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Wave-equation migration velocity analysis by residual moveout fitting

Biondo Biondi

Biondo Biondi


Flatness in migrated angle-domain common image gathers is an effective criterion for measuring migration-velocity accuracy. An objective function that measures the power of the stack as a function of residual-moveout parameters directly, and indirectly as a function of migration velocity, can be robustly maximized by using a gradient-based method. This paper presents a method to compute the gradient of this objective function by wave-equation operators. The proposed algorithm has the additional advantage of not requiring the picking of the residual-moveout parameters.