Reservoir Description And Remaining Oil Distribution Of Upper S22+3in Pucheng Oilfield

The domestic interdependence coefficient of oil on foreign will ascend60%in2014,but thebackground of stable production is weak after most oilfields entered high-watercut productiontail,in view of severe condition of domestic oil shortage,how to stimulate and stablely yieldefficiently is an important topic of petroleum workmen.Over30years has elapsed since waterflood development of the upper S22+3resevoir inPucheng Oilfield，now it is in high watercut period.On the base of sufficiently utilizing drillingcores，well logging，test analysis，dynamic production and so on,research on reservoir descriptionand distribution law of remaining oil has been carried out in view of questions in development.Research results are as follows:Basal structure framework remains stationary,7minor faultshave been newly found.The lithosomic body of the upper S22+3resevoir in Pucheng Oilfield isdelta-plain deposit, sedimentary microfacies can be divided into river course, interchannel,deltafront sheet sand,far grit and lake muddy microfacies.Interpretation of physical property has beenproceeded once more，Interpretation model of porosity and permeability has been established inaccount of mud affect. Quantity recognition criteria of different interbeds has been built upthrough return amplitude of microelectrode，microinverse and combination gamma ray neutronlaterolog on the base of drillcore data and well logging.The distance from matter source andmicrofacies have certain connection with size and thickness of the interbeds. The distance frommatter source determines size and thickness of the interbeds.Interbeds centralize in sand sheetand far grit.Interbeds have the best stability in sand sheet of the four sedimentarymicrofacies.Stable interbeds trace has been proceeded in seven main sublayers,control effect ofstable interbeds on reserve has been calculated.Controlled reserve by stable interbeds accountsfor18.01%of the total geological reserve of he upper S22+3resevoir in Pucheng Oilfield.Conceptual interbeds by reservoir numerical simulation and the effect of different parameters ofinterbeds on development have been carried out.Its effect degree has been ascertained byregular-crossed trial.Quality research has been carried out by dynamic production performanceand reservoir numerical simulation bas been built and quantity research on remaining oil ofconcrete sublayer,different water-cut level&saturation and concrete form to find relativeenriching palce and to look for important tapping zones.In view of relatively prominent controleffect of interbeds on remaining oil,actual reservoir numerical simulation including interbeds basbeen built to do research about effect of different interbeds on palne and vertical oil distributionto pertinencely prepare for tapping measures. Since reservoir description in2012,by sufficiently utilizing research outcome,newknowledge and outcome have been applied in actual development,20well-time of productionwell and16well-time of injection well have been implemented,and oil gain increases by2287t,beneficial result is favorable with input/output ratio of1：1.69.In view of more remaining oil upand down stable interbeds,wells have been taken measures in enriching palce, and futuredevelopment has been forecasted, the recovery can be raised over six percentage points.