松辽盆地深层箕状断陷岩性气藏成藏规律分析——以王府断陷为例  

Gas accumulation in lithologic reservoirs of deep half-graben rift in Songliao Basin:a case of Wangfu Fault Depression

作　　者：代登亮 董清水[1,2] 任燕宁 王继远[1] 刘哲[1] 张航[1] 

机构地区：[1]吉林大学地球科学学院,长春130061 [2]吉林大学吉林省油页岩及共生能源矿产重点实验室,长春130061

出　　处：《世界地质》2015年第4期1052-1060,共9页World Geology

基　　金：中国地质调查局项目(12120115001701--2;12120115001001--09)联合资助

摘　　要：地震、钻探及测试资料综合分析表明,王府断陷气藏类型主要以火山穹窿构造-岩性型、砂岩上倾尖灭型及透镜型岩性气藏为主。内部具有储集区段的火山穹窿与火石岭组或沙河子组烃源岩构成有利的生储盖组合是火山穹窿构造--岩性气藏形成的基础;同沉积控盆断裂边缘扇三角洲上倾尖灭舌状砂体与优质烃源岩指状交互是上倾尖灭岩性气藏形成的主要条件;沙河子组烃源岩包裹火石岭组松散火山锥体垮塌重力流是构成透镜型岩性气藏的关键要素。并概括出了王府断陷成藏模式,指出断陷斜坡区是上倾尖灭岩性气藏有利成藏带,次级凸起区是火石岭组火山穹窿构造-岩性气藏与沙河子组透镜型岩性气藏的叠合发育带,与次级洼槽相邻的隆起边缘区易于形成火山穹窿气藏。Seismic,drilling and testing data analyses indicate that the gas reservoir types of Wangfu Fault Depression mainly include the volcanic dome-lithological type,sandstone on the tip off type and lens type. The volcanic dome inside which has reservoir section together with the source-rock of Huoshiling or Shahezi Formation constituted beneficial source-reservoir-seal assemblage,which is the basis of volcanic dome structural-lithologic gas reservoir. The finger-like interaction between fan delta updip pinchout lobate sand body of synsedimentary fault boundary and high-quality source rock is essential to the formation of updip pinchout lithologic gas reservoirs. The source-rock of Shahezi Formation which enveloped the collapsed gravity flow of loose volcanic cone in Huoshiling Formation is the key factor of forming lens-shaped lithologic gas reservoirs. Furthermore,this paper summarized the gas accumulation mode of Wangfu Fault Depression,and points out that the faulted slope area is the favorable accumulation region of updip pinchout lithologic reservoirs,and the secondary uplift area is superimposed accumulation zones of volcanic dome structure-lithologic gas reservoirs of Huoshiling Formation and lens lithologic gas res-ervoirs of Shahezi Formation. It is the adjacent raised edge zone of the secondary depression groove that tends to form volcanic dome gas reservoirs.

关 键 词：松辽盆地 王府断陷 岩性气藏 成藏控制因素 成藏规律 

分 类 号：P618.130.2[天文地球—矿床学]