Quantitative study on main controlling factors of remaining oil distribution in Chang 6 ultra-low permeability reservoir
According to the drilling,logging,production and development data,the small layers,sand bodies,and oil layers in the area are finely divided and compared,and the oil layers are finely identified.By combining qualitative analysis,quantitative calculation,and static and dynamic analysis,the low amplitude structural development degree,the develop-ment and stability of sedimentary facies,the change degree of reservoir properties,and the average single well original oil saturation of the oil layers are analyzed quantitative analysis and statistics are made on the average single well original geological reserves,average single well remaining oil saturation,average single well recovery,average single well production,variation coefficient and other relevant geological development parameters.The research shows that the difference of the influence of the change of low-amplitude structural combi-nation unit on the recovery degree is 1.12%,the difference rate is 17.1%,the average cu-mulative production difference of single well is 17.3 t,and the difference rate is 0.7%.The influence of the speed of sedimentation change on the recovery degree has a difference of 0.80%,with a difference rate of 13.7%,and the average cumulative production difference of a single well has reached 544.3 t,with a difference rate of 23.3%.The difference of the in-fluence of the change of reservoir property on the recovery degree is 1.83%,the difference rate is 29.5%,and the average cumulative production difference of single well is 670.4 t,the difference rate is 26.3%.The change rate of oil saturation after years of development in the process of development,the change rate of influence difference of structure is 0.48%,the change rate of influence difference of sedimentation is 1.00%,and the change rate of influ-ence difference of reservoir property is 1.46%.To sum up,changes in reservoir properties have obvious control over the distribution of remaining oil,followed by changes in sedimenta-ry development and finally structural changes.
Chang 6 reservoirquantitative study of remaining oilmain control factorsZichang oil region
NETL
NSTL
万方数据
