快速变步长相移插值法地震正演模拟

相移插值法偏移有其相对应的正演算法，便在正演过程中外推用的相移因子与偏移过程中的形式不同，且不需要重新标定。通过采用一种新的变延拓步长方法，使得在微机上实现的相移插值法正演模拟有较高的执行效率。它适合于任意复杂地质构造的模拟，对地层无倾角限制，算法稳定性好，且无 频散现象。文中给出的模型计算结果表明，此法计算速度快、精度高适合复杂地质构造，是一种衫用的波动方程正演模拟算法。

Seismic forward modeling by fast variable step phase-shift interpolation.

There is a relevant forward modeling algorithm for phase-shift interpolation migration; however, the phase-shift factor for extrapolation in forward modeling is different from that in migration, and needs no recalibration. The use of a new variable continuation step method allows personal computer to fast perform seismic forward modeling using phase-shift interpolation. This method suits the modeling for any complicated geological structures and is not restricted in formation dip, there being stable algorithm and no frequency dispersion. It is theoretically shown that this is a practical method for wave equation forward modeling because of its fast accurate operation and suitableness to complicated geological structure.