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角度域共成像点道集剩余曲率法偏移速度分析(英文).docx

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角度域共成像点道集剩余曲率法偏移速度分析(英文) Angle-domaincommonimagegatherresidualcurvaturemethodforvelocityanalysisduringmigration Abstract: Providingaccuratesubsurfaceimagingisasignificantchallengeingeophysics.Inseismicimaging,findingthecorrectvelocitymodelforimagingiscrucialforobtainingaccurateresults.Severalmethodshavebeendevelopedforvelocityanalysisduringmigration,andoneofthelatestandmostpromisingtechniquesistheangle-domaincommonimagegatheringresidualcurvaturemethod. Thistechniqueisbasedontheanalysisoftheresidualcurvatureofangle-domaincommonimagegathers(ADCIGs)tocalculatemigrationvelocitiesaccurately.Thispaperwilloutlinethefundamentalprinciplesoftheresidualcurvaturemethodanddescribeitsimplementationforvelocityanalysisduringmigration. Introduction: Migrationisafundamentaltechniqueinseismicimagingusedtoproducehigh-resolutionimagesoftheEarth'ssubsurface.However,theaccuracyoftheresultingimagesdependsontheprecisionofthevelocitymodelusedduringtheimagingprocess.Therefore,velocityanalysisishighlycrucialandnecessaryforsuccessfulimaging.Severaltechniqueshavebeendevelopedforvelocityanalysis,includingthesemblancemethod,Dixinversion,andfullwaveforminversion.However,thesetechniqueshavesomelimitationssuchashighcomputationalcosts,limitedaccuracy,andinsufficientresolution. Recently,theangle-domaincommonimagegatheringresidualcurvaturemethodhasemergedasapowerfulandpromisingapproachforvelocityanalysis.Thismethodutilizesthecurvatureofangle-domaincommonimagegathers(ADCIGs)toestimatethecorrectmigrationvelocities.Theresidualcurvaturemethodisnotonlymoreaccuratethantraditionalvelocityanalysistechniquesbutalsooffersothersignificantbenefitssuchaslowcomputationalcosts,improvedresolution,andbetterpenetration. Fundamentalsoftheresidualcurvaturemethod: TheresidualcurvaturemethodisprimarilybasedontheobservationthattheADCIGsarecurvature-constrained,i.e.,theyhavealimitedrangeofcurvaturesforagivenoffsetandangle.Inthismethod,thecurvatureofADCIGsisanalyzedtodeterminethemigrationvelocities.Theresidualcurvaturecorrespon