Abstract

Classical stacking velocity determination consists of applying NMO corrections, with a number of constant velocities, to the traces of a CDP gather; computing coherent energy for the NMO-corrected traces; and mapping the coherency obtained as a function of traveltime and velocity in a form suitable for interpretation.Migration Velocity Determination may be performed by generating migrated traces with a number of constant velocities; computing coherency of the energy migrating into identical positions of the migrated traces; and mapping the coherency as a function of (in this case) vertical traveltime and velocity in a form suitable for interpretation.A typical result of Migration Velocity Determination is a contoured display of coherency as a function of time and velocity.Because of the migration process, the velocities obtained are velocities to points situated along a vertical column of the subsurface and are suited to provide an optimum migrated section (migration before stack).

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