转换波波动方程叠前深度偏移
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摘要
克希霍夫叠前时间偏移被广泛运用于转换波地震成像领域,该方法具有计算效率高、速度模型易于获取的优点。但是,纵横波速度差使纵波和转换波的成像在时间域不匹配,且克希霍夫偏移也无法较好地处理多次到达和保幅等问题。这里提出一种基于波动方程的转换波叠前深度偏移方法,以改善克希霍夫时间偏移的不足。
Kirchhoff pre-stack time migration has being widely used in the field of converted wave imaging. This method has two advantages,high computational efficiency and acquiring velocity model easily.However,for the velocity discrepancy between P and S wave,the images cannot correspond to each other at temporal domain,and Krchhoff migration cannot handle problems well, such as multi-path,amplitude preservation.In the paper,we introduce a converted wave migration based on wave equation,which supposed to overcome the shortcoming of kirchhoff time migration.
Kirchhoff pre-stack time migration has being widely used in the field of converted wave imaging. This method has two advantages,high computational efficiency and acquiring velocity model easily.However,for the velocity discrepancy between P and S wave,the images cannot correspond to each other at temporal domain,and Krchhoff migration cannot handle problems well, such as multi-path,amplitude preservation.In the paper,we introduce a converted wave migration based on wave equation,which supposed to overcome the shortcoming of kirchhoff time migration.
引文
[1]肖思和,马昭军.转换波处理一些问题及对策[J].物探化探计算技术,2009,31(6):535.
[2]LI X Y,DAI H,YUAN J.Converted-wave imaging in inhomogeneous,anisotropic media:PartⅡ-prestack migration.63rd EAGE Conference[M]. Expanded Abstracts,2001.
[3]李录明,罗省贤.转换波叠前深度偏移[J].勘探地球物理进展,2005(6):183.
[4]杜启振,侯波.矢量波场弹性波Kirchhoff偏移[J]. Applied Geophysics,2008(4):284.
[5]张会星,宁书年.弹性波动方程叠前逆时偏移[J].中国矿业大学学报,2002(9):371.
[6]STOFFA P L.FOKKEMA J T.FREIRE R M.et al.Split-step Fourier migration[J].Geophysics, 1990(55):410.
[7]RISTOW D.RuHL T.Fourier finite-difference migration [J].Geophysics,1994(59):1882.
[8]DE HOOP,M V,LE ROUSSEAU J H.WU R S. Generalization of the phase-screen approximation for the scattering of acoustic waves[J].Wave Motion. 2000(31):43.
[9]张致付,刘洪,陈景波,等.地震偏移的最优可分近似算法实现[J].地球物理学报,2005(11):1422.
[10]ZHANG J H.WANG S Q,YAO Z X.Accelerating 3D Fourier migration with Graphics Processing Units ??[J].Geophysics,2009(74):129.
[11]SAVA P,FOMEL S.Angle-domain common-image gathers by wavefield continuation method[J]. Geophysics,2003(68):1065.
[12]SAVA P,FOMEL S.Wave-equation common-angle gathers for converted waves.75th Annual International Meeting[M].SEG,Expanded Abstracts, 2005.
[13]BIONDI B,SYMES W.Angle-domain commonimage gathers for migration velocity analysis by wavefield-continuation imaging[J].Geophysics. 2004(69):1283.
[2]LI X Y,DAI H,YUAN J.Converted-wave imaging in inhomogeneous,anisotropic media:PartⅡ-prestack migration.63rd EAGE Conference[M]. Expanded Abstracts,2001.
[3]李录明,罗省贤.转换波叠前深度偏移[J].勘探地球物理进展,2005(6):183.
[4]杜启振,侯波.矢量波场弹性波Kirchhoff偏移[J]. Applied Geophysics,2008(4):284.
[5]张会星,宁书年.弹性波动方程叠前逆时偏移[J].中国矿业大学学报,2002(9):371.
[6]STOFFA P L.FOKKEMA J T.FREIRE R M.et al.Split-step Fourier migration[J].Geophysics, 1990(55):410.
[7]RISTOW D.RuHL T.Fourier finite-difference migration [J].Geophysics,1994(59):1882.
[8]DE HOOP,M V,LE ROUSSEAU J H.WU R S. Generalization of the phase-screen approximation for the scattering of acoustic waves[J].Wave Motion. 2000(31):43.
[9]张致付,刘洪,陈景波,等.地震偏移的最优可分近似算法实现[J].地球物理学报,2005(11):1422.
[10]ZHANG J H.WANG S Q,YAO Z X.Accelerating 3D Fourier migration with Graphics Processing Units ??[J].Geophysics,2009(74):129.
[11]SAVA P,FOMEL S.Angle-domain common-image gathers by wavefield continuation method[J]. Geophysics,2003(68):1065.
[12]SAVA P,FOMEL S.Wave-equation common-angle gathers for converted waves.75th Annual International Meeting[M].SEG,Expanded Abstracts, 2005.
[13]BIONDI B,SYMES W.Angle-domain commonimage gathers for migration velocity analysis by wavefield-continuation imaging[J].Geophysics. 2004(69):1283.
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