Abstract: Chang 7 reservoir in Luohe oilfield is a delta front facies deposit,which mainly develops the delta distributary channel and mouth bar.The controlling effect of sedimentary microfacies on sand body distribution,reservoir physical properties,oil-bearing feature and heterogeneity was analyzed.The research results indicate the underwater distributary channel is a favorable sedimentary microfacies,with characteristics of big thickness,good physical properties and good oil-bearing feature,which is mainly of oil spots and oil immersion.The favorable well log facies are jugged box shape,box shape and bell shape.The internal heterogeneity of the sedimentary microfacies is evaluated from the aspects of permeability rhythm and heterogeneous quantitative parameters,and the heterogeneity of the distributary channel is stronger than that of the mouth bar.