地质论评Issue(3)：599-613,15.DOI:10.16509/j.georeview.2015.03.013
鄂尔多斯盆地苏里格气田苏6区块二叠系下石盒子组8段砂岩储层致密成因模式
Densification Modes of Sandstone Reservoir in the 8th Member of the Lower Shihezi Formation,Permian,in Su-6 Area of Sulige Gas Field,Ordos Basin
摘要
Abstract
Densification modes of tight sandstone reservoir of the 8th Member of Lower Shihezi Formation, Permian,in Su -6 Area of the Sulige Gas Field,Ordos Basin,are quantitatively analysised by means of slice identification,scan electron microscope,electron probe micro -analysis and energy spectrum,homogenization temperatures and raman microprobe research of fluid inclusions.The results are as follows:(1 )Densification process can be divided into the following stages,compaction during early diagenesis and the 1st stage siliceous cementation→—the 2nd stage siliceous cementat ion and grain -coating chlorite→—the 1st stage dissolution (hydrocarbon charge →—) compaction during late diagenesis and the 3rd stage siliceous cementation (densification of reservoir )→—the 2nd stage dissolution and the 4th stage sil iceous cementation→—cementation and replacement of chlorite→—cementation and replacement of carbonate.(2)Densification modes of reservoir can be divided into three types:densification of medium -coarse grained litharenite by strong compaction;densification of medium -coarse grained lithic quartzarenite by strong siliceous cementation and medium to strong compaction;densification of fine grained (feldspathic ) litharenite by strong compaction and medium to strong siliceous cementation.(3)The main reasons for densification of reservoir are compaction and siliceous cementation.And the 2nd stage dissolution under enclosed environment has less ascension of porosity,which is another important reason for densification.(4)The two types of medium -coarse grained sandstones are densification after hydrocarbon charge,which experience injection of organic acid and make dissolved pore to be the major storage space.Fine grained (feldspathic)litharenite is densification before hydrocarbon charge,which experience weak dissolution. (5)Difference of densification modes lead to the porosity,permeability ,correlation of permeability and porosity of medium -coarse grained sandstone are significantly higher than that of fine grained sandstone.关键词
鄂尔多斯盆苏里格气田/盒 8 段(二叠系下石盒子组 8 段)/砂岩储层/致密化过程/致密化模式Key words
Sulige Gas Field,Ordos Basin/the 8th Member of the Lower Shihezi (Xiashihezi)Formation, Permian/sandstone reservoir/densification process/densification modes引用本文复制引用
毕明威,刘金,陈世悦,周兆华,郑国强,张满郎,高立祥,钱爱华,谷江锐,石石..鄂尔多斯盆地苏里格气田苏6区块二叠系下石盒子组8段砂岩储层致密成因模式[J].地质论评,2015,(3):599-613,15.基金项目
本文为国家科技重大专项“致密砂岩气有效开发评价技术”（编号2011ZX05013-002）的成果。 （）
