拉梅参数叠前地震反演方法分析

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1、StudyonPrestackSeismicInversionMethodsofLam6ParametersLiuMiao(SolidEarthGeophysics)DirectedbyProf．YinXingyaoAbstractNowwiththeoil—gasexplorationgoingdeep，theaimbecomessubtleorcomplexreservoirs，andtheexplorationisbecomingmoreandmoredifficult．Inordertoimprovetheefficiencyofprospectingand

2、accuracyofprediction，itisnecessarytododetailedrockphysicalandAVOanalysis，tooptimizelithologyandfluidsensitiveparameters．Theseworksareofgreatimportanceforpredictingreservoirandidentifyinghydrocarbons．Thestudyonrockphysicalmodelsmakesupthemostimportantpartofrockphysics，whichlaysthefounda

3、tionforreservoirpredictionandfluiddiscrimination．Inconventionalrockphysicalmodels，theporefluidistreatedaSonephase．Butactuallythedistributionofthefluidisverycomplex，especiallywhenthegasispresent．Thisthesisgivesafulldescriptionofseveralfluiddistributionmodels．Andthenfluidsubstitutionisdo

4、neondifferentfluiddistributionmodelsaimingtoanalyzetheeffectoffluiddistributiononelasticparameters．ThenfluidsubstitutionandAVOarecombinedtogethertounderstandthevariationofreflectivityandamplitude诵thoffsetsfordifferentfluiddistributionmodels．HavingtherockphysicsandAVOtheoreticalbasisemp

5、loyed，thefoundationfortheinterpretationofelasticimpedanceandparametersisformed．Lamdparametersaresensitivelithologyandfluidindicators，whosephysicalmeaningandinterpretationmethodsaregivenbelow．Bycomparingthelamdparametersextractionmethodsindirectlyordirectlybasedonelasticimpedanceinversi

6、on，themethodofsimultaneousinversionforlamdparametersisfounded．Themodeltestandfielddataexampleprovethattheproposedmethodhasbetterresults，whichcallpredictthereservoirsuccessfully．Theultimateobjectivesofseismicexplorationarepredictionofreservoirandidentificationofhydrocarbons．However,ther

7、earemanyfluidindicators，whichhavedifferentidentifyingcapabilities．Basedonthecomprehensiveanalysisofconventionalfluidfactors，thispaperproposedanewfluidfactorwhichismoresensitivetothefluidchanges．Accordingtothefielddata,themostsensitivefluidindicatorsarefoundbysensitivityanalysisandroc