Sensitivity Analysis of P-Waves and S-Waves to Gas Hydrate in the Shenhu Area Using OBS

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摘要 Comparedtotowedstreamers,ocean-bottomseismometers(OBS)obtainbothS-wavedataandricherwavefieldinformation.Inthispaper,theinducedpolarizationmethodisusedtoconductwavefieldseparationonOBSdataobtainedfromtheShenhuareaintheSouthChinaSea.AcomparisonofthechangesinP-andS-waves,andacomprehensiveanalysisofgeologicalfactorswithinthearea,enableanalysisanddescriptionoftheoccurrenceofnaturalgashydrateinthestudyarea.ResultsshowanincreaseinP-wavevelocitywhennaturalgashydrateexistsintheformation,whereastheS-wavevelocityremainsalmostconstant,asS-wavescanonlypropagatethroughtherockskeleton.Therefore,thebottom-simulatingreflection(BSR)responseoftheP-waveisbetterthanthatoftheS-waveinthefrequencyanalysisprofile.Inawide-anglesection,therefractivewaveofthehydratelayerisevidentwhenusingP-wavecomponentsbutidentificationisdifficultwithS-wavecomponents.ThisvelocitymodelillustratesthesensitivityofPandS-wavecomponentstogashydrate.TheuseofthispolarizationmethodandresultsofanalysisprovidetechnicalandtheoreticalsupportforresearchonhydratedepositsandothergeologicalfeaturesintheShenhuarea.
机构地区 不详
出版日期 2018年01月11日(中国期刊网平台首次上网日期,不代表论文的发表时间)
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