具有克服画弧效应的快速F-K偏移

A FAST F-K MIGRATION WITHOUT BOW-TIE EFFECT

成都地质学院

Applied Geophysical Department, Chengdu College of Geosciences

本文分析了F-K波动方程偏移存在的画弧现象及产生的原因,提出了相应的解决方法。理论推导和试验表明,正确使用振幅衰减系数和SINC插值方法,可有效地克服有限离散傅氏变换引起的周期性影响及一般插值方法引起的假同相轴,经实际资料处理,可以看出该方法的效果是非常明显的,在改善偏移质量的同时还提高了快速F-K偏移的效率。

In this paper,the bow-tie effect and the why and wherefore of its emerging in the process of F-K wave equation migration were probed and the way of solving such a problem was proposed correspondingly. It has been demonstrated by both the theory and the experiment that the correct use of the amplitude attenuation coefficient and the S1NC interpolation can effectively eliminate the periodical effects from the finite discrite Fourier transformation and eliminate the "pseudo-events" from interpolation. From the actual data processed we know that the technique recommended is practical and effectual. The final results from migration are improved not only in its quality but also in efficiency of F-K migration.