Study On Remaining Oil Distribution Of Pu ? Formation In The Middle Block Of Xing 1~2 East In Daqing Oilfield

The middle part of the Xing 1~2 east is located in the northeastern part of Xingbei Development Zone,which was put into development in 1966.At present,it has the characteristics of high recovery level and comprehensive high water content.As a result of the block of a class of oil tertiary oil recovery,the overall level of recovery is high,water drive development effect is deteriorating.Therefore,in view of the present situation of exploration and development in the study area,the remaining oil distribution law of the study area is studied,and the geology basis of oil and gas development work is provided for the subsequent study of the potential of the adjustment and adjustment of the area and the improvement of the water development effect.Based on the core observation data,the analysis and test data and other data collected from the study area,this paper carry out fine stratigraphic division work to each layer in Group Pu II oil layer on the principle of "cycle comparison,grading control and difference treatment for different sedimentary facies".The sedimentary system,subphase and microfacies types of the Pu II Formation are determined by the regional investigation and the combined data and the sedimentary background.The logging mode is established,and the microfacies of each layer are identified and predicted.The micrographs of the sedimentary microfacies are drawn,and then the drilling rate characteristics of each layer are studied.The characteristics of reservoir physical property and effective thickness of sand body are analyzed,and the reservoir heterogeneity is analyzed from three aspects: layer,interlayer and plane.The geometric modeling grid accuracy is established,and the model of the study area,the sedimentary microfacies model and the reservoir attribute are established,and the model is coarsened.Further numerical simulation,to complete the historical fit.Based on the numerical simulation results of reservoirs,the distribution law of remaining oil is analyzed from the aspects of plane and vertical.Combined with the geological characteristics of sedimentary microfacies and reservoir heterogeneity,the control factors of remaining oil distribution were analyzed.The results show that the remaining oil reserves are mainly distributed nearby X1-D3-338,X1-30-P50,X1-40-P48,X2-1-434 and other wells on flat surface.On the other hand,the remaining recoverable reserves in the vertical are mainly concentrated in the PII82,PII11,PII12 and other layers.The remaining oil distribution is mainly controlled by the geological factors such as reservoir heterogeneity,sedimentary microfacies,fault and sandstone thickness and so on.