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利用大量岩心、铸体薄片及物性资料,对安塞油田长4+5油层组砂岩的岩石学特征、成岩作用特征、孔隙类型及储层物性进行研究,并进一步分析了影响储层物性的主要因素。研究表明,储集层砂岩主要为长石细砂岩、岩屑长石细砂岩、细粉砂岩,孔隙主要是粒间孔-溶孔-微孔混合型;储集层砂岩孔隙度在9%～17%之间,渗透率在0.04～8.7×10-3μm2之间;储集层物性主要受沉积作用、成岩作用的影响。
Based on a large number of cores, cast thin sections and physical data, the petrological characteristics, diagenetic characteristics, pore types and reservoir physical properties of sandstones in Chang 4 + 5 reservoir of Ansai Oilfield were studied, and the main influencing factors on reservoir physical properties factor. The results show that the reservoir sandstones are mainly feldspar fine sandstone, feldspar feldspar fine sandstone and fine siltstone, and the pores are mainly intergranular pore-solution pore-micropore mixed type. The reservoir sandstone porosity is between 9% 17%, and the permeability is 0.04 ~ 8.7 × 10-3μm2. The reservoir physical property is mainly affected by sedimentation and diagenesis.