The Study Of Residual Oil Distribution And Potential Of Ao 362-98 Block

Through analyzing the characteristics of the block of geological structure,the conditions for the development of reservoir and fracture development situation,comprehensive analysis of waterflood,by using numerical simulation method,the study of remaining oil distribution features at the block and types,on this basis,according to different residual oil wellblock problems,formulate targeted countermeasures.According to different types of inefficient treatment,improve the block development effect,for later Ao Na low permeability fractured oilfield adjustment to provide a reasonable basis.Precision of the modeling grid 25m×25m×0.25 m.Fitting error of 1.31% in the comprehensive water cut,nissan,nissan oil error 1.91% error 1.37% and cumulative oil production by 1.37%,single well fitting coincidence rate reaches 81.23%.Plane,the remaining oil is mainly distributed in sheet sand body and the subject sheet sand body,accounting for 92.69% of the total surplus reserves;And statistical analysis of different well group of remaining oil,the remaining reserves in under 10 x 104 t well group,accounting for 84.93% of the total remaining reserves,at the same time,has been clear about the 6 remaining oil,enrichment region accounted for 52.89% of the total remaining reserves.Vertically,the remaining oil is mainly distributed in PI11,PI22,PI32 and PI42 sedimentary units,accounting for 69.14% of the total surplus reserves;And statistical analysis of the different level of thickness of residual oil,the main distribution within the level of the effective thickness less than 1 m,accounting for 85.2% of the total surplus reserves.Summed up the six types of remaining oil: retention area,poor reservoirs,imperfect injection-production relation type,fissure water flooded type,fault and sand body side of edge.According to the different types of remaining oil,formulated the corresponding mode of combination of remaining oil and water Wells,and for the overall and the remaining oil enrichment wellblock,analyses the measures to adjust potential,and put forward the current measures can be implemented.