STRATA原理和操作课件.ppt

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1、STRATA:SeismicInversionWorkshopPERTH,AUSTRALIAMAY1,2007STRATACourseOutlineOverviewofInversionExercise1-TheWedgeModelExercise2-Erskine3D–InitializingModelBuilding1:LogCorrelationExercise3-Erskine3D-LogCorrelationModelBuilding2:LogInterpolationWaveletExt

2、ractionExercise4-Blackfoot-StartingtheProjectModel-basedInversionParametersExercise5-Blackfoot–Model-basedInversionOtherInversionParametersExercise6-Blackfoot–OtherInversionMethodsInversionistheprocessofextracting,fromtheseismicdata,theunderlyinggeolog

3、ywhichgaverisetothatseismic.Traditionally,inversionhasbeenappliedtopost-stackseismicdata,withtheaimofextractingacousticimpedancevolumes.Recently,inversionhasbeenextendedtopre-stackseismicdata,withtheaimofextractingbothacousticandshearimpedancevolumes.T

4、hisallowsforthecalculationofporefluids.Anotherrecentdevelopmentistouseinversionresultstodirectlypredictlithologicparameterssuchasporosityandwatersaturation.GeneralInversionCommentsLastUpdated:February20073Recursive:TraditionalbandlimitedinversionModelB

5、ased:IterativelyupdatesalayeredinitialmodelSparseSpike:ConstrainedtoproducefeweventsColoured:ModernderivativeofRecursiveInversionElasticImpedance:EnhancementforAVOdataLMR:EnhancementforAVOdataSimultaneousInversion:EnhancementforAVOdataTheseinversionmet

6、hodsareavailableinSTRATA:TypesofInversionLastUpdated:February20074ImpedanceAcousticShearElasticReflectivityWaveletSeismicThecommonforwardmodelforallinversions:GeneralForwardModelforInversionLastUpdated:February20075ImpedanceReflectivityInverseWaveletSe

7、ismicInversiontriestoreversetheforwardmodel:InverseModelAcousticShearElasticLastUpdated:February20076AcousticImpedanceorShearImpedanceorElasticImpedanceImpedanceReflectivityAcousticImpedance=ShearImpedance=ElasticImpedance=Complicatedformula(later)Refl

8、ectivitySeismicSeismic=WaveletconvolvedwithReflectivityplusnoise.NotesTherearenomultiplesmodeled.Transmissionlossandgeometricspreadingareignored.Frequency-dependentabsorptionisignored.Thewaveletmaybetimevarying.Theeffectofconvolvingthew