Relationship between sedimentary facies and remaining oil distribution of Karamay Formation in eastern block 1 of Karamay Oilfield

Karamay Formation in eastern block 1 of Karamay Oilfield is rich in remaining oil, but the distribution of remaining oil is very complicated, with the characteristics of highly dispersed and local enrichment. Sedimentary facies is one of the main factors controlling the reservoir development, so the fine description of sedimentary facies can provide help for studying the regulation of the remaining oil distribution. Based on core and well logging data, the characteristics of petrology, sedimentary structure and electroficies were studied. Trough the analysis of facies association, facies matching and well logging response, the sedimentary facies types of Karamay Formation in eastern block 1 were identified, including alluvial fan, braided river, fan delta and lake facies. The plane distribution and vertical evolution of sedimentary facies were discussed. It is considered that Karamay Formation mainly experienced twice of lake transgression, and can be vertically divided into three up fine normal cycle. The remaining oil distribution in the microfacies that have poor properties was discussed, which has important guiding significance for the further development of the oilfield.