北部湾盆地福山凹陷流沙港组含油气系统特征

Characteristics of Liushagang Formation Petroleum System in Fushan Depression of Beibuwan Basin

福山凹陷是北部湾盆地南斜坡的一个箕状断陷 ,近年来 ,该凹陷取得丰富的油气发现。文章尝试应用含油气系统理论方法来解剖油气生成、运移、聚集和保存等成藏诸要素及其关系 ,深化福山凹陷油气富集特征认识。研究认为本区主要存在一套流沙港组含油气系统 ,该含油气系统平面上东、西、北受断裂控制 ,南部则受控于流二段剥蚀尖灭线。指出环白莲次凹的构造带和断裂带是主要的勘探地区 ,流三一亚段—流二段储盖组合是最有勘探潜力的组合。

Fushan Depression is a halfgraben-like depression in the south slope of Beibuwan Basin. More and more oil discovery is obtained these years. Oil generation, migration, accumulation and preservation are studied in this paper using theory of petroleum system. There is a set of system named Liushagang Formation Petroleum System. It is bounded by fault on the east, west and north, and on the south is bounded by erosion of 2nd member of Liushagang Formation(E 2l 2). We indicate that structural belt and fault zone around Bailian subdepression is the main exploration trend. E 2l 3 1 reservoire and E 2l 2 sealed assemblage of Liushagang Formation is the most exploration potential.