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ID:39255652
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页数:18页
时间:2019-06-28
《Anisotropic parameters and P-wave velocity for orthorhombic media英文学习材料》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、GEOPHYSICS,VOL.62,NO.4(JULY-AUGUST1997);P.1292–1309,6FIGS.AnisotropicparametersandP-wavevelocityfororthorhombicmediaIlyaTsvankin¤ABSTRACTprocessinginthesymmetryplanesoforthorhombicme-Althoughorthorhombic(ororthotropic)symmetryisdia.Thenewnotationhasprovedusefulindescribingbelievedtobecommonforfractu
2、redreservoirs,thedif-seismicsignaturesoutsidethesymmetryplanesaswell,ficultiesindealingwithnineindependentelasticcon-especiallyforP-waves.LinearizationofP-wavephasestantshaveprecludedthismodelfrombeingusedinseis-velocityintheanisotropiccoefficientsleadstoaconcisemology.Anotationintroducedinthisworkisd
3、esignedweak-anisotropyapproximationthatprovidesgoodac-tohelpmakeseismicinversionandprocessingforor-curacyevenformodelswithpronouncedpolarandaz-thorhombicmediamorepracticalbysimplifyingthede-imuthalvelocityvariations.Thisapproximationcanbescriptionofawiderangeofseismicsignatures.Takingusedefficientlyt
4、obuildanalyticsolutionsforvariousadvantageofthefactthattheChristoffelequationhasseismicsignatures.thesameforminthesymmetryplanesoforthorhombicOneofthemostimportantadvantagesofthenewno-andtransverselyisotropic(TI)media,wecanreplacetationisthereductioninthenumberofparametersre-thestiffnesscoefficientsb
5、ytwovertical(PandS)veloc-sponsibleforP-wavevelocitiesandtraveltimes.Allkine-itiesandsevendimensionlessparametersthatrepresentmaticsignaturesofP-wavesinorthorhombicmediade-anextensionofThomsen’sanisotropycoefficientstoor-pendonjusttheverticalvelocityVP0andfiveanisotropicthorhombicmodels.Bydesign,thisno
6、tationprovidesaparameters,withVP0servingasascalingcoefficientinuniformdescriptionofanisotropicmediawithbothor-homogeneousmedia.Thisconclusion,whichholdseventhorhombicandTIsymmetry.fororthorhombicmodelswithstrongvelocityanisotropy,Thedimensionlessanisotropicparametersintroducedprovidesananalyticbasisf
7、orapplicationofP-wavetrav-herepreserveallattractivefeaturesofThomsennota-eltimeinversionanddataprocessingalgorithmsinor-tionintreatingwavepropagationandperforming2-Dthorhombicmedia.mediathatcontainsma
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