长排列条件下三种时距曲线方程精度分析
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摘要
本文研究了长排列情况下,三种时距曲线方程(常规双曲线时距曲线方程、包含高阶项和包含各向异性参数的两种非双曲线时距曲线方程)描述地震波旅行时的特点和精度。研究结果表明:在长排列的情况下,高阶、各向异性的非双曲线速度分析方法可以得到精度较高的叠加速度和层速度,进而获得相对较好的动校正结果及叠加效果。当排列长度过大时,高阶非双曲线方法不能得到相对准确的叠加速度,各向异性的非双曲线方法具有更好的适用范围。
Under long spread condition, using 3 time-distance curve equations (Routine-hyperbolic curve time-distance equation, and two non-hyperbolic curve time-distance equations which containing high order and anisotropic parameters) to describe the characteristics and accuracies of seismic wave propagation were studied in this paper. The study results show that under long spread condition the high order and anisotropic non-hyperbolic curve velocity analysis method could get accurate stacking velocity and interval velocity, as a result better NMO and stacking results can be achieved. But when the spread is too long, accurate stacking velocity could not be obtained with high order non-hyperbolic curve method, and the anisotropic non-hyperbolic curve has a wider application scope.
Under long spread condition, using 3 time-distance curve equations (Routine-hyperbolic curve time-distance equation, and two non-hyperbolic curve time-distance equations which containing high order and anisotropic parameters) to describe the characteristics and accuracies of seismic wave propagation were studied in this paper. The study results show that under long spread condition the high order and anisotropic non-hyperbolic curve velocity analysis method could get accurate stacking velocity and interval velocity, as a result better NMO and stacking results can be achieved. But when the spread is too long, accurate stacking velocity could not be obtained with high order non-hyperbolic curve method, and the anisotropic non-hyperbolic curve has a wider application scope.
引文
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[5]张文生,何樵登.二维横向各向同性介质的伪谱法正演模拟.石油地球物理勘探,1997,33(3):310~320
[2]Thomsen L.Weak elastic anisotropy.Geophysics,1986,51(10):1954~1966
[3]Tsvankin I,Thomsen L.Nonhyperbolic reflection move-out in anisotropic media.Geophysics,1994,59(8):1290~1304
[4]Alkhalifah T,Tsvankin I.Velocity analysis for trans-versely isotropic media.Geophysics,1995,60(5):1550~1566
[5]张文生,何樵登.二维横向各向同性介质的伪谱法正演模拟.石油地球物理勘探,1997,33(3):310~320
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