Tutorial on seismic interferometry.pdf

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1、GEOPHYSICS,VOL.75,NO.5
SEPTEMBER-OCTOBER2010;P.75A19575A209,15FIGS.10.1190/1.3457445Tutorialonseismicinterferometry:Part1—Basicprinciplesandapplications11233KeesWapenaar,DeyanDraganov,RoelSnieder,XanderCampman,andArieVerdelABSTRACTretrievalofseismicsurface-waveresponsesfromambientnoiseandth

2、esubsequenttomographicdeterminationofthesurface-Seismicinterferometryinvolvesthecrosscorrelationofre-wavevelocitydistributionofthesubsurface.Seismicinterferom-sponsesatdifferentreceiverstoobtaintheGreensfunctionbe-etryisnotrestrictedtoretrievingdirectwavesbetweenreceivers.tweenthesereceivers

3、.ForthesimplesituationofanimpulsiveInaclassicpaper,Claerboutshowsthattheautocorrelationoftheplanewavepropagatingalongthex-axis,thecrosscorrelationoftransmissionresponseofalayeredmediumgivestheplane-wavetheresponsesattworeceiversalongthex-axisgivestheGreensreflectionresponseofthatmedium.Thisis

4、essentially1Dreflect-functionofthedirectwavebetweenthesereceivers.Whentheed-waveinterferometry.Similarly,thecrosscorrelationofthesourcefunctionoftheplanewaveisatransient
asinexplorationtransmissionresponses,observedattworeceivers,ofanarbitraryseismologyoranoisesignal
asinpassiveseismology,t

5、hentheinhomogeneousmediumgivesthe3DreflectionresponseofthatcrosscorrelationgivestheGreensfunction,convolvedwiththemedium.Oneofthemainapplicationsofreflected-waveinterfer-autocorrelationofthesourcefunction.Direct-waveinterferome-ometryisretrievingtheseismicreflectionresponsefromambienttryalsohol

6、dsfor2Dand3Dsituations,assumingthereceiversnoiseandimagingofthereflectorsinthesubsurface.Acommonaresurroundedbyauniformdistributionofsources.Inthiscase,aspectofdirect-andreflected-waveinterferometryisthatvirtualthemaincontributionstotheretrieveddirectwavebetweenthesourcesarecreatedatpositionsw

7、herethereareonlyreceiversreceiverscomefromsourcesinFresnelzonesaroundstationarywithoutrequiringknowledgeofthesubsurfacemediumparame-points.Themainapplicationofdirect-waveinterferometryisthetersorofthepositionsoftheactualsources.INTRODUCTIONsourcepo