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脉冲中子全谱测井碳氧比资料在南堡钙质砂岩储层的应用.docx

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脉冲中子全谱测井碳氧比资料在南堡钙质砂岩储层的应用 Abstract： Inthestudyofthereservoir,itisessentialtodeterminethecontentofcarbonandoxygen.Thispaperdiscussestheapplicationofpulsedneutronfullspectrumloggingcarbon-oxygenratiodatainthecalciumsandstonereservoirofNanpu. Introduction： Pulsedneutronfullspectrumloggingtechnologyiswidelyusedintheoilandgasexplorationandproductionindustry.Itcanprovidevariousinformationoftheformation,suchasporosity,lithology,formationfluidtype,andsaturation.Amongthem,carbon-oxygenloggingdatacanreflectthecarbonandoxygencontentintheformation.TheapplicationofthistechnologywasstudiedinthecalciumsandstonereservoirofNanpu. GeologicalBackground： NanpuoilfieldislocatedinthenortheastBohaiBayBasin,withanaveragewaterdepthof20-25meters.Thereservoirsaredividedintothreelevelsfromtoptobottom:argillaceoussiltstone,calciumsandstone,andgypsiferoussiltstone.Thecalciumsandstonelayeristhemainreservoir,withhighporosityandpermeability,andgoodphysicalpropertiesoftheformation.Thecarbonatecontentintheformationisanessentialfactoraffectingthereservoirproperties,especiallytheporestructure,porosity,andpermeabilityoftheformation.Therefore,thecontentofcarbonandoxygenintheformationisofgreatsignificancefortheevaluationanddevelopmentofthereservoir. LoggingDataInterpretation： Accordingtothecharacteristicsoftheformation,theloggingdataareinterpretedbyusingthemulti-parametersimultaneousinversionmethod.Theresistivity,neutron,density,andgammaraylogsarecalibratedandtheformationparameterssuchasporosity,watersaturation,permeability,andlithologyarecalculated.Thecarbonandoxygencontentintheformationiscalculatedbyusingthecarbon-oxygenloggingdata. Thecarbon-oxygenloggingdataisobtainedfromtheneutronspectrumofpulsedneutronlogging.Thecarbonandoxygenelementshavedifferentresponsestotheneutron,andbyanalyzingthespectralchangesoftheneutronresponse,thecontentratioofcarbonandoxygencanbeobtained.Thecalculationformulaisasfollows: CO_ratio=(C_n/(O_n+C_n))*100% (C_nrepresentsthecarboncounts,O_nrepresentstheoxygencounts) Calculation