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利用岩心、铸体薄片、扫描电镜等多种资料和分析测试方法,对鄂尔多斯盆地长4+5油层物性特征、岩石学特征、孔隙结构特征进行综合研究,从而研究其主控因素。研究结果表明:本区长4+5储层岩性主要为细粒长石砂岩,粒内溶孔及铸模较为发育,晶间微孔、晶内微孔次之;孔隙结构复杂,储层非均质性较强,物性较差,属于中小孔微细喉型低渗、特低渗储层。储层物性主要受沉积作用、成岩作用的影响。
Based on a variety of data and analysis methods such as core, cast thin film, scanning electron microscopy and other methods, the physical characteristics, petrological characteristics and pore structure of Chang4 +5 oil layer in Ordos Basin are comprehensively studied to study the main controlling factors. The results show that the lithology of 4 + 5 reservoirs in this area are mainly fine-grained feldspathic sandstones. The intragranular dissolution pores and molds are well developed, with intergranular micropores and microscopic pores within the pores. The pore structure is complex, Strong homogeneity, poor physical properties, belonging to the microporous microporous low permeability, ultra-low permeability reservoir. Reservoir properties are mainly affected by sedimentation and diagenesis.