Sedimentary Facies of the Chang 2 Member of Yanchang Formation in Area A of Northern Shaanxi

In order to promote the rolling exploration and development of oil reservoirs in northern Shaanxi, a fine study sedimentary facies area A has been carried out. Using core logging data, on basis identifying different levels sequence interfaces lake flooding, Chang 2 Member Area was divided into two base level cycles, high-resolution stratigraphic correlation established. On description, analysis single-well facies, continuous-well planar are It is believed that member delta plain deposit, dominated by distributary channels, inter-distributary depressions, natural dike microfacies. There three main rivers area. Both vertical plane show length sand bodies more developed than 1 bodies. Among small layers , body relatively well developed, channel width thickness large, making it most favorable reservoir.