TI介质偏移速度建模研究
|
摘要
经过多年的研究发展,各向异性叠前深度偏移算法已经趋于完善.然而,在地震资料处理过程中导致成像结果不理想的主要原因还是由于建立的地层参数场不够精确.当地层参数接近其真实值时,基于波动方程的剩余曲率建模方法由于不受构造的影响,能够在各向异性和横向变速介质中进行速度分析,所以得到了广泛的研究.本文从偏移结果中抽取共成像道集,然后通过交互运用叠前深度偏移和参数更新实现各向异性偏移速度建模.对理论模型和实际资料进行的试算表明,该方法具有较强的适应性,能极大改善VTI介质反射界面成像效果和分辨率.
Anisotropic prestack depth migration becomes closer to perfection since after many years of research and development. In seismic processing, however, inaccurate parameters estimation of the media is the main reason for poor imaging quality. When the estimated parameters of VTI media are close to their real values, the residual curvature analysis modeling method of anisotropic migration velocity analysis based on wave equation is applicable to anisotropic and laterally varying media because it is not associated with the complex geological condition. We will obtain a velocity modeling by anisotropic migration velocity analysis with the common imaging gathers extracted from a migration result. Numerical experiments and field data show that this method could improve the quality of migration results and obtain a robust image of VTI.
Anisotropic prestack depth migration becomes closer to perfection since after many years of research and development. In seismic processing, however, inaccurate parameters estimation of the media is the main reason for poor imaging quality. When the estimated parameters of VTI media are close to their real values, the residual curvature analysis modeling method of anisotropic migration velocity analysis based on wave equation is applicable to anisotropic and laterally varying media because it is not associated with the complex geological condition. We will obtain a velocity modeling by anisotropic migration velocity analysis with the common imaging gathers extracted from a migration result. Numerical experiments and field data show that this method could improve the quality of migration results and obtain a robust image of VTI.
引文
[1]Thomsen L.Weak elastic anisotropy.Geophysics,1986,51(3):1954~1966
[2]Larner K,Cohen J K.Migration error intransverselyisotropic media withlinear velocity variation in depth.Geophysics,1993,58(10):1454~1467
[3]Alkhalifah T.Larner K.Migration error in transversely isotropic media.Geophysics,1994,59(9):1405~1418
[4]Alkhalifah T,Tsvankin I.Velocity analysis for transversely isotropic media.Geophysics,1995,60(5):1550~1566
[5]Sarkar D,Tsvankin I.Migration velocity analysis in factorized VTI media.73rd Ann.Internat.Mtg.,Soc.Expl.Geophys.,Expanded Abstracts,2003.2072~2075
[6]Sarkar D,Tsvankin I.Analysis of image gathers in factorized VTI media.Geophysics,2003,68(6):2016~2025
[7]Liu Z Y.An analytical approach to migration velocity analysis.Geophysics,1997,62(4):1238~1249
[8]陈志德,刘宽,李成斌.三维叠前深度偏移速度分析及蒙特卡洛自动层速度拾取.地球物理学报,2002,45(2):246~254Chen Z D,Liu Z K,Li C B.3-Dpre-stack depth migration velocity analysis and automatic Monte Carlo velocity picking in depth.Chinese J.Geophys.(in Chinese),2002,45(2):246~254
[9]王昌龙,张叔伦,赵景霞等.基于控制照明的合成震源记录交互剩余偏移速度分析.地球物理学报,2007,50(3):860~867Wang C L,Zhang S L,Zhao J X,et al.Synthetic source record interactive residual migration velocity analysis based on controlled illumination.Chinese J.Geophys.(in Chinese),2007,50(3):860~867
[10]Qin Y,Zhang Z,Li S.CDP mapping in tilted transversely isotropic(TTI)media.Part I:Method and effectiveness.Geophysical Prospecting,2003,51(4):315~324
[11]Qin Y,Zhang Z,Li S.CDP mapping in tilted transversely isotropic(TTI)media.Part II:Velocity analysis by combining CDP mapping with a genetic algorithm.Geophysical Prospecting,2003,51(4):325~332
[12]Han QY,Wu R S.Depth imaging in strongly heterogeneous VTI media.74th Ann.Internat.Mtg.,Soc.Expl.Geophys.,Expanded Abstracts,2004.1061~1064
[13]李振春,姚云霞,马在田等.波动方程法共成像点道集偏移速度建模.地球物理学报,2003,46(1):86~93Li Z C,Yao Y X,Ma Z T,et al.Common imaging point gather migration velocity modeling based on wave equation.Chinese J.Geophys.(in Chinese),2003,46(1):86~93
[14]Tsvankin I,Thomsen L.Inversion of reflection traveltimes for transverse isotropy.Geophysics,1995,60(4):1095~1107
[2]Larner K,Cohen J K.Migration error intransverselyisotropic media withlinear velocity variation in depth.Geophysics,1993,58(10):1454~1467
[3]Alkhalifah T.Larner K.Migration error in transversely isotropic media.Geophysics,1994,59(9):1405~1418
[4]Alkhalifah T,Tsvankin I.Velocity analysis for transversely isotropic media.Geophysics,1995,60(5):1550~1566
[5]Sarkar D,Tsvankin I.Migration velocity analysis in factorized VTI media.73rd Ann.Internat.Mtg.,Soc.Expl.Geophys.,Expanded Abstracts,2003.2072~2075
[6]Sarkar D,Tsvankin I.Analysis of image gathers in factorized VTI media.Geophysics,2003,68(6):2016~2025
[7]Liu Z Y.An analytical approach to migration velocity analysis.Geophysics,1997,62(4):1238~1249
[8]陈志德,刘宽,李成斌.三维叠前深度偏移速度分析及蒙特卡洛自动层速度拾取.地球物理学报,2002,45(2):246~254Chen Z D,Liu Z K,Li C B.3-Dpre-stack depth migration velocity analysis and automatic Monte Carlo velocity picking in depth.Chinese J.Geophys.(in Chinese),2002,45(2):246~254
[9]王昌龙,张叔伦,赵景霞等.基于控制照明的合成震源记录交互剩余偏移速度分析.地球物理学报,2007,50(3):860~867Wang C L,Zhang S L,Zhao J X,et al.Synthetic source record interactive residual migration velocity analysis based on controlled illumination.Chinese J.Geophys.(in Chinese),2007,50(3):860~867
[10]Qin Y,Zhang Z,Li S.CDP mapping in tilted transversely isotropic(TTI)media.Part I:Method and effectiveness.Geophysical Prospecting,2003,51(4):315~324
[11]Qin Y,Zhang Z,Li S.CDP mapping in tilted transversely isotropic(TTI)media.Part II:Velocity analysis by combining CDP mapping with a genetic algorithm.Geophysical Prospecting,2003,51(4):325~332
[12]Han QY,Wu R S.Depth imaging in strongly heterogeneous VTI media.74th Ann.Internat.Mtg.,Soc.Expl.Geophys.,Expanded Abstracts,2004.1061~1064
[13]李振春,姚云霞,马在田等.波动方程法共成像点道集偏移速度建模.地球物理学报,2003,46(1):86~93Li Z C,Yao Y X,Ma Z T,et al.Common imaging point gather migration velocity modeling based on wave equation.Chinese J.Geophys.(in Chinese),2003,46(1):86~93
[14]Tsvankin I,Thomsen L.Inversion of reflection traveltimes for transverse isotropy.Geophysics,1995,60(4):1095~1107
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心