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通过铸体薄片、扫描电镜及物性资料分析,深入研究鄂尔多斯盆地槐60井区长6储层的岩石学特征、孔渗特征、孔隙结构及孔隙类型等,并分析储层储集性能的主要影响因素。研究表明,长6储层具有矿物成分成熟度低而结构成熟度较高的岩石学特点,残余粒间孔和溶蚀孔隙最为发育,孔隙结构类型主要为小孔细喉型、小-细孔细喉型、细孔-细喉-微喉型和微孔-微喉型四种类型。平面上储层物性受沉积相带的控制,垂向上受成岩作用控制,压实和胶结作用使储层物性变差,而溶蚀作用产生次生孔隙是物性得到改善。另外,微裂缝亦改变了储层渗透能力,使油井具有高产的可能。
Through the analysis of cast thin slice, scanning electron microscope and physical data, the petrological characteristics, porosity and permeability characteristics, pore structure and pore type of Chang 6 reservoir in Huai 60 well area in Ordos Basin are analyzed deeply and the main effects of reservoir properties are analyzed factor. The results show that the Chang 6 reservoir has the characteristics of low maturity and high structural maturity. The residual intergranular pores and dissolved pores are the most developed, and the pore structure types are mainly small pore throat type, small-fine pore size Throat type, pore - throat - micro throat type and micropore - micro throat type four types. Physical properties of reservoirs are controlled by sedimentary facies in the plane and are controlled by diagenesis in the vertical direction. Compaction and cementation make the reservoir physical properties deteriorate, and secondary porosity caused by dissolution can improve physical properties. In addition, microcracks also change the permeability of reservoirs, making it possible for oil wells to have high yields.