基于波场计算的最优化速度反演

Optimization velocity inversion based on seismic wavefield computation

成都理工学院, 成都610059

Chengdu Institute of Technology, Chengdu City, Internal Postcode 610059

本文提出了一种适用于声学近似的地震反演方法, 这种方法是基于混合法波场计算和最优化方法而建立的一种迭代速度反演。在波场计算中, 采用了非均匀离散网格的混合算法使反演的计算速度有所提高。通过对长波长速度信息的恢复和合理使用最优化方法, 加快了迭代反演的收敛。文中给出了这种反演方法用于地震反射资料的理论计算实例, 表明方法是有效的, 同时也说明了初始模型、噪音和信噪比对选代反演结果的影响。

This paper proposes a seismic invcrsion method applicable for acoustic appoximation. The method is something of iterative velocity inversion established on hybrid wavefield computation and optimization theory. In its implementation, the inversion computation is sped by making use of hybrid algorithm with non-uniform discrete grids, and the recovery of velocity information for long wavelengths and the application of optimization technique givc rise to high specd convergence for the iterative inversion. Examples on theoretical computation for seismic reflection data are given in the paper, which show the effectiveness of tho method and the cffects of initia1 models and noises on inversion results.