文章题目
Tectonics of the West and Central African strike-slip rift system
Li-Rong Dou, Kun-Ye Xiao, Ye-Bo Du, Sheng-Qiang Yuan, Li Wang, Xin-Shun Zhang, Tong-Fei Huang, Yi-Fan Song
作者简介
窦立荣，博士，教授级高级工程师，博士生导师。现任中国石油勘探开发研究院执行董事、院长、党委副书记；中国石油国际勘探开发有限公司党委委员、总地质师；国家油气战略研究中心主任。主要从事海外主要从事全球油气资源评价与海外重点领域油气勘探关键技术研究。
文章简介
走滑构造在多种构造背景中均有发育，然而当前的构造解析及研究多聚焦于汇聚 - 挤压背景，板内离散 - 伸展背景下的走滑构造体系研究则相对欠缺。文章聚焦中西非走滑构造体系展开研究，基于丰富的地震、测井、古生物等资料，揭示该体系由中非剪切带与东西两支裂谷盆地群呈 “N” 型构成，精准识别出转换伸展型和走滑诱导型伸展两类盆地，并详细剖析其构造演化差异，如转换伸展型盆地历经两期裂谷与白垩纪末反转，走滑诱导型盆地有三期裂谷和一期弱反转。该工作创新性提出中西非走滑构造体系为一种新型离散背景下的走滑断裂系统，学术上为理解冈瓦那超大陆裂解、走滑构造体系及伴生盆地演化提供关键范例，填补板内离散 - 伸展背景走滑构造研究空白。在社会价值方面，基于研究发现的盆地特征与油气关系，有力指导海外油气勘探，对保障能源供应、推动石油行业发展意义重大，有望助力中西非地区油气资源高效开发利用。
HIGHLIGHTS
A new strike-slip tectonic system in West and Central Africa.
This system forms under a divergent stress field.
This discovery contribute to understand Gondwana and oil exploration.
图1 中西非走滑裂谷系盆地分布
图2 早白垩世中西非离散型走滑裂谷系及盆地类型
ABSTRACT
It is essential to intensify research on the strike-slip tectonic system in West and Central Africa to better understand regional tectonic evolution and achieve future breakthroughs in oil and gas exploration. Based on the structural interpretation of extensive seismic data and stratigraphic paleontological analysis of more than 50 wells, this study investigated the tectonic history, sedimentary filling, and evolution of the rift basins in the West and Central Africa, and identified a novel type of intraplate strike-slip tectonic system. It exhibits the following characteristics: (i) the strike-slip tectonic system in the West and Central Africa consists of the Central African Shear Zone (CASZ) and two rift branches, manifesting as an N-shape; (ii) most of basins and rifts are characterized by rapid subsidence at one end and substantial sedimentary thickness; (iii) two types of strike-slip basins are developed, namely the transform-normal extensional basin (TEB) along CASZ and the strike-slip-induced extensional basin (SEB) at each end of CASZ; (iv) two types of basins display their own temporal and spatial evolution history. TEBs underwent two rifting stages during the Early and Late Cretaceous, with a strong inversion at the end of the Late Cretaceous. SEBs experienced three rifting stages, i.e., the Early Cretaceous, Late Cretaceous, and Paleogene, with a weak inversion; and (v) this strike-slip tectonic system was formed under intraplate divergent field, indicating a new type of system. This discovery enhances understanding of the breakup of Gondwana and provides valuable guidance for future oil and gas exploration.
出版信息
Dou L., Xiao K., Du Y., et al., 2024. Tectonics of the West and Central African strike-slip rift system. Pet. Sci. 21(6), 3742-3753.
原文信息
论文链接：
https://doi.org/10.1016/j.petsci.2024.11.017
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