Gas Accumulation Mechanism in East Africa Coastal Key Basins

被引：2
|
作者：
Liang J. [1 ]
Kong L. [1 ]
Qiu C. [1 ]
Li H. [2 ]
Jia S. [1 ]
Long X. [1 ]
机构：
[1] CNOOC International Ltd., Beijing
[2] School of Geosciences, Yangtze University, Wuhan
来源：
Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2021年 / 46卷 / 08期
关键词：
Accumulation model; Fault type; Gas source; Oil and gas migration; Petroleum geology; Source rock; Turbidite sand;
D O I：
10.3799/dqkx.2020.264
中图分类号：
学科分类号：
摘要：
East Africa coastal basins are prolific in natural gas resources and are the hot spots of natural gas exploration in the world. The natural gas in the key East Africa coastal basins is sapropelic thermal gas, which mainly sourced from Lower Jurassic restricted marine high-quality source rocks. Large faults controlled the vertical migration of natural gas in the key East Africa coastal basins, where mainly developed large extensional faults and large strike-slip faults. The large strike-slip faults were main migration pathway of natural gas in the south of Tanzania Basin. Their main active period was from Late Cretaceous to Paleocene, which controlled the gas migration of the Cretaceous-Paleogene gas-bearing turbidite sandstone, while extensional faults were the main migration pathway of natural gas in Ruvuma Basin. Their main active period was Paleocene, Oligocene and Neogene, which controlled the gas migration of Paleogene gas-bearing turbidite sand stone. The type and size of turbidite sand controlled the size of lithological or structure-lithological trap in deepwater, and which in turn controlled the size of natural gas field. Due to the different migration modes of natural gas, East Africa coastal basins formed large strike-slip fault controlling accumulation model and large extensional fault controlling accumulation model. © 2021, Editorial Department of Earth Science. All right reserved.
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页码：2919 / 2933
页数：14
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