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研究定边地区长8油层组储层特征。以常规薄片、铸体薄片、粒度分析、扫描电镜、压汞等室内分析化验资料为基础,对储层岩石学特征、孔隙结构特征、物性分布特征进行研究。确定了定边地区长8油层组储层特征。研究区长8砂岩储层岩石类型为岩屑长石砂岩,以自生粘土矿物和碳酸盐胶结物为主;孔隙类型以溶蚀粒间孔最为发育,储层具有低排驱压力,较高中值压力,储集岩岩性致密,属于特低孔-超低渗储层。
Study on reservoir characteristics of Chang 8 reservoir in Dingbian area. The petrology, pore structure and distribution of physical properties of reservoirs are studied based on laboratory analysis data of conventional thin slices, cast thin slices, particle size analysis, SEM and mercury intrusion porosimetry. The reservoir characteristics of Chang 8 reservoir in Dingbian area were determined. The main rocks in the Chang 8 sandstone reservoir are feldspathic feldspathic sandstones, which are mainly composed of authigenic clay minerals and carbonate cements. The pore type is characterized by the most intergranular dissolution pores and the reservoirs with low row-pressure, high median Pressure, reservoir rock lithology, belonging to ultra-low porosity - ultra-low permeability reservoir.