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偏移方程
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  migration equation
    THE 3-D HIGH ORDER DEPTH MIGRATION EQUATION AND ITS NUMERICAL SOLUTION METHOD
    三维高阶深度偏移方程及其数值求解方法
短句来源
    frequency dispersion is concerned with the accuracies of migration equation and difference;
    频散现象的产生与偏移方程的精度和差分的精度有关;
短句来源
    The compatibility of the difference equation with the partial differential equation and stability of splitting-up algorithm for solution of higher order migration equation are discussed.
    本文讨论用分裂算法解高阶偏移方程时所用的有限差分方程与原偏微分方程的相容性和算法的稳定性。
短句来源
    This paper deals with the way to develop the constant velocity median equation of geophysical data processing to the variable velocity medium with the aim of obtaining the variable velocity medium migration equation.
    本文将地球物理数据处理中的恒速介质偏移方程,推广到变速介质情况,得到变速介质偏移方程
短句来源
    The result turns out that the constant velocity medium migration equation is only a special case as the conclusion drawn in the paper stated.
    结果表明,恒速介质偏移方程仅是本文所得结论的一种特例。
短句来源
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  “偏移方程”译为未确定词的双语例句
    The success of computerization of Claerbout's migration and the large dip-angle migration might be summed up as "Pure Phase Filter", it is suitable for the processing of the amplitude reservation.
    克莱鲍特(Clearbout)偏移方程和大倾角偏移方程在计算机上实现可以归结为纯相位滤波,因而适用于振幅保持处理.
短句来源
    In summary, this migration process is composed of the following steps: first, by Fourier transform, a seismic section is transformed from time domain to frequency domain; then, for each frequency, the wave field is extrapolated from known depth Z to unknown depth Z+△Z by making use of the thin lens term equation and the diffraction term equation; finally, the component extrapolated results for all frequencies are summed up to form a resultant migration result at depth Z+△Z.
    上述的这种偏移方法过程可以归结为:首先对地震剖面作傅里叶变换,由时间域转换到频率域,然后对每一固定频率,利用薄透镜项和绕射项偏移方程进行外推,即把已知深度Z的波场外推到未知深度Z+ΔZ的波场,最后把Z+ΔZ处所有频率成分外推的结果累加求和,得到最终的偏移结果。
短句来源
    Its essential is that the continuation of 3D migration wave equation is performed twice in τ(or ζ) direction using a half step respectively.
    该方法是将三维偏移方程在τ(或ζ)方向分两步分别以二分之一步长进行延拓。
短句来源
    Starting from the 45° depth migration cquation, we introduce a parameter called Mirectional derivativeu and incorporate tht refraction effect term caused by lateral velocity variation into the directional derivative so as to make the depth migration be formally consistent with the corresponding time migration.
    作者从45°深度偏移方程出发,引出方向导数,并将速度横向变化所引起的折射效应项纳入此方向导数内,使所构造的深度偏移方法在形式上与相应的时间偏移方法一致。
短句来源
    3-D migration equationswhich have the standard form of 45° equation can be solved by adopting the differ-ence equatiton.
    凡是具有经典45°形式的三维偏移方程都可用此差分方程求解。
短句来源
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  migration equation
We demonstrate that some cost of living variables, when included in a migration equation, enter with the expected sign and are statistically significant.
      
In our analysis we recognize the endogeneity of job change in the migration equation and estimate it separately in the model.
      
This paper presents an analysis in interprovincial migration, carried out in order to develop a migration equation for a multi-regional labour market model.
      
Estimation of a migration equation per age group showed differences in migration behaviour between age groups.
      
This simpler case brings you quickly to the migration equation.
      


The success of computerization of Claerbout's migration and the large dip-angle migration might be summed up as "Pure Phase Filter", it is suitable for the processing of the amplitude reservation. Merely the wave dispersion, the convergency of diffracted wave is, in most cases, incomplete. This paper deals with the relationship between the higher partial differential equation and the wave dispersion. The wave-number curves of cubic, quartic and quintic partial differential equation, the differencing equation...

The success of computerization of Claerbout's migration and the large dip-angle migration might be summed up as "Pure Phase Filter", it is suitable for the processing of the amplitude reservation. Merely the wave dispersion, the convergency of diffracted wave is, in most cases, incomplete. This paper deals with the relationship between the higher partial differential equation and the wave dispersion. The wave-number curves of cubic, quartic and quintic partial differential equation, the differencing equation and its algorithm for 55°migration have been derived.

克莱鲍特(Clearbout)偏移方程和大倾角偏移方程在计算机上实现可以归结为纯相位滤波,因而适用于振幅保持处理.但由于此两种方法的波散现象,存在绕射波收敛不完全等问题.本文讨论高阶偏微分方程与波散的关系,给出了三阶、四阶和五阶偏微分方程的波数曲线,提出了55度偏移的差分方程及其在计算机上的算法.

The alias, frequency dispersion and lateral resolution of migrated seismic section are analysed in detail in this paper. The detailed analysis leads to the conclusion: the alias on migrated section has nothing to do with migration methods, but mainly relates to the samplings of record and operator, and their resamples; frequency dispersion is concerned with the accuracies of migration equation and difference; and the lateral resolution is related to equation accuracy and sampling rate. The application of more...

The alias, frequency dispersion and lateral resolution of migrated seismic section are analysed in detail in this paper. The detailed analysis leads to the conclusion: the alias on migrated section has nothing to do with migration methods, but mainly relates to the samplings of record and operator, and their resamples; frequency dispersion is concerned with the accuracies of migration equation and difference; and the lateral resolution is related to equation accuracy and sampling rate. The application of more accurate equation and more precise sampling to migration processing is not only conducive to correct positioning of seismic data, but also necessary for improving the lateral resolution.

本文对偏移剖面上的假频、频散和横向分辨力作了比较系统的论述。通过这种讨论,说明了偏移剖面上的假频与偏移方法无关,而主要与记录和算子的采样及重采样有关;频散现象的产生与偏移方程的精度和差分的精度有关;而横向分辨力则与方程的精度和采样率有关。偏移时应用更精确的方程和更精确的采样,不但对偏移归位有好处,而且对提高横向分辨力也是必须的。

In many of the algorithms for solving the 2-D wave eguation, it generally needs to simplify the eguation to a certain extant so as to make it suitable for the migration of different dip angles,The method introduced here is attempted to get a rather more accurate numerical solution without doing any simplification. Owing to the procedure of the solution is uns-implified, it is suitable for the migration of any dip angles and the case of laterally varied velocity.

在众多的二维波动方程求解算法中,一般都需要对方程进行一定的简化,最后得到一个适合于不同倾角偏移的方程。本文所介绍的方法,不对二维波动方程进行任何简化处理,试图得到较为精确的波动方程的数值解。由于求解过程是非简化的,原则上适用于任何倾角的偏移和具有横向速度变化的情况。 本文使用付氏变换的方法求得一个亥姆霍兹方程,并用差分法求该方程的近似解。文中给出了两个差分格式,并讨论了它们的稳定性和差分解法。此外还给出了该算法的成像法则。

 
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