基于起伏地表的层析速度反演方法研究(英文)
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摘要
叠前深度偏移速度分析是地震数据处理方法研究的重点,是影响地震成像效果的关键技术之一。对于地表起伏、地下构造复杂的双复杂地区,常规的叠前偏移速度分析方法是将起伏面校正到固定基准面上或进行表层建模再进行偏移与速度分析。本文提出的基于起伏地表的层析速度反演方法从起伏地表直接进行速度场的更新,可以提高层析速度反演的精度与效率。首先介绍基于起伏地表的角度域共成像点道集的提取方法,以此为基础阐述了起伏地表层析速度反演方法。起伏地表模型和实际资料试算验证了本文方法的有效性。
Pre-stack depth migration velocity analysis is one of the key techniques influencing image quality.As for areas with a rugged surface and complex subsurface,conventional prestack depth migration velocity analysis corrects the rugged surface to a known datum or designed surface velocity model on which to perform migration and update the velocity.We propose a rugged surface tomographic velocity inversion method based on angle-domain common image gathers by which the velocity field can be updated directly from the rugged surface without static correction for pre-stack data and improve inversion precision and efficiency.First,we introduce a method to acquire angle-domain common image gathers (ADCIGs) in rugged surface areas and then perform rugged surface tomographic velocity inversion.Tests with model and field data prove the method to be correct and effective.
Pre-stack depth migration velocity analysis is one of the key techniques influencing image quality.As for areas with a rugged surface and complex subsurface,conventional prestack depth migration velocity analysis corrects the rugged surface to a known datum or designed surface velocity model on which to perform migration and update the velocity.We propose a rugged surface tomographic velocity inversion method based on angle-domain common image gathers by which the velocity field can be updated directly from the rugged surface without static correction for pre-stack data and improve inversion precision and efficiency.First,we introduce a method to acquire angle-domain common image gathers (ADCIGs) in rugged surface areas and then perform rugged surface tomographic velocity inversion.Tests with model and field data prove the method to be correct and effective.
引文
Biondi,B.,and Symes,W.W.,2004,Angle-domain common-imaging gathers for migration velocity analysis by wavefield continuation imaging:Geophysics,69(5), 1283-1289.
Cheng,G.,2004,The theory of tomography and application:PhD Thesis,Tongji University,Shanghai, China.
Gray,S.H.,2005,Gaussian beam migration of common shot records:Geophysics,70(4),S71 - S77.
Langan,R.T.,1985,Tracing of rays through heterogeneous media:An accurate and efficient procedure:Geophysics, 50(6),1456-1465.
Li,Z.C,Yao,Y.X,Ma,Z.T.,and Wang,H.Z.,2003, Velocity analysis and modeling on wave-equation CIGs: The Journal of China Geophysics,46,86-93.
Liu,Z.,and Bleistein,N.,1995,Migration velocity analysis:Theory and an iterative algorithm:Geophysics, 60(1),142-153.
Liu,Z.,1997,An analytical approach to migration velocity analysis:Geophysics,62(4),1238 - 1249.
Pei,D.H.,2009,Three-dimensional travel-time tomography via LSQR with regularization:79th Ann. Internat.Mtg.,Soc.Explor.Geophys.,Expanded Abstracts,4004 - 4008.
Prucha,M.,Biondi,B.,and Symes,W.,1999,Angle-domain common image gathers by wave-equation migration:69th Ann.Internat.Mtg.,Soc.Explor. Geophys.,Expanded Abstracts,824 - 827.
Sava,P.,and,Fomel,S.,2003,Angle-domain common-imaging gathers by wavefield continuation methods: Geophysics,68(3),1065 - 1074.
Stork,C,1992,Reflection tomography in the post-migrated domain:Geophysics,57(5),680 - 692. vWoodward,M.J.,1992,Wave-equation tomography: Geophysics,57(1),15-26.
Xia,R,Ren,Y.Q.,and Jin,S.W.,2006,Residual migration velocity analysis using common angle imaging gathers: 76th Ann.Internat.Mtg.,Soc.Explor.Geophys., Expanded Abstracts,2455 - 2459.
Xu,S.,and Chauris,H.,2001,Common-angle migration:A strategy for imaging complex media:Geophysics,66(6), 1877-1894.
Ye,Y.M.,2009,Preserved-amplitude pre-stack depth migration in areas with dual-complexity:PhD Thesis, China University of Petroleum(East China).
Yue,Y.B.,Li,Z.C,Zhang,P.,Zhou,X.R,and Qin,N., 2010,Gaussian beam pre-stack depth migration under complex topographic conditions:Applied Geophysics, 7(2),143-148.
Zhang,K.,Li,Z.C,and Zeng,T.S.,2010,The residual curvature migration velocity analysis on angle domain common imaging gathers:Applied Geophysics,7(1),49 -56.
Cheng,G.,2004,The theory of tomography and application:PhD Thesis,Tongji University,Shanghai, China.
Gray,S.H.,2005,Gaussian beam migration of common shot records:Geophysics,70(4),S71 - S77.
Langan,R.T.,1985,Tracing of rays through heterogeneous media:An accurate and efficient procedure:Geophysics, 50(6),1456-1465.
Li,Z.C,Yao,Y.X,Ma,Z.T.,and Wang,H.Z.,2003, Velocity analysis and modeling on wave-equation CIGs: The Journal of China Geophysics,46,86-93.
Liu,Z.,and Bleistein,N.,1995,Migration velocity analysis:Theory and an iterative algorithm:Geophysics, 60(1),142-153.
Liu,Z.,1997,An analytical approach to migration velocity analysis:Geophysics,62(4),1238 - 1249.
Pei,D.H.,2009,Three-dimensional travel-time tomography via LSQR with regularization:79th Ann. Internat.Mtg.,Soc.Explor.Geophys.,Expanded Abstracts,4004 - 4008.
Prucha,M.,Biondi,B.,and Symes,W.,1999,Angle-domain common image gathers by wave-equation migration:69th Ann.Internat.Mtg.,Soc.Explor. Geophys.,Expanded Abstracts,824 - 827.
Sava,P.,and,Fomel,S.,2003,Angle-domain common-imaging gathers by wavefield continuation methods: Geophysics,68(3),1065 - 1074.
Stork,C,1992,Reflection tomography in the post-migrated domain:Geophysics,57(5),680 - 692. vWoodward,M.J.,1992,Wave-equation tomography: Geophysics,57(1),15-26.
Xia,R,Ren,Y.Q.,and Jin,S.W.,2006,Residual migration velocity analysis using common angle imaging gathers: 76th Ann.Internat.Mtg.,Soc.Explor.Geophys., Expanded Abstracts,2455 - 2459.
Xu,S.,and Chauris,H.,2001,Common-angle migration:A strategy for imaging complex media:Geophysics,66(6), 1877-1894.
Ye,Y.M.,2009,Preserved-amplitude pre-stack depth migration in areas with dual-complexity:PhD Thesis, China University of Petroleum(East China).
Yue,Y.B.,Li,Z.C,Zhang,P.,Zhou,X.R,and Qin,N., 2010,Gaussian beam pre-stack depth migration under complex topographic conditions:Applied Geophysics, 7(2),143-148.
Zhang,K.,Li,Z.C,and Zeng,T.S.,2010,The residual curvature migration velocity analysis on angle domain common imaging gathers:Applied Geophysics,7(1),49 -56.
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