北加蓬次盆白垩系盐构造发育特征及成因分析  

Genesis and distribution of Cretaceous salt structures in North Gabon Subbasin

作　　者：徐睿[1] 奥立德[2] 

机构地区：[1]中国石化石油勘探开发研究院 [2]中国石化江苏油田分公司勘探开发研究院

出　　处：《中国石油勘探》2016年第5期70-74,共5页China Petroleum Exploration

基　　金：中国石化国际石油勘探开发研究项目"加蓬AKADO油田滚动增储潜力研究"(SG-S-2014-05)

摘　　要：北加蓬次盆属于裂谷盆地与被动大陆边缘盆地叠加的复合型盆地,发育大量盐构造。通过分析研究区盐构造在地震剖面上的分布形态,认为研究区下白垩统Ezanga组沉积有巨厚的岩盐层,发育了龟背状构造、楔形底辟、大型底辟等盐构造,并且不同的盐构造类型具有不同的形成应力环境;通过已发现油气藏的分布规律分析,认为与盐构造有关的盐上背斜及浊积体在泥岩封堵形成的岩性圈闭控制了油气的聚集。The North Gabon Subbasin is a composite basin with rift basin and passive continental margin basin superimposed, where a large number of salt structures are developed. Based on the distribution pattern of salt structures in seismic profiles, it is considered that the study area has very thick salt rocks deposited in the Lower Cretaceous Ezanga Formation, and multiple salt structures such as turtleback structure, wedge-shaped diaper and large diaper. Different types of salt structures correspond to different formation stress environments. Based on the distribution regularity of discovered oil and gas reservoirs, it is indicated that the presalt anticline related to salt structure and the lithological traps formed due to turbidite sealing on mudstone control hydrocarbon enrichment.

关 键 词：盐构造 油气藏 白垩系 加蓬 海岸盆地 

分 类 号：TE111.2[石油与天然气工程—油气勘探]