A wave-equation migration velocity analysis approach based on the finite-frequency sensitivity kernel

Abstract

Based on the finite-frequency sensitivity theory, we present a migration velocity analysis method. The finite-frequency sensitivity kernel is used to link the observed residual moveout and the velocity perturbations in the migration velocity model. The new approach is a wave-equation based method which naturally incorporates the wave phenomena and is best teamed with the wave-equation based migration for velocity analysis. This paper is targeted to solve some important issues in using this approach in velocity updating process, e.g., the calculation and storage of huge amount of sensitivity kernels, the partition and interpolation of velocity model and the iteration process. Numerical examples are used to demonstrate the updating process.