西非加蓬盆地沉积特征及油气成藏规律研究  

STUDY OF THE SEDIMENTARY CHARACTERISTICS AND HYDROCARBON ACCUMULATION RULES FOR THE GABON BASIN,WEST AFRICA

作　　者：刘延莉[1] 邱春光 熊利平[3] 

机构地区：[1]中国石油大学,北京102249 [2]中海石油有限公司研究中心,北京100027 [3]中国石油化工股份有限公司石油勘探开发研究院,北京100083

出　　处：《石油实验地质》2008年第4期352-356,362,共6页Petroleum Geology & Experiment

摘　　要：通过对加蓬盆地区域构造背景、沉积演化的研究,综合分析生储盖条件,认为盆地演化经历了裂谷期、过渡期和漂移期3个阶段。各个演化阶段沉积地层3分:盐下层系、盐膏层和盐上层系。主要油气系统为盐下和盐上2套:盐上含油气系统主要分布于北加蓬次盆;盐下含油气系统分布于南加蓬次盆。搞清了盐下、盐上主要层系的沉积体系分布及其对烃源岩和储层的控制。总结出盐上成藏主控因素为"断崖控储,盐控圈闭,构造、圈闭控油";盐下成藏主控因素为"相控源、控储,盐控盖,构造、圈闭控油"。A comprehensive study of the regional tectonic setting, sedimentary evolution and source reservoir cap conditions indicates that the Gabon Basin has experienced 3 evolutional phases： rifting period, transitional period and drifting period. The sedimentary strata of every evolutional phase are divided into 3 parts, pre-salt sequence, salt sequence and post-salt sequence. The main petroleum systems are the pre-salt and post- salt sequences. The post-salt petroleum system is distributed on the North Gabon sub-basin and pre-salt one is located in the South Gabon sub-basin. It makes clear the main sedimentary distribution of pre-salt and post-salt sequences and their controlment on source rocks and reservoirs. This paper summarizes the main factors of post-salt reservoirs are ＂ reservoir controlled by fault scarp, traps controlled by salt, oil controlled by tectonic and traps＂ and the main factors of pre-salt reservoirs are ＂sources and reservoirs controlled by facies, caps controlled by salt, oil controlled by tectonic and traps＂.

关 键 词：沉积特征 盐上油气系统 盐下油气系统 成藏规律 加蓬盆地 西非 

分 类 号：TE122.3[石油与天然气工程—油气勘探]