The Sedimentary Facies of 2~(nd) Member of Fuyu Reservoir of Weixing-Shengping Area in the Northern Songliao Basin

Based on meticulous core observation,description,the markers of sedimentary structure,rock types and characteristics of logging curve response,the depositional facies and its characteristics of the 2nd member(Kf2)of Fuyu Reservoir in the study area were analyzed.On this basis,combined with high-resolution sequence stratigraphic division,the planar distribution characteristics of sedimentary microfacies in the studied area were also studied by taking Grade V sequence stratigraphy framework as unit.The results show that the shallow-water delta sedimentary facies are developed in the area,and the types of sand bodies are mainly of delta plain distributary channel and underwater distributary channel of delta front,vertically the sedimentary water gradually becomes shallow from deep water,it was the shallowest in the period of Q3-SSC5,where the delta front is disappeared,the delta plain is developed in the whole area,the channel sand body is max thickness,it is the optimal period of reservoir sand body development.