At present, the understanding of turbidite fan sedimentary system on reservoir physical property of upper Es3 member in Western Chezhen sub⁃sag is scarce, especially the indirect influence of different sedimentary microfacies on reservoir physical properties by controlling diagenesis lacks systematic and regular knowledge. Based on the study of the overall sedimentary characteristics and the data of reservoir physical properties, casting thin section identification, X⁃ray diffraction analysis and core routine analysis, this paper studies the influence of three main sedimentary microfacies types on reservoir physical properties of turbidite fan system in Chexi depression. The results show that study area developes 4 kinds of diagenesis including compact and pressure solution, cementation, dissolution, metasomatism. There are 3 kinds of sedimentary micro⁃facies including braided channel, interchannel, and slump turbidite fan. Besides, there is not only direct effect micro⁃facies on diagenesis, but also indirect effect though dominate the distribution of diagenesis. By comprehensive consideration, three favorable oil⁃bearing blocks have been selected.