Abstract：To derive correct medium velocity from prestack seismic data is very significant to complicated structure imaging. The complexity solution of the above problem needs a good optimization method. A new successive overall optimization calculation method will be used in the solution and non-linear velocity inversion calculation. The method is different from random methods (such as analog annealing，genetic algorithm and average field annealing)，and it applies a dynamic equation to control optimizing computation process. The dynamic equation uses gradient information to make the solution fast approximate the minimum point. The 2nd term of the dynamic equation may make the solution escape local extreme value and cause the overall optimization capacity when the solution approximates the minimum point;the application of gradient information has made the solution efficiency improved ob}riously. There will be no need to pick large amount of reflection travel times in calculation of objective function by the velocity estimation method based on optimization algorithm. What is needed is only to derive zero-offset travel-times from stack section to establish optimization objective function with the use of similitude criterion. Background velocity estimation will be automatically completed by the method. The example in this paper proves that its computing efficiency is much better than that of random method. Correct result has been obtained in velocity estimatron.
于建华, 方正茂, 李幼铭, 杨长春, 刘洪. 一种用于背景速度估计的新全局优化算法[J]. 石油地球物理勘探, 1998, 33(5): 573-582.
Yu Jianhua, Fang Zhengmao, Li Youming, Yang Changchun, Liu Hong Yu Jianhua. A new overall optimization algorithm used in background velocity estimation. OGP, 1998, 33(5): 573-582.
