西非中南段盐盆成藏组合及油气勘探方向  

Play analysis and exploration direction of the Aptian Salt Basins of West Africa

作　　者：徐志诚 吕福亮 范国章 毛超林 王红平 

机构地区：[1]中国石油杭州地质研究院,浙江杭州310023

出　　处：《地学前缘》2014年第3期72-81,共10页Earth Science Frontiers

基　　金：国家油气重大专项(2011ZX05028-001);中国石油天然气股份有限公司科技重大专项(2013E-0501)

摘　　要：以板块构造理论和石油地质学理论为基础,分析西非中南段盐盆形成演化、成藏组合特征,提出中南段盐盆油气勘探方向。西非中南段盐盆的形成演化可以分为前裂谷、同裂谷、过渡和后裂谷4个阶段。受盆地形成演化的控制,中南段盐盆总体发育盐下下白垩统、盐上下白垩统、上白垩统和第三系共4套储盖组合。以储盖组合为核心,根据成藏组合划分原则,在中南段盐盆5个盆地共划分出16套成藏组合。综合分析各盆地勘探现状、油气地质条件和勘探潜力后,提出中南段盐盆未来勘探以深水区勘探为主,其中下刚果盆地和杜阿拉盆地应重点关注第三系成藏组合,加蓬盆地应重点关注盐上上白垩统成藏组合和盐下下白垩统成藏组合,宽扎盆地应重点关注盐下下白垩统成藏组合,里奥穆尼盆地应重点关注上白垩统成藏组合。On the basis of plate tectonic theory and petroleum geologic theory, this paper summarizes basin evolution, analyzes plays, and discusses exploration direction of the Aptian Salt Basins of West Africa. The evolution of the Aptian Salt Basins can be divided into pre-rift stage, syn-rift stage, transitional stage, and post-rift stage. Controlled by the evolution of the basins, 4 reservoir-seal assemblages are developed in the Aptian Salt Basins： pre-salt Lower Cretaceous assemblage, post-salt Lower Cretaceous assemblage, Upper Cretaceous assemblage, and Tertiary assemblage. On the basis of reservoir-seal assemblages, 16 plays have been divided in 5 Aptian Salt Basins. Analytical results of exploration situation, petroleum geology and exploration potential indicate that the deepwater province of the Aptian Salt Basins is petroliferous and is the most favorable area for future exploration. The Tertiary play is the most important target of future exploration in the Lower Congo Basin and Douala Basin, whereas Upper Cretaceous play and pre-salt Lower Cretaceous play are the most important targets of future exploration in the Gabon Coastal Basin. Pre-sah Lower Cretaceous play is the most important target in the Kwanza basin and Upper Cretaceous play is the most important target in the Rio Muni Basin.

关 键 词：西非 盐盆 成藏组合 勘探方向 深水 浊积岩 

分 类 号：P618.13[天文地球—矿床学]