INTRODUCTION
In exploration foothill zones, rugged surface cause damage in seismic data quality. Statics corrections have been the conventional technique proposed to overcome this problem. In another approach, Berryhill presented the concept of wave field continuation, named Wave Equation Datuming (WED) based in an extrapolation scheme using the Kirchhoff Integral, applying it to poststack (1979) and prestack data (1984). Other solutions emerged based on finite difference (Claerbout, 1985) and phase-shift (Gazdag, 1978). Reshef (1991) gave a datuming principle that permits direct prestack migration of data recorded on a not flat topographic surface. Yilmaz and Lucas (1986) replaced a layer of arbitrary shape and known velocity with another one with different velocity in order to eliminate bending trajectories in the area with severe velocity contrast.