摘要
下刚果盆地位于西非海岸,为一中生代裂谷与被动大陆边缘叠合盆地.盆地被阿普特期盐岩分为盐上及盐下构造层,上下两层构造特征差异明显.盐下以早期裂陷晚期坳陷为特征,盐上地层受盐岩运动和构造背景的双重影响,由东到西分为拉张带、过渡带及挤压带.盆地目前已证实的重要的成藏组合有三套,即盐下裂谷成藏组合、盐下-盐上成藏组合与第三系成藏组合.综合分析认为水深大于2000m深水区是盐上浊积砂体潜力最大的地区,浅水地区为盐上碳酸盐岩潜力区,而大西洋枢纽带两侧为盐下勘探潜力区.
Lower Congo Basin,which is located in West Africa coast,is a superimposed basin of a continental rift basin and a passive continental margin basin.The basin is divided to pre-salt and post-salt tectonic layers by Aptian salt and two layers are of obvious differences in structural characteristic. Pre-salt structure is characterized by early rift and late depression.Post-salt structure is affected by salt movement and tectonic background,with a division of extensional,transitional and compressive belt from east to west.In present three important plays have been proved,which are pre-salt play,pre-salt and post-salt play and Tertiary play.Integrated geological analyses show that the exploratory potential area of turbidite sand of post-salt is the deep-water region with water depth over 2000m,that of carbonate of post-salt is shallow water region and that of pre-salt is lateral Atlantic hinge zone.
出处
《地球物理学进展》
CSCD
北大核心
2012年第6期2585-2593,共9页
Progress in Geophysics
基金
国家油气专项子专题"全球主要地质时期原型盆地形成演化研究"(2011ZX05005-004-HZ06
2011ZX05009-002)资助
关键词
下刚果盆地
盐岩
地震
构造特征
勘探潜力
Lower Congo Basin
salt
seismic data
structural characteristic
exploratory potential
