Researches On Fine Reservoir Description And Optimized Well Deployment In Block Huan26Dujiatai Formation

After30years of exploration and exploitation， Huan Dong~Shuang oilfield haveentered a high water-cut and high recovery stage which called "double high" stage， and itbecome more difficult to stabilize the production. As an important part of method to make upproduction decline， Capacity building is also facing many difficulties such as difficulties offurther adjustment in old areas， new reserves shortage， complex built block geologicalconditions， and the situation is grim. Huanbei Dujiatai reservoir is a low permeabilityreservoir whit an oil bearing area of37.2Km2， geological reserve of2409×104t， recoveryrate of only0.32%，recovery of19.2%，which is the main building block of next step. Thisblock is a complex reservoir whit a low reservoir understanding degree and is difficult todeploy wells， which was cut by multi phase faults， therefore， to carry out the experimentresearch is essential， which can provide certain reference for the next step of blockdeployment. Huan26block is a typical level four block of Dujiatai reservoir in Huan12block，with a oil bearing area of3.8Km2，geological reserve of296×104t which reported in1987and Reservoir burying depth of2435m-2820m. This block was developed in1980，after30years of exploitation， the development effect has become worse and worse.the oilrecovery rate of the block is0.34%and the recovery14.5%before we research it. In order toimprove the development effect of the block and improve the ultimate recovery， we mustcarry on fine analysis and tap the potential of reservoir further. We have carried out researcheson fine description of geologic body by means of “combination of well and seismic”，implemented accurate faults location and micro structure of small layer， Drawn thesedimentary microfacies distribution map， recalculated block geological reserve， analysedrelationships of capacity and seismic amplitude attributes， built Capacity prediction plates，analysed properties of water rejection stage， reservoir change regulations and residual oildistribution regulation of Huan26Dujiatai reservoir in natural energy development stage byUsing well production data and oil saturation of new wells， high pressure properties， coreexperiment data， through statistical method， drawing method and numerical simulationmethod on the basis of researches on reservoir geologic properties. Through comprehensiveresearch we realized that the geological body of southern extension area in Huan26Dujiataireservoir was highly implemented， which has a high predictable productivity and enrichremaining oil， and is feasible of well deployment. On the basis of the above researches， weoptimized designment of extending deployment in block Huan26Dujiatai reservoir anddeployed a total of21wells which greatly improved the development effect of the block.