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Since 1987, 3D seismics have been the main tool used by ELF AQUITAINE for exploration as well as for field development in the Pyrenees foothills (Aquitaine basin of South France) . The geological context made of very tectonized structures and the . rather poor signal/noise ratio at target depth (4500 m to 5500 m) have led to develop specific design tools for these 3D surveys .