I can't remember who we used, but Shell Aviation will be able to tell you. It was on the Valle Morado / Rio Colorado seismic work in about 2000 and the operations were very similar to yours. The seismic manager was Jean Luis Teurlai (contact him here
Accueil > Prsentation du consultant ). Also Pan American Energy (PAE) did similar seismic stuff with some chopper support, based further north out of Tartagal rather than where we were based in the Oran area. Absolutely gorgeous area.