Method for seismic acquisition on the seabed, guiding...

G - Physics – 01 – V

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G01V 1/38 (2006.01)

Patent

CA 2605157

The invention relates to a method for acquiring seismic data at a plurality of positions spread out over a zone on the seabed. The method according to the invention comprises the following steps : - transmitting acoustic waves in the water layer above said zone by means of a plurality of sources, - for each of said acquisition positions, dropping from the surface a seismic acquisition equipment, said equipment comprising a seismic acquisition unit and autonomous guiding equipment adapted to receive whilst descending acoustic signals from said sources and to control its trajectory according to the received acoustic signals so as to direct said equipment towards said position, - performing the seismic acquisition, - causing the acquisition equipments to move up to the surface, - retrieving the acquisition equipments on the surface.

Cette invention porte sur un procédé permettant d'acquérir des données sismiques au niveau d'une pluralité de positions réparties sur une zone sur le fond marin. Le procédé de cette invention comprend les étapes suivantes consistant: à émettre des ondes acoustiques dans la couche d'eau située au-dessus de ladite zone au moyen d'une pluralité de sources; à larguer depuis la surface, pour chacune des positions d'acquisition, un équipement d'acquisition sismique qui comprend une unité d'acquisition sismique et un équipement de guidage autonome pouvant recevoir, pendant la descente, des signaux acoustiques desdites sources et contrôler la trajectoire dudit équipement d'acquisition sismique en fonction des signaux acoustiques reçus de façon à le diriger en direction de cette position; à réaliser l'acquisition sismique; à pousser les équipements d'acquisition à remonter à la surface; et à récupérer les équipements d'acquisition à la surface.

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