用于速度自动拾取的路径积分优化法与光顺处理技术

Auto-picking velocity by path-integral optimization and surface fairing

将用于图像处理的光顺技术引用到速度谱能量团曲面的处理环节,借以提高速度谱的分辨率,为最终获得高精确解提供一全新的途径.具体思路是基于路径积分优化法——Viterbi算法所具有的自动搜寻及获取最优解的功能,将其应用于地震资料处理中的速度自动拾取,使其向前做最大"能量团"的积分向后递归计算最优解——叠加速度,但这种解的准确性往往与所定义的目标函数——速度谱的分辨率有关.演算结果表明,Viterbi算法与关顺处理技术的有机结合,不仅提高了速度提取的精度,而且实现了速度的自动拾取,可提高常规地震资料处理的效率,从而可快捷地为叠前深度偏移提供所需初始速度模型.

In this paper, we introduce the Viterbi algorithm and apply it to auto pick the stack velocity. Here, the Viterbi algorithm makes the rule to integral the max velocity spectrum, ＂energy group＂, forward and to get the optimal solution in recursion backward. The veracity of the solution has relation to the objective function, namely, the resolution of velocity spectrum. Therefore, we introduce a method of fairing for image processing to smooth the surface of velocity spectrum, to improve the resolution of velocity spectrum, finally, to provide a new way to obtain a solution of high accuracy. The results showed that it is not only helpful to improve precision of velocity picked, but also to realize auto-picking velocity by the Viterbi algorithm combined with surface fairing. Therefore, it is not only helpful to improve the efficiency of the conventional seismic data processing, but also rapid to provide the initial velocity for pre-stack depth migration.