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基于横波射线弹性阻抗的岩性和流体识别研究(英文).docx

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基于横波射线弹性阻抗的岩性和流体识别研究(英文) Title:RockandFluidIdentificationBasedonShearWaveElasticImpedance Abstract: Intheexplorationanddevelopmentofoilandgasresources,rockandfluididentificationisacrucialstepinreservoirevaluation.Inthisstudy,weproposeamethodforidentifyingrockandfluidbasedonshearwaveelasticimpedance.Themethodisbasedontheconceptofelasticimpedance,whichisaproductofacousticimpedanceandP-wavevelocityorshearwavevelocity.Theoreticalanalysisindicatesthattheelasticimpedanceofrockswithsimilarlithologyanddifferentfluidsaturationvariessignificantlywithvaryingfluidsaturation,andtheeffectoffluidsaturationonshearwavevelocityisgreaterthanthatonP-wavevelocity.Bycalculatingandanalyzingtheshearwaveelasticimpedanceofrocksampleswithdifferentfluidsaturations,wecanestablishacriterionforidentifyingrockandfluidsaturationinareservoir. Introduction: Rockandfluididentificationisanessentialprocessinreservoircharacterization,asitdeterminesthereservoir’sfluidcontentandhelpsinhydrocarbonexplorationandexploitation.Traditionally,rockandfluididentificationisachievedthroughseismicanalysis,welllogging,andcoreanalysismethods.However,thesemethodscanbechallenging,expensive,andtime-consuming.Therefore,researchersarecontinuallyseekingnewmethodstoidentifyrocksandfluidsaccuratelyinatimeandcost-efficientmanner. Shearwaveelasticimpedanceisaneffectiveparameterinrockandfluididentificationasitisrelativelyinsensitivetoporosityandmoresensitivetofluidsaturationthanotherseismicparameters.ElasticimpedanceiscalculatedusingtheproductofacousticimpedanceandP-waveorS-wavevelocity.Acousticimpedanceistheproductofdensityandseismicwaves’velocity,whereasP-waveandS-wavevelocityrepresentthespeedatwhichthesewavestravelthroughtherocksample. Methodology: Inthisstudy,weperformedlaboratorymeasurementexperimentstoevaluatetheshearwaveelasticimpedanceofrocksamplesatdifferentfluidsaturations.WeusedultrasonicwavemeasurementstoobtaintheP-waveandS-wavevelocitiesoftherocksamples.Thefluidsaturationofeachsamplewaschangedbyinjectingdifferentfluid