Abstract: This essay use the contact relation between the amplitude, shape, or, smooth degree of conventional log natural gamma ray, natural potential, deep lateral resistivity curve to analysis The sedimentary facies in the study area . According to the characteristics of different logging facies, 3 sedimentary facies and 26 sedimentary microfacies are identified. Including the micro facies of the heart, braided channel, the micro channel of the channel, the sand of the overflow, the microfacies of the sand table. On the basis of the identification of well logging facies, the micro phase diagram of the representative layer is precisely plotted.