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通过薄片观察、阴极发光、扫描电镜、同位素地球化学等分析化验资料的研究,对四川盆地东北部达州—宣汉地区鸡唱剖面飞仙关组碳酸盐岩储层的岩石特征、成岩作用和成岩演化序列进行系统描述,认为该区飞仙关组飞二段鲕粒滩储层沉积相—成岩相演化与飞二段经历的2次海平面下降有关。储层的孔隙演化亦与这2次海退过程有关,孔隙大小由准沉积期的海水环境下的胶结成岩作用和混合水环境下的白云石化作用所决定。
Through the observation of thin-film observation, cathodoluminescence, scanning electron microscopy and isotope geochemical analysis, the rock characteristics, diagenesis and lithology of Feixianguan Formation carbonate reservoir in Dazhou-Xuanhan area, northeastern Sichuan Basin, Diagenetic evolution sequence, the authors believe that the sedimentary facies-diagenetic facies evolution of the oolitic beach reservoir in the Feixianguan Formation of the Feixianguan Formation is related to the second sea-level decrease experienced by the second member of the Feixianguan Formation. The pore evolution of the reservoir is also related to these two subsidence processes. The pore size is determined by the cementation-diagenesis in the quasi-sedimentary marine environment and dolomitization in the mixed-water environment.