地震层析成像在含天然气水合物地层速度建模中的应用分析

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1、万方数据ResearchonapplicationofseismictomographyinthegashydratebearingstratainvelocitymodelingGashydrateisakindofnewgreenenergywhichhasgreatpotential，andiswidelydistributedinthecontinentalmarginandhighlatitudepermafrost．Thedifferencesofphysicalpropertiesbetweengashyd

2、ratelayersandsurroundingrocksmakesitpossibletoapplygeophysicalmethodsintheexploration．Thebottomsimulatingreflector(BSR)andvelocityanomalyarethemostimportantgeophysicalresponsecharacteristics．However，BSRCanonlyhelptoverifytheexistenceofthegashydrate，andindicatethe

3、bottomofthegashydratelayer．Itmakesitimpossibleforpepoleforecastthedistributionandcontentofthehydrate．Thus，itisimportanttofindsomemoreeffectiveways．Velocityisoneofthemostimportantphysicalparametersofundergroundsedimemarylayersanditisverycloselyrelatedwiththeporosi

4、tyandsaturationetc．Therefore，accurateestimatethevelocityofundergroundsedimentarylayeristhekeytotheevaluationandpredictionofgashydrateresources．Thereareseveralvelocitymodelingmethodssuchasthestackvelocityanalysis，themigrationvelocityanalysisandtheseismictomography

5、．Comparedtotheformertwo，theseismictomographyCanbuildmoreprecisemodelofundergroundmediumvelocity,betterrevealthesubsurfacestructure，geologicalstructureandreservoirThispapermainlystudiesthereflectionwavetraveltimetomography,theprocessisasfollows：(1)Reflectiontravel

6、timedatapickingup．Traveltimedataisthebasisofthetomography,aimingatthetargetareawithcomplexgeologicalconditions，thespecialgeologicalbodydevelopmentsituation,usingmulti-domainjointpickupanddiffractionwavesuppressingideas，improvetheprecisionandaccuracyofthepickup．(2

7、)Establishmentanddiscretizationmodel．Consideringthereflcetiontraveltimetomographyisnotonlytodeterminetheformationvelocityvariationsinverticaland万方数据horizontaldirection,butalsodeterminethedepositedlayerinterfaceofupsanddowns．Thus，thepaperusesirregulargridstodiscre

8、temediummodel,toensuretheprecisionofcalculation．(3)Raytracingforwardsimulation．Raytracingisanimportantpartoftraveltimetomographyforthecalculationoftraveltimean