鄂尔多斯盆地卢家畔地区长2油层组储层孔隙结构特征

摘要

对卢家畔地区长2油层组油层组的铸体薄片、扫描电镜、物性分析和高压压汞资料的分析表明:研究区长2岩石类型主要为长石砂岩;储层孔隙度为12.5%,渗透率为3.6 mD,为低孔、低渗储层.残余原生粒间孔和次生溶孔为主要孔隙类型;孔喉结构为中孔-细喉型、细孔-微喉型.可将其分为3 类,研究区主要的孔隙结构类型为Ⅰ类和Ⅱ类.%The analysis of the casting thin slice,scanning electron microscope,physical property analysis and high pressure mercury pressure data of Chang 2 oil layer group in Lujia Bank show that the main type 2 rock types in the study area are mainly feldspar sandstone,the porosity of the reservoir is 12.5% and the permeability is 3.6 mD,which is low porosity and low permeability reservoir. The residual primary intergranular pores and secondary dissolved pores are the main pore types,and the pore throat structures are mesoporous to fine throat type and pore to micro throat type. It can be divided into 3 categories. The main pore structure types in the study area are class Ⅰand class Ⅱ.