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通过观察岩石及铸体薄片和常规物性分析等方法,对鄂尔多斯盆地镇北地区长4+5油层组储层砂体的岩石学特征、成岩作用、储集类型和主要控制因素进行了分析。研究表明:长4+5油层组储层砂体的孔隙主要以粒间孔和长石溶孔为主,粒间溶孔次之;成岩作用包括建设性成岩作用和破坏性成岩作用,建设性成岩作用包括溶蚀作用、绿泥石黏土膜形成作用,破坏性成岩作用包括机械压实作用、石英及长石的次生加大、碳酸盐胶结作用,其中压实作用和碳酸盐胶结是造成本区砂岩原生孔隙大量丧失的主要原因。以成岩作用为基础,建立了镇北地区长4+5油层组5种成岩相类型。储层的发育受沉积相、成岩作用和成岩相的影响。有利储层发育的沉积微相砂体类型为三角洲平原分流河道和三角洲前缘水下分流河道砂体,有利的成岩作用和成岩相为长石溶孔相、高岭石弱溶蚀相和绿泥石环边残余孔相。
The petrological characteristics, diagenesis, reservoir types and main controlling factors of reservoir sandbody in Chang 4 + 5 reservoir, Zhenbei area, Zhenbei area, Ordos Basin, are analyzed by observing the rock and the thin castings and conventional physical property analysis. The results show that the pores of reservoir sand bodies in Chang 4 + 5 reservoir are dominated by intergranular pores and feldspar dissolved pores, followed by intergranular dissolved pores. Diagenesis includes constructive diagenesis and destructive diagenesis, constructive Diagenesis includes dissolution, chlorite clay film formation, destructive diagenesis including mechanical compaction, secondary enrichment of quartz and feldspar, carbonate cementation, and compaction and carbonate cementation The main reason for the large loss of primary porosity of sandstone in this area. Based on diagenesis, five diagenetic facies types were established in the Chang 4 + 5 reservoir group in Zhenbei area. Reservoir development is affected by sedimentary facies, diagenesis and diagenetic facies. Sedimentary microfacies sand bodies with favorable reservoirs are delta plain distributary channel and delta front distributary channel sand body. The favorable diagenesis and diagenetic facies are feldspar-dissolved phase, kaolinite weakly dissolved phase and chlorophyll Stone ring residual pore phase.