Abstract: Based on the analysis of core and logging, the type and distribution of sedimentary microfacies of Ⅴ、Ⅵ、Ⅶ sand formation of the Sha 2 section in Xia 52 faulted block of Linnan oil field were studied. The results show that the Sha 2 section belongs to delta plain deposit. It is further divided into 4 sub-facieses(delta plain distributary channel, inter-channel area, crevasse splay and crevasse channel). Furthermore, on the basis of above analysis, and through the correlation between wells, the plan distribution of sedimentary microfacies of different sand section were mapped, and the evolvement rule of sedimentary microfacies was revealed. These are benefit for guiding oil exploration. The favorable facies belt is delta plain distributary channel.