Research on sedimentary facies of the Upper Karamay Formation in middle block 1 of Karamay Oilfield

Based on core observation,logging and production performance data,sedimentary facies of the Upper Karamay Formation in middle block 1of Karamay Oilfield are studied by analyzing the rock association,sedimentary structure,logging facies and sand body shape.The results show that braided river delta plain subfacies and braided river delta front subfacies are developed in the Upper Karamay Formation of middle block 1.Among them,braided river delta front subfacies are developed in S52-2,which include underwater distributary channel,mouth bar,sheet sand and delta front mud.Braided river delta plain subfacies are developed in S52-1 to S51-1,S4and S1,which mainly develop distributary channel,overbank sand and interdistributary bay.