Abstract
Summary Reflection tomography utilizes the kinematic information measured on reflection events present in seismic images in order to build better migration velocity models. The standard methodology consists of performing moveout analysis by picking the reflection events in the pre-stack migrated domain. Recent years have seen the proliferation of new methods to build more accurate and reliable image gathers for wave-equation migration by wave-field extrapolation. Several approaches exist to perform reflection tomography on these wave-equation image gathers. Our strategy relies on the adaptation of conventional moveout analysis techniques. Our method describes a mechanism for incorporating residual moveout picking in a general framework for wave-equation-based reflection tomography. The surface-offset pre-stack domain is a natural domain to perform moveout picking. We use surface-offset reverse-time migration image gathers. The application of the resulting tomography algorithm in the context of sub-salt imaging demonstrates the advantages of such methodology for addressing the challenging problem of model building in complex geological environment.
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