that is, the transformation controls the reservoirs, and the distribution controls the oil and gas reservoirs.
- Côte d'Ivoire Basin /
- transformed passive continental margin basin /
- strike-slip transform zone /
- transform margin /
- divergent margin /
- transitional margin
注释:

所有作者声明不存在利益冲突。

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图 1 科特迪瓦盆地构造位置图(a)和布格重力异常图(b)

Figure 1. Tectonic location (a) and bouguer gravity anomaly map (b) of the Côte d′Ivoire Basin

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图 2 科特迪瓦盆地综合柱状图

Figure 2. Comprehensive stratigraphic column of the Côte d′Ivoire Basin

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图 3 科特迪瓦盆地裂谷期构造单元划分平面图

Figure 3. Tectonic units division in rifting section of the Côte d′ Ivoire Basin

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图 4 科特迪瓦盆地边缘演化地质剖面示意图(左.转换边缘; 右.离散边缘，据文献[25]修改)

Figure 4. Evolution profile at margin of the Côte d′ Ivoire Basin

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图 5 科特迪瓦盆地中部过渡边缘典型地质剖面(a)(剖面A-A′位置见图 3)和WA油藏成藏模式图(b)(油藏位置见图 3)

Figure 5. Typical geological profile of the transitional margin in the central Côte d′Ivoire Basin (a) and hydrocarbon accumulation model of the WA oil reservoir (b)

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图 6 科特迪瓦盆地中部过渡边缘油气成藏模式图

Figure 6. Hydrocarbon accumulation model of the transitional margin in the central Côte d′ Ivoire Basin

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图 7 科特迪瓦盆地走滑转换带对沉积控制作用模式图

Figure 7. Sedimentary model controlled by strike-slip transform zone of the in the central Côte d′ Ivoire Basin

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图 8 科特迪瓦盆地中-东部地区沉积相图

Figure 8. Sedimentary facies map in the central-eastern Côte d′ Ivoire Basin

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图 9 科特迪瓦盆地转换晚期土伦时期沉积模式图

Figure 9. Turonian sedimentary model in the late transform stage of the Côte d′Ivoire Basin

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图 10 2种类型斜坡剖面及对应模式(a~d)和过Jubilee油藏典型地震剖面(e)(a~d图据文献[40-41]修改；e图中剖面B-B′位置见图 3，拉平土伦阶顶面)

Figure 10. Two types of slope profile and corresponding model (a-d) and typical reservoir seismic profile of the Jubilee reservoir (e)

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