各向异性介质P—SV转换波速度分析方法及应用
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摘要
地球介质中广泛存在各向异性,使得地震时距关系多表现为复杂的非双曲形式。因此,基于双曲时距关系的速度分析方法不适用于各向异性介质转换波的速度分析。我们在垦71地区资料处理中采用了由转换波资料直接进行速度分析和各向异性参数估计的方法,获得了较好的处理效果。该方法应用改进的相似系数能量准则,可简化处理过程、避免求取转换点、减少误差累积、提高速度分析精度。
Because of the existence of anisotropic properties in real crustal medium, traveling time curve of seismic wave is becoming nonhyperbolic curve in general. Therefore, velocity analysis basing on hyperbolic traveling time curve is not sufficient for converted wave analysis in anisotropic media. Utilized the converted-wave data, velocity analysis and anisotropic parameters estimation in Ken 71 area, and the processing results are perfect. Making use of the improved semblance coefficients energy rule, the method avoids calculating converted-points, decreases error cumulation, simplifies the process and increases accuracy.
Because of the existence of anisotropic properties in real crustal medium, traveling time curve of seismic wave is becoming nonhyperbolic curve in general. Therefore, velocity analysis basing on hyperbolic traveling time curve is not sufficient for converted wave analysis in anisotropic media. Utilized the converted-wave data, velocity analysis and anisotropic parameters estimation in Ken 71 area, and the processing results are perfect. Making use of the improved semblance coefficients energy rule, the method avoids calculating converted-points, decreases error cumulation, simplifies the process and increases accuracy.
引文
[1]Tessmer G and Behle A.Common reflection point data stack-ing technique for converted waves.Geophys,1988,36:671～688
[2]Seriff A J and Sriram K P.P-SV reflection moveoutfor transversely isotropic media with a vertical symmetry axis.Geophysics,1991,56:1271～1274
[3]Tsvankin I and Thornsen L Nonhyperbolic reflection moveout in anisotropic media.Geophysics,1994,59:1290～1304
[4]Alkhalifah T.Velocity analysis using nonhyperbolic moveout in transversely isotropic media.Geophysics,1997,62(6):1839～1854
[5]Li X Y and Yuan J X.Converted-wave moveout and conver-sion-point equations in layered VTI media:theory and applica-tions.Journal of Applied Geophysics,2003,54:297～318
[6]Hake H.Three-term Taylor series for curves over lay-ered transversely isotropic ground.Geophysics,1984,32:828～850
[7]许士勇,马在田.快速有效的转换波共转换点叠加技术.地球物理学报,2002,45(4):558～568
[8]李录明,罗省贤.P-SV转换波速度分析及解释方法.石油地球物理勘探,1995,30(1):67～74
[9]朱衍镛.PS转换波的时差估计.石油地球物理勘探,1996,31(5):652～659
[10]李录明,罗省贤.海上多波地震资料处理方法及应用.成都理工学院学报,2002,29(1):1～8
[11]魏修成,刘洋.高精度转换波速度分析.石油勘探与开发,2000,2(27):57～59
[12]陈春继,李录明,罗省贤等.各向异性介质转换波速度分析方法.成都理工大学学报(自然科学版),2004,31(2):174～179
[13]Dai H C.Interactive estimation of anisotropic parameters and velocities from PS converted waves.SEG Technical Program Expanded Abstracts,2003:1577～1580
[14]Taner M Tand Koehler F.Velocity spectra-digital computer derivation and applications of velocity functions.Geophysics,1969,34:859～881
[15]Key S C and Smithson S B.New approach to seismic reflection event detection and velocity determination.Geophysics,1990,55(10):1057～1069
[2]Seriff A J and Sriram K P.P-SV reflection moveoutfor transversely isotropic media with a vertical symmetry axis.Geophysics,1991,56:1271～1274
[3]Tsvankin I and Thornsen L Nonhyperbolic reflection moveout in anisotropic media.Geophysics,1994,59:1290～1304
[4]Alkhalifah T.Velocity analysis using nonhyperbolic moveout in transversely isotropic media.Geophysics,1997,62(6):1839～1854
[5]Li X Y and Yuan J X.Converted-wave moveout and conver-sion-point equations in layered VTI media:theory and applica-tions.Journal of Applied Geophysics,2003,54:297～318
[6]Hake H.Three-term Taylor series for curves over lay-ered transversely isotropic ground.Geophysics,1984,32:828～850
[7]许士勇,马在田.快速有效的转换波共转换点叠加技术.地球物理学报,2002,45(4):558～568
[8]李录明,罗省贤.P-SV转换波速度分析及解释方法.石油地球物理勘探,1995,30(1):67～74
[9]朱衍镛.PS转换波的时差估计.石油地球物理勘探,1996,31(5):652～659
[10]李录明,罗省贤.海上多波地震资料处理方法及应用.成都理工学院学报,2002,29(1):1～8
[11]魏修成,刘洋.高精度转换波速度分析.石油勘探与开发,2000,2(27):57～59
[12]陈春继,李录明,罗省贤等.各向异性介质转换波速度分析方法.成都理工大学学报(自然科学版),2004,31(2):174～179
[13]Dai H C.Interactive estimation of anisotropic parameters and velocities from PS converted waves.SEG Technical Program Expanded Abstracts,2003:1577～1580
[14]Taner M Tand Koehler F.Velocity spectra-digital computer derivation and applications of velocity functions.Geophysics,1969,34:859～881
[15]Key S C and Smithson S B.New approach to seismic reflection event detection and velocity determination.Geophysics,1990,55(10):1057～1069
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