Abstract
In subsalt imaging salt bodies are usually delineated using scenario-based migration scans. Estimating the shape of salt bodies remains a challenge. Assuming that variations of velocity in salt are small, we have developed an original tomography method for estimating the shape of salt bodies. The data to invert mainly consist of residual moveout (RMO) observed below salt bodies on migrated common image point gathers (CIGs). Using ray-based nonlinear slope tomography we compute Frechet derivatives made of traveltime derivatives with respect to depth parameters describing salt bounding surface to re-position. Salt shape is progressively updated after each linearized tomographic step. We demonstrate the method on a 2D synthetic example and on a high-fold 3D land dataset from the Sultanate of Oman.
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