Prestack Migration Velocity Analysis: Determination of Interval Velocities , by Kamal Al-Yahya

The velocity analysis method presented in this paper uses iterative prestack migration. In each iteration, the field profiles are migrated with a velocity model and the error in the velocity model is estimated from the curvature of events in common receiver gathers. The velocity obtained from the curvature of an event is averaged over all depths above that event. The average velocities are used to estimate interval velocities which are constrained to exclude unreasonable velocity models. This sequence (migration, calculation of residual velocity, and updating the velocity model) is repeated until convergence is achieved. I processed field data using this method and obtained reasonable results after two iterations.


to SEP-51 index page

pdf(1483 KB)
ps.gz(1992 KB)