鄂尔多斯盆地杭锦旗地区二叠系P_1x-s储层特征  

RESERVIOR CHARACTERISTICS OF THE P_1x-s FORMATION OF THE PERMIAN IN THE NORTHERN HANGJINQI AREA,ORDOS BASIN

作　　者：李德敏[1] 张哨楠[1] 

机构地区：[1]成都理工大学能源学院,四川成都610059

出　　处：《矿物岩石》2003年第2期94-97,共4页Mineralogy and Petrology

摘　　要：鄂尔多斯盆地北部伊盟隆起杭锦旗地区二叠系 P1 x - s直接覆盖在太古界变质结晶基底之上 ,为一套辫状河沉积和曲流河沉积砂岩。砂岩以岩屑砂岩为主。长石大部分蚀变为高岭石 ,但保持长石颗粒外形。由于压实作用和胶结作用的影响 ,砂岩中原生孔隙较少。孔隙以次生溶孔为主 ,由于长石含量低 ,粒内溶孔和铸模孔亦不发育 ,以粒间溶孔和溶蚀扩大孔为主。砂岩中不同产状的高岭石对储层孔渗的贡献不同。砂岩裂缝不发育 ,孔隙度和渗透率都较低 ,属中孔低渗的孔隙性储层。按储层分类的标准将本区储层划分为属 类和 类储层。The P 1 x - s Formation of Permian in the northern Hangjinqi area was characterized by major litharenite of braided river and meandering river facies,and overlain on the metamorphic crystalline basement of Archean.The primary pores in the litharenite were poorly developed due to the effect of compaction and cementation,and the secondary pores were mainly intergrain solution pores and solution enlargement pores with minor intragrain pores and cast solution pores.The underdeveloped fissures in the rocks led to the low porosity and permeability.Therefore,the reservior was classified as type Ⅱ and type Ⅲ and belonged to mid porosity,low permeability pore reservior.

关 键 词：鄂尔多斯盆地 杭锦旗地区 二叠系 太古界 变质结晶基底 砂岩 储层物性 渗透率 孔隙度 

分 类 号：P618.130.2[天文地球—矿床学] TE12[天文地球—地质学]