射线平均速度对反射波时距方程简化的效果分析
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摘要
介绍在简化的双曲型时距曲线方程中应用射线平均速度计算多层介质地震反射波旅行时的方法与效果。地震反射波时距方程的估计精度对地震勘探记录的动校正及偏移成像质量的影响很大。本文提出利用射线平均速度计算反射波旅行时的方法,并用于多层介质中层状均匀各向同性模型和层状弱各向异性模型中计算反射波旅行时。通过对比这两种模型中用射线平均速度、均方根速度、平均速度,以及非双曲线时距方程计算的反射波旅行时与其理论值的误差,认为在炮检距较大的情况下,通过在双曲时距方程中引入射线平均速度,可以比较更精确的计算出反射波旅行时。
The authors introduce methods and advantages which were used ray average velocity to calculate the multilayered media of seismic reflected wave travel time in the hyperbolic equation.Estimating accuracy of seismic reflection wave time-distance equation,which had great influenced on quality of the records of seismic exploration NMO and imaging and migration.This paper was introduced ray average velocity to calculate reflected wave traveltime in layered isotropic media and layered weakly anisotropic media.As for these two models,the average velocity of ray,the average velocity,the root-mean-square velocity and no-hyperbolic curve equation was used to calculate the travel time of reflected wave,which compared with the analytical value.The results of calculation show that the effect of using the average velocity of ray is the best in the larger offset and hyperbolic time-distance curve equation.
The authors introduce methods and advantages which were used ray average velocity to calculate the multilayered media of seismic reflected wave travel time in the hyperbolic equation.Estimating accuracy of seismic reflection wave time-distance equation,which had great influenced on quality of the records of seismic exploration NMO and imaging and migration.This paper was introduced ray average velocity to calculate reflected wave traveltime in layered isotropic media and layered weakly anisotropic media.As for these two models,the average velocity of ray,the average velocity,the root-mean-square velocity and no-hyperbolic curve equation was used to calculate the travel time of reflected wave,which compared with the analytical value.The results of calculation show that the effect of using the average velocity of ray is the best in the larger offset and hyperbolic time-distance curve equation.
引文
[1]Taner TM,Koehler F.Velocity spectra-Digital computer derivation and applicationsof velocity functions.Geophysics,1969,24:859~881.
[2]Thomsen L A.Weak elastic anisotropy.Geophysics,1986,51:1954-1966.
[3]Tsvankin L,Thomsen L.Nonhyperbolicreflection moveout in anisotropic media.Geophysics.1994,59:1290-1304.
[4]Tsvankin l.Normal moveout from dippingreflectors in anisotropic media.Geophysics,1995,60:268-284.
[5]AlkhalifahT,Tsvankin I.Velocity analysis itransversely isotropic media.Geophysics1995,60:1550-1566.
[6]AbdulFattah,Tsvankin.Nonhyperbolireflection moveout for horizontatransverse isotropy.Geophysics,199863:1738-1753.
[7]刘洋.反射波分式展开式时距方程及其精度分析.石油物探,2003,42(4):441-447.
[8]刘洋,魏修成.几种反射波时距方程的比较。地球物理学进展,2005,20(3):645-653.
[9]卢明辉,唐建侯等.VTI介质P波非双曲时差分析.地球物理学进展,2005,20(2):328-331.
[10]夏洪瑞,葛川庆等.具有截断误差校正的广角反射NMO方法.石油物探,2005,44(2):15-157.
[11]李正文,贺振华.勘查技术工程学.地质出版社,2003.
[12]朱广生,陈传仁,桂志先.勘探地震学教程.武汉大学出版社,2005.
[13]罗小明,凌云等.井地联合提取VTI介质各向异性参数.地学前缘,2005,12(4):576-580.
[14]罗小明,王世瑞.纵波VTI介质各向异性参数的求取.物探与化探,2006,30(3):233-235.
[2]Thomsen L A.Weak elastic anisotropy.Geophysics,1986,51:1954-1966.
[3]Tsvankin L,Thomsen L.Nonhyperbolicreflection moveout in anisotropic media.Geophysics.1994,59:1290-1304.
[4]Tsvankin l.Normal moveout from dippingreflectors in anisotropic media.Geophysics,1995,60:268-284.
[5]AlkhalifahT,Tsvankin I.Velocity analysis itransversely isotropic media.Geophysics1995,60:1550-1566.
[6]AbdulFattah,Tsvankin.Nonhyperbolireflection moveout for horizontatransverse isotropy.Geophysics,199863:1738-1753.
[7]刘洋.反射波分式展开式时距方程及其精度分析.石油物探,2003,42(4):441-447.
[8]刘洋,魏修成.几种反射波时距方程的比较。地球物理学进展,2005,20(3):645-653.
[9]卢明辉,唐建侯等.VTI介质P波非双曲时差分析.地球物理学进展,2005,20(2):328-331.
[10]夏洪瑞,葛川庆等.具有截断误差校正的广角反射NMO方法.石油物探,2005,44(2):15-157.
[11]李正文,贺振华.勘查技术工程学.地质出版社,2003.
[12]朱广生,陈传仁,桂志先.勘探地震学教程.武汉大学出版社,2005.
[13]罗小明,凌云等.井地联合提取VTI介质各向异性参数.地学前缘,2005,12(4):576-580.
[14]罗小明,王世瑞.纵波VTI介质各向异性参数的求取.物探与化探,2006,30(3):233-235.
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