Study On Distribution And Communication Of Monosandbody In Fuyu Oil Layer Of Xinmin Oilfield

Since many years of water-flood,Xinmin's oil field has gone into period of high water cut exploitation.The heterogeneity of reservoir becomes more serious, the distribution of water and oil becomes more complex.Sand members, sub-zones and deposit cell considerd as research elements of reservoir no longer meet the current production need of Xinmin oil field. So vertical partion, plane distribution and communication of monosandbody in reservoir becomes the priority of research.Xinmin's fuyu oil layer was considered as the intended interval,based on core analysis and dense well logging, in combination with sequence stratigraphic analysis of reservoir,four types contact models of monosandbody (isolated type,interface type,cut-folded type,overlay type)were put forward by using comparison technique of deposit cell's datuming top and feature of log response.In vertical direction, two types surface of intercalation were identified:muddy intercalation and calcareous intercalation,on plane,in view of time cells in which composite channels'sand body well developed, by utilizing summarized contact models,combinational channels' sand body was divided into monosandbody,the boundary of which was located,its characteristic of wideness and thickness was described.Intrastratal heterogeneity of monosandbody was analyzed by rhythmicity of size,heterogeneous degree and distribution of intercalation.Interlayer heterogeneity of monosandbody was analyzed by feature of insulation,the heterogeneity of Xinmin's fuyu oil layer was serious as a whole.Research showed that sand body of wide and thick composite channels developed by cutting and folding of sand body in delta-plain distributary channels built the main reservoir.The bound of monosandbody in large size composite channel is the concentration region of remaining oil.Communication of monosandbody was verifyied by using interwell tracer test.Taking m32-34 well group for example,the result of trace monitoring manifested that m+32-036 well and m+30-34 well which were not in the same monosandbody with the m32-34 tracer injector well could not breakthrough obviously,so the communication between the two monosandbodies were bad.The study that communication of monosandbody had an effect on distribution of remaining oil was confirmed by analyzing production performance data of the well group,then the well group's remaining oil was anticipated,and the resolvent was proposed.