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利用基于子波估计的频谱校正方法提高Q值估计精度(英文).docx

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利用基于子波估计的频谱校正方法提高Q值估计精度(英文) Abstract Seismicattenuation,measuredbythequalityfactorQ,isanimportantparameterforseismicexploration,anditsaccurateestimationiscrucialforreservoircharacterization.Inthisstudy,weintroduceawavelet-basedspectralcorrectionmethodtoenhancetheaccuracyofQestimation.Thismethodestimatesthefrequency-dependentQvaluesbycalculatingtheattenuationcoefficientdirectlyfromseismicdata,andthencorrectsfortheeffectsofrecordinginstrumentandpropagationmediumontheseismicspectrum.NumericalexperimentsdemonstratethattheproposedmethodcanprovidemoreaccurateandrobustestimationsofQvaluesthantraditionalgeometricandlogarithmicfits.Ourresultssuggestthatthewavelet-basedspectralcorrectionmethodhasthepotentialtoimprovethereliabilityofQestimationforseismicexplorationandreservoircharacterization. Introduction Inseismicexploration,thequalityfactorQisafundamentalparameterthatcharacterizestheattenuationofseismicwavespropagatingthroughsubsurfacegeologicalstructures.ThesmallQvalueindicatesstrongattenuation,andthelargevaluesuggestsweakattenuation.TheaccurateestimationofQvaluescanprovidevaluableinformationaboutthesubsurfacegeology,suchasfluidcontent,lithology,andfracturedensity,whichisessentialtoeffectiveoilandgasreservoirexplorationandproduction(Zhangetal.,2016). TherearemanydifferenttechniquesforestimatingQvalues,includingthespectral-ratioandspectral-divisiontechniques,thewavelet-scalogrammethod,thespectraldeconvolutionmethod,andtheGaussianbeammethod(AdamsandKjemperud,1993).Amongthem,thespectral-ratiomethodisoneofthemostcommonlyusedmethodsforQestimation,whichreliesontherelationshipbetweentheamplituderatioofthehigh-frequencytothelow-frequencyportionsoftheseismicspectrumandtheQvalue(Duffautetal.,2010).However,thespectral-ratiomethodissubjecttomanylimitations,suchastheinadequatefrequencyresponseoftherecordinginstrument,theinterferenceofthesurfacewavesandmultiples,andthevariationoftheQvaluewithfrequency.TheselimitationscanleadtoinaccurateestimationsoftheQvalue,whichcancompromisethereliabi