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Volume 18 Issue 4
Aug.  2007
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The Offset-Domain Prestack Depth Migration with Optimal Separable Approximation

  • Received Date: 2018-07-15
  • Rev Recd Date: 2018-07-15
  • Publish Date: 2018-07-15
  • Theoffset-domainprestackdepthmigrationwithoptimalseparableapproximation,basedonthedoublesquarerootequation,isusedtoimagecomplexmediawithlargeandrapidvelocityvariations.Themethoddownwardcontinuesthesourceandthereceiverwavefieldssimultaneously.ThemixeddomainalgorithmwithforwardFourierandinverseFouriertransformisusedtoconstructthedoublesquarerootequationwavefieldextrapolationoperator.Thisoperatorseparatesvariablesinthewavenumberdomainandvariablesinthespacedomain.Thephaseoperationisimplementedinthewavenumberdomain,whereasthetimedelayforlateralvelocityvariationiscorrectedinthespacedomain.Themigrationalgorithmisefficientsincetheseismicdataarenotcomputedshotbyshot.ThedatasettestoftheMarmousimodelindicatesthattheoffset-domainmigrationprovidesasatisfiedseismicmigrationsectiononwhichcomplexgeologicstructuresareimagedinmediawithlargeandrapidlateralvelocityvariations.
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通讯作者: 陈斌, bchen63@163.com
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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The Offset-Domain Prestack Depth Migration with Optimal Separable Approximation

Abstract: Theoffset-domainprestackdepthmigrationwithoptimalseparableapproximation,basedonthedoublesquarerootequation,isusedtoimagecomplexmediawithlargeandrapidvelocityvariations.Themethoddownwardcontinuesthesourceandthereceiverwavefieldssimultaneously.ThemixeddomainalgorithmwithforwardFourierandinverseFouriertransformisusedtoconstructthedoublesquarerootequationwavefieldextrapolationoperator.Thisoperatorseparatesvariablesinthewavenumberdomainandvariablesinthespacedomain.Thephaseoperationisimplementedinthewavenumberdomain,whereasthetimedelayforlateralvelocityvariationiscorrectedinthespacedomain.Themigrationalgorithmisefficientsincetheseismicdataarenotcomputedshotbyshot.ThedatasettestoftheMarmousimodelindicatesthattheoffset-domainmigrationprovidesasatisfiedseismicmigrationsectiononwhichcomplexgeologicstructuresareimagedinmediawithlargeandrapidlateralvelocityvariations.

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