摘要
The authors analyze the sedimentary facies in the oil group of Ⅳ, Ⅴand Ⅵ of H3 Member in the Gucheng oil filed. Based on the analysis of the whole Biyang Depression, they describe the drilling core from many aspects. Combined the well logging facies analysis, with the analysis of single well microfacies and sections of united wells, the authors consider that the region of interest belongs to be sub-facies deposition of the front fan delta. They subdivide the precipitation facies into the microfacies of underwater distributary channel, river mouth bar, sheet sand and interdistributary bays. And then, the authors establish the depositional model of the region of interest.