通过岩心观察、薄片分析、扫描电镜分析、测井和录井资料分析，对克－百断裂下盘二叠系砂砾岩储层的岩石类型和成岩作用进行了研究，提出了研究区最主要的成岩作用是压实作用、胶结作用、溶蚀作用。结合成岩作用和成岩阶段的研究，划分出了7 个成岩相：①高成熟强溶蚀相；②高成熟强胶结相；③高成熟中胶结中溶蚀相；④高成熟弱压实相；⑤高成熟强压实相；⑥低成熟弱压实相；⑦低成熟强压实相。并对各个成岩相的形成条件、成岩特征、成岩环境、成岩演化序列和成岩模式进行了归纳和总结，在此基础上，对不同成岩相砂砾岩储层的储集性能进行了总结，认为高成熟强溶蚀相的砂砾岩的储集性能最好。

According to core observation, thin section analysis, scanning electron microscope, mud logging and well logging data, the rock type and the diagenesis of Permian sandy conglomerate reservoir in the footwall ofKebai Fault are studied. The results show that the main diagenesis in the study area are compaction, cementation and dissolution. Combined with the diagenesis stage, the Permian sandy conglomerate reservoir is divided into seven diagenetic facies, they are high mature-strong dissolution facies, high mature-strong cementation facies, high mature-middle cementationmiddle dissolution facies, high mature-weak compaction facies, high mature-strong compaction facies, lowmature-weak compaction facies and lowmature-strong compaction facies. Then, the forming conditions, the features, the environment, evolutionary sequence and model of each diagenesis facies are summarized. The reservoir properties of sandy conglomerate of different diagenesis facies are analyzed, and it is suggested that the high mature-strong dissolution facies has the most favorable reservoir properties.