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利用研究区内岩石薄片、铸体薄片、高压压汞以及物性特征等资料,对鄂尔多斯盆地吴起油田长8储层的岩石学特征、孔隙结构及类型、孔渗特征等进行深入研究,并对影响储层物性的因素做了研究。研究表明:研究区长8储层以细粒长石砂岩为主,其次为岩屑长石砂岩;填隙物主要是水云母和铁方解石;主要发育溶蚀孔隙,特别是溶蚀粒间孔;喉道类型主要为微细喉、微喉。沉积作用控制了储层砂体展布,压实作用和胶结作用是造成储层孔隙破坏的主要因素,溶蚀作用对储层物性起到改善的作用。
The petrological characteristics, pore structure and type, porosity and permeability of Chang 8 reservoir in Wuqi Oilfield, Ordos Basin, are studied by using the data of rock slices, cast thin sections, high pressure mercury intrusion and physical properties in the study area. The physical properties of the reservoir have been studied. The results show that the Chang 8 reservoirs are dominated by fine-grained feldspathic sandstones, followed by lithic feldspar-feldspar sandstones; the interstitials are mainly aquiferous micas and iron calcites; and mainly are dissolved pores, especially intergranular pores; Road types are mainly fine throat, throat. Sedimentation controls the distribution, compaction and cementation of the reservoir sandstones, which are the main factors that cause pore damage in the reservoirs. The dissolution plays an important role in improving reservoir physical properties.