. Mannousi data gave us the opportunity to check and control some new processes for the prospection of geologically complex areas.We used classical and new software tools for the processing, such as Polystack™, migration by ares of circles (MIC), post-stack and pre-stack depth-migration (MIGACOR) thus building a methodology to obtain the best possible image of the original model.One of the key steps in our processing was the zero-phase souree deconvolution which appeared necessary when comparing the first results from MIC with the two we11s(1504 and 9004). After this special processing it was possible to tie the depthmigration to the we11s.The main method for changing the macromodel to get closer to the original was the comparaison between pre-and post-stack depth migrations.Careful examination of the Iso-X gathers also gave precious information about the local modlfications to be made to the velocities.The result is fairly close to this original, more in the upper part of the section than in the 10-wer centra! part, with some good indication of the eroded anti cline structure located in the middle of the lowest part of the profile.Marmousi data and geological surroundings are described in "Bourgeois et al (this volume)".To fmd the original model from these data, we used the fo11owing method :1 -seismic and we11data processing 2 -initial model determination 3 -model control and enhancement, The key point of the seismie data processing was the zero-phase souree deconvolution which made it possible to tie depth-migrated seismie data from the Polystack™
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