西非海岸盆地油气成藏主控因素及勘探潜力

POOL FORMING CONSTRAINS AND THE HYDROCARBON EXPLORATION POTENTIAL OF THE WEST AFRICA COAST BASINS

林卫东 陈文学 熊利平 高宇庆

Lin Weidong Chen Wenxue Xiong Liping Gao Yuqing

中国地质大学, 博士后流动站, 北京, 100083 2. 中国石油化工股份有限公司, 石油勘探开发研究院, 北京, 100083

China University of Geosciences, Beijing 100083, China 2. Exploration and Production Research Institute, SINOPEC, Beijing 100083, China

西非海岸盆地群是典型的裂谷和被动陆缘叠合盆地,盆地经历了前裂谷阶段、同裂谷阶段、过渡阶段和被动大陆边缘阶段等4个演化阶段;发育盐下裂谷期湖相泥岩和盐上海相页岩2套主力优质烃源岩,油气主要富集在第三系广泛发育的滚动背斜和盐岩相关构造圈闭内的三角洲、水下扇碎屑岩储层中。西非海岸盆地中段的尼日尔三角洲盆地深水部分第三系成藏组合,下刚果盆地深水—超深水区盐相关构造是西非未来最有勘探潜力的地区,西非南北2段低勘探程度地区有一定的勘探潜力。

The West Africa coast basins are typical rift and passive margin basins which had experienced four tectonic evolution periods of pre-rift,syn-rift,transition and passive margin.Pre-salt lacustrine shale and post-salt shallow marine shale were the main source rocks in the basins.Hydrocarbon was mainly accumulated in deltaic and subfan clastics of the Tertiary rollover anticline and salt structural traps.The deep water Tertiary play of the Niger delta and salt related structures within deep and ultra deep water area in Lower Congo Basin are two areas with high hydrocarbon potential.Basins with low oil and gas exploration in the north and the south of the West Africa coast have certain hydrocarbon potential.

中国石化科技项目(JP06001)

https://doi.org/10.11781/sysydz200805450