南极和北极地区在全球变化中的作用研究

多次波问题是海洋地震勘探中最突出的问题之一 ,如何有效地压制多次波是解决问题的关键。多次波数据处理的压制方法和技术分为运动学的滤波方法和动力学的波动方程方法两大类。波动方程方法由于几乎不需要先验信息和具有较好的压制效果 ,已经成为多次波压制方法和技术发展的主要趋势。文章首先对波动方程方法进行了较全面的综述 ;然后 ,对波动方程方法中的反馈迭代反演方法做了深入的讨论 ;最后 ,通过理论模型的正反演计算 ,验证了运用波动方程反馈迭代反演法不需要知道震源函数、地下岩层结构和岩性等先验信息。此方法适用于压制多种类型的多次波 ,具有优异的振幅保真性等独特的优点。

MULTIPLE ATTENUATION TECHNIQUES BASED ON WAVE EQUATION

Multiple attenuation is a critical task for seismic data processing, especially for marine data. Methods that attenuate multiple can be classified into two broad categories: (1)those that seek to exploit a feature or property that differentiates primary from multiple and (2)those that predict and then subtract multiples from seismic data. The former are typically filtering methods and the latter are generally based on the prediction from either modeling or inversion based on wave equation. The algorithm based on the feedback model is being discussed in detail because it has a lot of advantages: superior amplitude preservation, complete velocity independent, no model required, no source wavelet required, limited user interaction, etc. Results on the simulated data show the robustness of our algorithm.