伊拉克东南部Mishrif组碳酸盐缓坡特征及储集层类型

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中图分类号：TE122 文献标志码：A

Abstract：The Cretaceous MishrifFormation inthesoutheastern Iraq was deposited inacarbonaterampenvironment，characterized bydiverseandcomplexreservoiroriginsandsignificant developmentcontradictions．Basedondataof11coring wellsacrossfouroilfields inthesoutheastern Iraq，thesedimentarycharacteristicsofthecarbonaterampwereclarified，reservoirtypes were classifiedbyintegratingporegenesis，composition，physical properties，microstructure，andproduction performance，and thecontrolling mechanisms ofthecarbonateramponreservoir development were identified.Theresults showthatthecarbonaterampoftheMishrifFormationismainlyinfluencedbywaveactionwithweak tidalactivity.Facies variationisnotpronounced，componentsarepoorlydiferentiated，reefsaredifculttopreserve，andbioclasticsoalsare widelydeveloped.Allochemsarerarebutbioclastsareabundant.Gravityflowsareabsent，and lithologiesarediversein restrictedenvironments.Reservoirsareclasifiedintofourtypes：vug-dominated，intergranularpore-dominated，isolated pore-dominated，andmicroporous-dominated.Vug-dominatedreservoirsdevelopinpointshoalsandarejointlycontroled bysedimentation，penecontemporaneous diagenesis，andtectonics.Intergranularpore-dominatedreservoirsoccurinbarrier shoalsandtidalchannels，mainlycontrolledbysedimentation.Isolated pore-dominatedreservoirforminlagoonsand front shoal-basinsetings，controlledbydiagenesis.Microporous-dominatedreservoirsdevelopinlow-energysetingssuchaslagoons，slopebottoms，anddeep-watershelves，withlimiteddiageneticalteration.Overall，incarbonateramps，highenergysedimentation promotes thedevelopmentofhigh-qualityreservoirswith strongmicrostructure heterogeneity.Deep-water andrestrictedenvironmentscontroltheformationofbafflesandbarrers.Alargenumberofhigh-porositybutlow-permeabilityreservoirsoccur inopenanddeep-waterenvironments，showingweaklateral heterogeneity，whilerestrictedenvironments host complex reservoir combinations，with strong spatial heterogeneity due to facies changes.

Keywords：thesoutheastern Iraq；MishrifFormation；carbonateramp；reservoirclasification；sedimentary controlreser voir

伊拉克东南部位于美索不达米亚盆地构造前缘带，是世界上重要的油气产区[]。（剩余18252字）