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当水平座标或座标系被它们的傅氏共轭代替时,一般说波动方程偏移迭加是比较简单的。本文利用这个概念讨论了二种实用的偏移方案。一种方案扩展了克莱波特有限差分法,大大缩小了通常在倾角较大和频率较高时与这个方法有关的波散问题。第二种方法牵涉到时空域的傅里叶变换,在共轭空间利用全标量波动方程可以彻底消除(直到假频的)波散。第二种方法对三维偏移和迭加前偏移显得特别适用。
When the horizontal coordinates or coordinate systems are replaced by their Fourier conjugates, it is generally simpler to add the wave equation offset. This article uses this concept to discuss two practical offset schemes. One approach extends the Kleoplot finite difference method, which greatly reduces the wave dispersion problems associated with this method, usually at higher dip angles and at higher frequencies. The second method involves the Fourier transform of the space-time domain, and the use of the full-scale wave equation in the conjugate space can completely eliminate (up to aliasing) the dispersion. The second method is particularly suitable for 3D offsets and pre-stack offsets.