Год издания: 2013

The specific goal of this work is to present a complete velocity map obtained by an automatic method of velocity picking in the Semblance domain as a sequencial nonlinear optimization problem. The steps of the conventional velocity analysis for each commom-mid-point section in defined in the following way: first, normal-moveout stacking velocities are estimated by means of Semblance function S, with the sums along hyperbolic time trajectories producing a map of S(vrms,t0); second, manual picking is performed on the Semblance map for specific stacking time t0; third, interval velocities, vint, are calculated based on the picked smooth velocities, vrms, to construct earth velocity time models. The present work is multi-task as: (1) to diminish the picking step by considering that stacking velocities are based on an interval velocity model; (2) to search for an interval velocity model that best explains the estimated stacking velocities; and (3) the search is automatic, but subject to geological, physical and mathematical constraints, and editing.