Sedimentary Microfacies and Sandstone Distribution Pattern in Delta Deposit of Slope Belts:A Case from Chang-6_1 Oil Reservoir of Yan chang Formation in Suijing Area

Chang-61 oil reservoir of Yanchang Formation is the main target layer in Suijing Area in Shanbei.It is a great significance for speeding up oil exploration and development to study microfacies and sandstone distribution of Chang-61 reservoir of Yanchang Formation.Sedimentary facies and logging facies are studied by core data, well logging, production and laboratory test.The microfacies of Chang-61 reservior include distributary channel, interdistributary embayment, subaqueous distributary channel and subaqueous interdistributary embayment and so on; there are multi-channels in Suijing Area, and the main distribution direction is northeast-southwest.The thickness of banded channel sandstone is 8～20m, and the distribution direction is the same as that of the channels.The physical property of the channel sandstone is better, and the channel is the key area for further exploration.