Study On Distribution Regularities About The Remaining Oil Of The Upper Karamay Reservoir In Wu2Dong Area Of Karamay Oil Field

The upper karamay reservoir in Wu2 Dong Area of Karamay oil field have a monoclinal structure from northwest to southeast tilt,belonging to glutenite reservoir with medium size porosity and low permeability.The problems existing in the reservoir at present is that the reservoir has no nomal water injection and low oil production.We applied core,well logging,seismic and dynamic data to do oil development effect evaluation and dynamic analysis,and find the main controlling factors leading to the problem that the reservoir has no nomal water injection and low oil production.At the same time,we use three methods of relative permeability curve method,water drive characteristic curve method,and the method of suction fluid producing profile to calculate the residual oil saturation and analysis the law of reservoir remaining oil distribution.Use the method of deterministic 3D geological modeling and numerical simulation to complete the quantitative characterization of the remaining oil distribution of upper karamay reservoir in Wu2 Dong Area,then analysis the remaining oil research of glutenite reservoir respectively from the micro structure of sand body,sand microfacies,reservoir quality,production methods and engineering measures,etc,then research the enrichment regularity and main control factors of remaining oil in combination with dynamic development measures analysises and comprehensive analysis of static geological research,aiming to determine the law of residual oil distribution,adjust the potentialities object of oil and provide the basis for oil field to improve oil recovery.We analysis the reasons of the poor water flooding effect is that formation energy losses,poor connectivity of reservoir and low perforating corresponding.We think the main controlling factors of poor the water injection of water well is that reservoir water sensitivity,poor physical properties,and low the pump pressure,and the main controlling factors of poor oil recovery is that air lock effect caused by large air content and invalid water injection that can't keep the formation energy to make effective water flooding.At the same time,the main control factors of remaining oil distribution are sedimentary microfacies,well spacing density,mining method,strong than average of reservoir thoughting study.Remaining oil distribution at the plane: the side of the river diara source with relatively poor property,and the thin sand layer position of excessive land,Lower position of reservoir in northern with no pattern control,the top position of the micro structure,isolated sand body of fan delta front.Interlayer remaining oildistribution law: the secondary sand mining group of water flooding,and interlayer interference formation of remaining oil.Distribution of remaining oil in the layer: the top of thick oil layer in a sand body cycle,and the edge position of sand body incised stack.