Diagenesis facies of Permian sandy conglomerate reservoir in footwall of Kebai Fault in northwestern margin of Junggar Basin

According to core observation, thin section analysis, scanning electron microscope, mud logging and well loggingdata, the rock type and the diagenesis ofPermian sandyconglomerate 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 cementation- middle dissolution facies, high mature-weak compaction facies, high mature-strong compaction facies, lowmature-weak compaction facies and lowmature-strongcompaction facies. Then, the formingconditions, the features, the environment, evolutionary sequence and model of each diagenesis facies are summarized. The reservoir properties of sandy conglomerate ofdifferent diagenesis facies are analyzed, and it is suggested that the high mature-strong dissolution facies has the most favorable reservoir properties.