Hydrocarbon accumulation in deep water areas of Angola in West Africa

作     者：Yanqing Huang Lei Zheng 

作者机构：SINOPEC Exploration&Production Research InstituteBeijing100083China 

出 版 物：《Petroleum Research》 (石油研究（英文）)

年 卷 期：2019年第4卷第3期

页      面：268-275页

核心收录：

学科分类：081803[工学-地质工程] 0709[理学-地质学] 0819[工学-矿业工程] 0808[工学-电气工程] 08[工学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0807[工学-动力工程及工程热物理] 0816[工学-测绘科学与技术] 

基　　金：supported by Project of SINOPEC Science and Technology Department(P12053). 

主　　题：Angola Lower CongoeCongo fan basin Source rocks Hydrocarbon geochemistry Accumulation model 

摘      要：Through comprehensive analysis of source rocks and hydrocarbon geochemical data of several offshore blocks in Angola,two sets of source rocks in the Cretaceous Iabe Formation and Lower Oligocene Malembo Formation are developed in the suprasalt structures in deep water area.The source rocks in the Cretaceous Iabe Formation is dominated by Type I kerogen,while the source rocks in the Lower Oligocene Malembo Formation is dominated by Type IIeIII kerogen which mainly generate gas.In the extensional zone,the source rocks in the Malembo Formation are mature and the source rocks in the Iabe Formation are post-matured;this zone undergo multi-stage filling,and the Oligocene paleoreservoirs experience high-temperature pyrolysis to form gas reservoirs;the Upper Miocene reservoirs undergo biodegradation due to poor storage condition.In the transitional zone,oil and gas in the drape anticline area are mainly from the Iabe Formation,and it mix with a small amount of oil and gas from the Malembo Formation in the later stage.In the compression zone,the crude oil is from the Iabe Formation at the mature stage,and contains a small amount of dissolved gas generated by thermal degradation.