Research Of Sedimentary Facies And Distribution Of Fine Reservoir Of The Third Middle Submember Of Shahejie Formation In Gaosheng-Leijia Area

The research area locates in Gaosheng oil field, western region of Liaohe Depression. The target formation is the Dalinghe Formation, Third Middle Submember of Shahejie Formation. The complexity of structure, the development of fault, the disorder of sediment development and the messed distribution of reservoir are the major difficulties to conquer in this research, thus the guide for next step of petroleum exploration can be made.The data included drilling, logging and dynamic data analysis. The Third Middle Submember of Shahejie Formation will be divided in to I group and II group. According to the former research, axial gravity sediment is recognized. Axial gravity sediment can be divided into two subfacies: near overflow microfacies and far overflow microfacie. The eastern fault and western uplifting anticline majorly control the axial gravity sediment; the source of gravity sediment comes from eastern steep with more sources. The sediment changes the moving direction along with the long axis of though and then develops the gravity sediment.Reservoir and sediment research focus on the gravity flow shows sandbody vertically is thin and disconnected; horizontally the sandbody mainly developed in the south. The thickest part locates in the Lei 64 with the thickness of 205 m.Totally, the sandbody which is controlled by the deposition and structure mainly developed in the trough.Based on the former study, combined with the data from testing, the comprehensive evaluation of petroleum distribution in the target area has been discussed. The profit petroleum trap has been selected.