鄂尔多斯盆地J县西南部地区延9和延10油层组储层特征研究

Study on Characteristics of Yan 9 and Yan 10 Reservoirs in the Southwest of J County in Ordos Basin

摘要: 通过对鄂尔多斯盆地J县西南部地区延安组延9、延10油层组砂岩岩矿特征分析表明：砂岩主要为长石砂岩和岩屑质长石砂岩；岩屑以沉积岩岩屑为主；砂岩中填隙物总含量相对较少，各填隙物含量之间存在差异，主要以泥质杂基和胶结物为主，胶结物中方解石含量最高。扫描电镜及铸体薄片分析表明，该区砂岩主要孔隙类型为粒间孔及粒内溶蚀孔隙。根据压汞参数分析，区内砂岩储集层孔隙结构具有较强非均质性，为中低孔、中渗储层。

Abstract: Based on the analysis of characteristics of sandstones of Yan 9 and Yan 10 Reservoirs in the Southwest of J County, the result showed that the sandstones were mainly feldspathic sandstone and lithic feldspathic sandstone; it was mainly sedimentary rock debris. The total contents of in-terstitial minerals in sandstone were relatively less, and there was difference between easy in-terstitial materials; it was mainly in argillaceous, miscellaneous matters and cement, and calcite content was the highest among them. According to the scanning electron microscope and cast thin section analysis, it is considered that the main pore types are intergranular pores and intragranular dissolution pores. According to the analysis of mercury injection parameters, it shows that the pore structure of sandstone reservoirs in the study area is strongly heterogeneous, which is a medium porosity and medium-low permeability reservoir.