【摘要】 综合利用铸体薄片、扫描电镜、X-衍射、阴极发光、高压压汞等方法,在系统分析了鄂尔多斯盆地东部太原组砂岩储层基本特征的基础上,对太原组进行了成岩相的划分以及深入探讨了成岩相与储层物性的关系。结果表明:研究区太原组储层岩性主要为岩屑石英砂岩和岩屑砂岩,具有明显的"富岩屑,贫长石"特征;填隙物主要为伊利石、高岭石、硅质和碳酸盐;孔隙类型主要为岩屑溶孔以及少量粒间溶孔和晶间孔;喉道以细孔-微细喉为主;储层属于典型的低孔-特低渗储层;太原组储层可划分为5种成岩相带,储层物性明显受成岩相的控制;伊利石胶结岩屑-粒间强溶蚀相,物性最好,是太原组最有利的成岩相带;伊利石+硅质胶结岩屑溶蚀相,物性较好;伊利石+高岭石胶结晶间微孔相,物性较差;碳酸盐胶结致密相和泥质胶结压实相,是太原组非储集成岩相带。更多还原

【Abstract】 Based on the analysis of the sandstone reservoir basic characteristics of Taiyuan formation of eastern Ordos Basin by the techniques of casting thin sections,scanning electron microscope,X-ray diffraction,cathode luminescence and high pressure mercury injection,the division of the diagenetic facies of Taiyuan formation was carried out and the relationship between diagenetic facies and reservoir physical property was discussed deeply. The results show that the lithology of Taiyuan formation are mainly lithic quartzite sandstone and lithic sandstone with characteristic of rich lithic and poor feldspar; The main cements are illite,kaolinite,siliceous cement and carbonate. The main pore. types are lithic dissolution pore and some intergranular dissolved pore and intercrystalline pore. Throat is tiny hole-microfine throat is prior. Reservoir belongs to the typical low hole-super low permeability reservoir; The diagenetic facies of Taiyuan formation is divided into five types in the study area,and the reservoir physical property is obviously controlled by the diagenetic facies; The illite cementation-lithic and intergranular strong dissolution facies is the best in physical property,thus which is the most favorable diagenetic facies of Taiyuan formation; The illite and siliceous cementation-lithic dissolution facies is good in physical property; The illite and kaolinite cementation-intercrystalline micropore facies is poor in physical property; The carbonate cementation-tight facies and the mud cementation-compacted facies,which are the diagenetic facies without reservoir property of Taiyuan formation.更多还原