波场延拓法VSP正演模拟

波场延拓法模拟VSP,可以根据具体情况的需要同时对上、下行波场进行模拟,也可以只模拟上行波场或下行波场。对多次波能够有效地控制,通常在只关注一次波的情况下,可以不对多次波进行模拟。该方法相对其他波动方程正演模拟方法,有更高的计算效率。采用分步Fourier法延拓波场,既保证了延拓过程的稳定性,又不失较为复杂模型的模拟精度。模型试验表明,该方法能够有效地对VSP波场进行模拟,模拟的结果正确、可靠。

VSP FORWARD MODELING WITH THE WAVE FIELD EXTRAPOLATION METHOD

In VSP forward modeling with the wave field extrapolation method,we can just simulate upward wave or simulate upward wave and downward wave simultaneously according to the situation,and the multiple wave can be controlled efficiently.In general,under the condition of being only concerned with the primary reflection,we needn't simulate the multiple wave.This method has high efficiency compared with other wave equation modeling methods.In this paper,the split-step Fourier method was used to extrapolate the wave field,which can guarantee the stability of wave extrapolation and the modeling accuracy for the complex model.Model test shows that this method can simulate VSP efficiently and the modeling result is correct and reliable.