塔巴庙地区下二叠统气藏储层地质特征

RESERVOIR BED GEOLOGICAL CHARACTERISTICS OF LOWER PERMIAN GAS RESERVOIR AT TABAMIAO REGION

塔巴庙地区下二叠统是多砂层复合叠加连片 ,大面积含气的层位。二叠系山西组发育的三角洲平原分流河道砂体和下石盒子组发育的河流相砂体是天然气储集体。储集岩属低孔隙度特低渗透性储集岩 ,由于其分选差并且在早成岩作用期间强烈的机械压实作用使部分碎屑变形 ,孔隙度大大减小 ,储集空间主要为剩余粒间孔和晚成岩期形成的溶蚀孔隙等。但储集岩层数多 ,单层厚度大 ,分布面积广 。

The Lower Permian at Tabamiao region is a large area gas-bearing formation consisting of many sandbeds interconnected and superposed.The delta-plain distributary channel sandbodies in Shanxi Formation (Lower Permian) and the fluvial facies sandbodies in Shihezi Formation (Lower Permian) are the natural gas reservoir bodies at the region and their reservoir rock are characterized by low porosity and super-low permeability.Because of poor sorting and strong mechanical compaction during early diagenesis which ...