The Study Of Sedimentary Microfacies And Reservoir Heterogeneity Of Putaohua Oil Layer In Weixing Area Of Daqing Oil Field

The Weixing area is located in the East-Wing slope of Taiping Tuen anticline structure in the placanticline of Daqing of Songliao Basin,and its Putaohua oil layer is one of the most important producing layers in the periphery of Daqing oilfield.But its reservoir thickness is relatively thin,and the reservoir heterogeneity is strong.With the later development,the output of the Weixing area is gradually reduced,the water content is increasing and the distribution of oil and water is more complicated.It is important to further study the distribution of the remaining oil and the measures to dig the potential of the remaining oil.On the basis of summing up the achievements of previous studies,using the core data,logging data and seismic data of the Weixing area,using the principles of sedimentology and stratigraphic sequence,the target layer is controlled by the standard layer,and then the Putaohua oil layer in the Weixing area is compared with the sequence of the reservoir group-single layer-timebox with from the large to the small.The stratigraphic framework is established by comparing the sequence well and well in different levels.On the basis of it,the sedimentary microfacies study in this area is carried out by identifying the corresponding relationship of the rock and well log,and established the well logging models to fine characterization of sedimentary microfacies of Putaohua oil layer in Weixing area.Use the data of porosity and permeability date and sandstone data and interbed date of the area to study the macro reservoir heterogeneity from three aspects: the inner layer aspect and the interlayer aspect and the plane aspect.Finally,on the basis of the study of the macro heterogeneity of the reservoir,the distribution of the remaining oil in the Weixing area of the Putaohua oil layer is analyzed and predicted by the method of heterogeneous composite index.Thus,the problems such as the stratification chaos in the Weixing area,the inaccurate identification of the sedimentary microfacies,the inconsistency of the heterogeneity of the reservoir and the determination of the distribution of the remaining oil are difficult to be determined,so as to provide the basis for the goal of achieving the stable production of Daqing oil field.