1、IYllllllllllJlill5llll12lil7lllll5l(1ll嶝分類(lèi)號(hào)：P63壤乎太海碩士學(xué)位論文地震波吸收衰減與補(bǔ)償方法研究導(dǎo)師姓名職稱(chēng)申請(qǐng)學(xué)位級(jí)別論=盤(pán)：提交日期學(xué)位授予單位門(mén)哲劉永華副教授碩士學(xué)科專(zhuān)業(yè)名稱(chēng)地球探測(cè)與信息技術(shù)2009年5月25日論文答辯日期2009年5月30日長(zhǎng)安大學(xué)答辯委員會(huì)主席程建遠(yuǎn)研究員學(xué)位論文評(píng)閱人程建遠(yuǎn)研究員朱光明教授AbstractWhenseismicwavepropagatingint

2、heundergroundmediumastheactualsubsurfacematerialsareviscoelasticandinhomogeneous，madepartofseismicwaves’elasticenergyirreversibleconvertedintothermalenergyanddissipation，thustheamplitudeofseismicwaveiSattenuated，thiskind

3、ofattenuationwhichresultofformation’SviscoelasticiSabsorptionDuetoseismicwaves’high—frequencycomponentthanlow—frequencycomponentspreadfasterthatwillcreatethevelocitydispersion，whilevelocitydispersionledtothephaseofwavele

4、tdistortionTheabsorptionofformationwillcausethelossofverticalresolution，itisneededthatcompensationtheabsorbedenergybytheearthinthedataprocessingInverseQfilteringisadataprocessingtechnologyforenhancingtheresolutionofseism

5、icimagesItemploysawavepropagationreversalprocedurethatcompensatesforenergyabsorptionandcorrectswaveletdistortionduetovelocitydispersionVSPseismicrecords，duetoparticularobservationmodeofgroundexcitationandwellreception，SO

6、downgoingwavefieldhassmallinfluenceofnoiseandmoreaccuratelyreflecttheroleofformationoffilteringthanreflectionseismicrecordTherefore，Iextractionquah哆factorofstratumfromVSPdowngoingwavefieldandimplementinverseQfilteringtoV

7、SPandreflectionseismicrecordThispaperanalyzedtheattenuationmechanismsanddispersionmodelofseismicwavesinviscoelasticmediumAccordingtotheactualgeologicalmodel，synthesisthecorrespondingzero—offsetVSPrecordswhichincludeabsor

8、ptionanddispersioneffects，andcalculateabsorptioncurveCombinedwithresearchstatusofQestimationalgorithm，mainlyintroducedthebasicprinciplesofcommonandpracticalestimatedQvaluemethodwhichbasedonzero—offsetVSPdowngoingrecordin

9、g，andinversedtheQvaluefromthesyntheticandfieldzero—offsetVSPdowngoingrecords，respectivelyandevaluatedapplicationeffectoftheseveralmethodsAccordingtoinverseQfilteringalgorithmdomesticandforeignresearchpresentsituation，der

10、ivedHaleinverseQfilteringalgorithmandbasedontheprincipleofwavefieldcontinuationoftheinverseQfilteringalgorithm，appliedtwoinversefilteringmethodforthesynthesisofVSPrecordsandthegroundrecordwhichbasedontheprincipleofwavefi