Abstract:The sandy-conglomerate reservoir of upper Wuerhe formation in the M1 well block of Mahu Sag shows strong heterogeneity with pore structure and oil testing productivity. The sedimentary facies, diagenetic facies, fracture facies and reservoir comprehensive classification of upper Urho formation in M1 well block are studied by using core, thin section, logging and oil testing data. The results show that there are mainly two types of fan delta glutenite reservoir: gravity flow and traction flow, which correspond to three sedimentary microfacies such as fan channel, underwater distributary channel and debris flows. Four diagenetic facies, such as weakly-compacted facies and corrosion facies can be identified. Sedimentary facies and diagenetic facies are the main reservoir influence factors. According to this, the reservoir can be divided into 6 kinds of petrophysical facies. On the basis of sedimentary facies and diagenesis relative to the reservoir, the influence of the 6 types of petrophysical facies summarized as three types of reservoir, among which the reservoirs of type I and II are the best, the reservoirs of type III are the worst. Good matching of rock physical phase and oil test results in this area can effectively predict favorable reservoir distribution area.