The Study On Reservoir Architecture Of Well Logging And Seismic Data Combination Of Pu ? Formation In Xing 6 Area Of Daqing Oilfield

Xingshugang Oilfield is one of the main oilfields in Daqing Oilfield.Due to its long-term development,the main oil layers of the Xingshugang Oilfield have already entered the late stage of high water cut.In addition,because of the extremely high well pattern density,strong reservoir heterogeneity and challenging polymer injection process,the architecture characteristics of subsurface reservoir is still poorly understood.As a result,a large number of remaining oil still remains underground,which makes it difficult to improve the oil recovery.Therefore,in view of the geological conditions and development status of the study area,the fine reservoir architecture research was carried out,and the distribution characteristics of sand body architecture and the control effect of reservoir architecture on remaining oil were clarified,which will provides a reliable geological basis for the adjustment of later development plan and the enhancement of oil recovery in the study area.According to the reservoir geological characteristics of the fluvial delta in the Putaohua reservoir of Xingshugang Oilfield,the integrated core,well logging and seismic data was used,and the research idea of "combination of well logging and seismic data,model guidance,interaction of plane and section,and hierarchical analysis" was adopted in this study.Then,the fine isochronous stratigraphic framework was established for the subsurface reservoir in the west of Xing 6 area,Xingshugang Oilfield.Based on the application of logging interpretation,combined with frequency division multi-attribute fusion technology and frequency division multi-attribute inversion technology,the prediction of reservoir distribution was carried out,and the types and characteristics of architecture elements in the study area were determined.Finally,the logging and seismic response patterns of the boundary of channel sand body were summarized,and the hierarchical architecture characterization of the reservoir in this study area was completed.The results show that:(1)The fine isochronous stratigraphic framework based on a single layer was established in the study area.The stratum in the study area is generally in the form of aggradation stratigraphic structure,and the stratum thickness gradually increases from north to south along the paleocurrent direction,which conforms to the shallow water delta stratum development mode;(2)The reservoir scale of the study area is decreasing from the bottom to the top.The sand body of PI3 sandstone formation is the most developed,with large thickness and continuity,and there are mainly two plane distribution patterns of "contiguous sheet" and "wide strip".The main small layer is dominated by point bar and abandoned channel.As the boundary of point bar,the abandoned channel is developed continuously.Accordingly,point bar is distributed in the form of beads on both sides of the abandoned channel,and there are mudstone and a small amount of over bank deposits in the distributary bay around the channel;(3)The frequency division multi-attribute fusion method obviously improves the correlation between seismic attributes and sand body thickness,and makes reservoir prediction more accurate.In addition,frequency division seismic inversion method can effectively predict the distribution of sand bodies between wells;(4)The research method of reservoir distribution prediction and reservoir architecture characterization based on the research idea of "combination of well logging and seismic data,model guidance,interaction of plane and section,and hierarchical analysis",which integrates the advantages of seismic data and logging data,increases the predictability of thin sand body and the prediction accuracy of complex sand body,and is especially suitable for oil fields with such geological characteristics as dense well pattern,small well spacing and thin formation.This study not only provides a geological reference for the exploration of remaining oil and the adjustment of subsequent development plan in the western part of Xing 6 area,but also has important reference significance for the architecture analysis of the oilfield with similar geological characteristics and data basis.