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鄂尔多斯盆地中南部延长组8油层组主要成岩作用包括压实作用、石英次生加大、自生绿泥石膜生长、次生高岭石化、连晶方解石交代、长石溶蚀。根据铸体薄片,碳氧同位素分析,确定了各种主要成岩产物的空间分布和成因,分析了成岩产物分布与现今总面孔率的关系,从而确定8油层组的物性主要受石英次生加大、连晶方解石、长石溶孔、剩余原生孔隙分布的控制。石英次生加大和连晶方解石发育的地方,储层物性差;具自生绿泥石膜的剩余原生孔隙和长石溶孔发育的地方,储层物性好。
The main diagenesis of Yanchang Formation reservoir 8 in central-southern Ordos Basin includes compaction, quartz secondary growth, authigenic chlorite film growth, secondary kaolinite formation, cristobalite metathesis and feldspar dissolution. According to the analysis of the carbonaceous and oxygen isotopes, the spatial distribution and genesis of various diagenetic products were determined. The relationship between the distribution of diagenetic products and the present total porosity was analyzed. , Even with calcite, feldspar dissolved pores, the remaining primary pore distribution control. Quartz secondary growth and calcite even with the development of places, poor reservoir properties; with self-chlorite membrane residual primary pores and feldspar dissolved pores where the reservoir properties are good.