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测井资料在英安井田煤层对比中的应用.docx

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测井资料在英安井田煤层对比中的应用 Introduction Coalbedmethane(CBM)isanimportantsourceofenergythatneedstobeevaluatedforproperusage.TheevaluationofCBMreservesusingwellloggingtechniqueshasbecomeincreasinglyessentialovertheyears.Welllogsprovidesignificantinformationaboutlithology,porosity,andpermeabilityofrockformationsinthesubsurface.Thisinformationisusedindeterminingreservoirvolumetrics,thepotentialofCBMreserves,andtheidentificationofsuitablezonesfordrillingandcompletion. Applicationofwelllogsincoalbedmethaneexploration Welllogsprovideessentialgeologicalandpetrophysicalinformationonlithology,fluidcontent,porosity,andpermeabilityofthecoalseam.TheuseofwelllogsinCBMexplorationinvolvesananalysisofboththephysicalandchemicalpropertiesofthecoal.ThemostcommontypesofwelllogsusedinCBMexplorationaretheGammaRay(GR)andElectricLog(EL). GammaRaylogsareusedtodeterminethenaturalradioactivityofrockformations.ThereadingsfromGammaRaylogshelptoidentifythesandstones,shales,andcoalseamspresentinthesubsurface.GammaRaymeasurementscanalsoassistintheidentificationofmineraldepositionalenvironments,whichinfluencecoalseamqualityandthicknessinthesubsurface.TheGRlogsalsohelptodifferentiatebetweencoalandshaleduetotheirdifferentradioactiveproperties. TheElectricLogisanotherwidelyusedloginCBMexploration,anditmeasuresresistivityvariationinrockformations.Incoalseamexploration,theElectricLoghelpsintheidentificationofcoalseamcontinuityandthickness.Theresistivityofcoalhasahighervaluethanthatofthesurroundingrockformations,andthispropertyhelpstodifferentiatebetweencoalandrockformations.Theresistivityofcoalunderdifferentconditions,suchaswatersaturation,gassaturation,andtemperature,canbedeterminedusingtheElectricalLog.ThisinformationiscrucialforthedesignofCBMwellborecompletionandoptimization. ThePorositylogisusedinidentifyingthepotentialreservoirzoneswithincoalseams.Porosityisacrucialparameterforestimatingreservoirvolumetrics,GasinPlace(GIP),andflowpathways.Theporosityofthecoalseamresultsfromthelossofthevolatilecomponentsprese