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Kumkol-North油田高含水期油藏精细描述.docx

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Kumkol-North油田高含水期油藏精细描述 1.Introduction Inrecentyears,Kumkol-Northoilfieldhasbeeninahighwater-cutperiod,andthefinedescriptionofoilreservoirsinthisperiodhasbecomeafocusofresearch.Thestudyofthefinedescriptionofhighwater-cutperiodoilreservoirscanprovideabasisforunderstandingthecharacteristicsanddistributionpatternsofresidualoil,andcanalsoprovideguidanceforthedesignandimplementationofoilrecoverymeasures.Thispaperwillfocusonthefinedescriptionofhighwater-cutperiodoilreservoirsinKumkol-Northoilfield.First,wewillintroducethegeologicalcharacteristicsoftheoilfield.Then,wewillanalyzethecharacteristicsofthereservoirinthehighwater-cutperiod,andconductadetaileddescriptionoftheresidualoildistributioninthereservoir. 2.GeologicalCharacteristicsofKumkol-NorthOilfield Kumkol-NorthoilfieldislocatedinthecentralregionofKazakhstan,withanareaofapproximately2600squarekilometers.TheoilfieldiscomposedofasequenceofCenozoicsedimentaryrocks.ThemainoillayeristheLowerCretaceousformation,whichischaracterizedbythinandinterbeddedsandstoneandmudstonelayers.Thethicknessoftheoil-bearingformationisgenerallybetween30and70meters.Theoilreservoirsaregenerallyburiedatdepthsof1500to2500meters,withthereservoirtemperaturebeingbetween80and100°C. TheoilinKumkol-Northoilfieldismainlyofparaffin-type,withlowsulfurcontentandhighviscosity.Theoilviscosityrangesfrom200to2000mPa·s,whichisthemainfactoraffectingtheoilrecoveryrate.Theoilreservoirsintheoilfieldaremainlycharacterizedbyhighporosity,lowpermeabilityandhighheterogeneity. 3.ReservoirCharacteristicsintheHighWater-CutPeriod Thehighwater-cutperiodisacriticalperiodforoilfielddevelopment,duringwhichthereservoircharacteristicschangesignificantly,leadingtochangesinproductionandoilrecoveryefficiency.Thehighwater-cutperiodofKumkol-Northoilfieldgenerallyreferstoaperiodwhenthewater-cutexceeds70%.Duringthisperiod,thereservoirpressurewilldecreaserapidlyduetotheincreaseofwatercontent,theoildisplacementefficiencywilldecrease,andtheoilrecoveryratewilldecreasesignificantly. Duringt