A Quadratic precision generalized nonlinear global optimization migration velocity inversion method
1. School of Communication and Information Engineering, UESTC, Chengdu 610054, China.
2. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, CDUT, Chengdu 610059, China.
Zhao Tai-Yin1, Hu Guang-Min1, He Zhen-Hua2, and Huang De-Ji2
Abstract：
An important research topic for prospecting seismology is to provide a fast accurate velocity model from pre-stack depth migration. Aiming at such a problem, we propose a quadratic precision generalized nonlinear global optimization migration velocity inversion. First we discard the assumption that there is a linear relationship between residual depth and residual velocity and propose a velocity model correction equation with quadratic precision which enables the velocity model from each iteration to approach the real model as quickly as possible. Second, we use a generalized nonlinear inversion to get the global optimal velocity perturbation model to all traces. This method can expedite the convergence speed and also can decrease the probability of falling into a local minimum during inversion. The synthetic data and Marmousi data examples show that our method has a higher precision and needs only a few iterations and consequently enhances the practicability and accuracy of migration velocity analysis (MVA) in complex areas.
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2009, Vol. 6 
