Stacking and Migration results:
Fig. \ref{228782} shows the stacked (left) and the migrated data (right). Notice that the image present almost flat reflectors at the beginning of the stack, then there is a structural high with steep reflectors, to the right side of this peak there are as well high dipping structures . Fig. \ref{765061} zooms into the structural high. Notice that the image is severely under-migrated (remaining hyperbolas).  We also highlight the crossing reflectors at the flanks of the peak which are not geological meaningful. There are also artifacts to the right of the peak, where there is a high dipping reflector, in which the high dip reflector does not connect with the flat surface.
To overcome the under-migration we tried to improve the velocity picking. Specially on the area of  high dipping structures, there is a double coherence in the semblance analysis and we tried to re-pick  on the coherence with the highest velocities  before migration. We present this processing and results in the next part of the report. We also tried Dipmoveout correction to improve these results. To improve the issue of crossing reflectors we re-picked velocities on the problematic CMP gathers trying to improve the flattening of  the reflection that have the NMO increasing with increasing offset and disregarding the moveouts in other directions. The goal in this case is to stack constructively the reflections coming from below the seismic line and by default stack destructively the backscattering coming from the surrounding structures.