Sub-Salt Velocity Model Update Using Wave-Equation Migration Perturbation Scans

C024 Sub-salt Velocity Model Update using Wave- Equation Migration Perturbation Scans Abstract 1 We have developed a new practical sub-salt velocity model update procedure using wave equation based perturbation scans which aims to improve sub-salt depth imaging results. In our approach we have borrowed ideas from traditional time processing for picking velocity perturbation in the migrated stack domain which have been used for years in areas of poor signal to noise where image gather analysis is impossible or unreliable. In contrast to the time domain processing we perform our picking in a pseudo depth domain with the benefit of lateral