Westerngeco L.l.p.

Geco A.s.

Per Helgerud

Rune Toennessen

Eskild Storteig

Emmanuel Keskes

Philippe Saint-Pere

Vahid Moosavi

Helge Bragstad

A system for adjusting a deflector in a seismic survey comprises a generally upright deflector body and at least one bridle connected to a seismic cable. The bridle includes an upper segment secured to an upper connection point on the deflector body, and a lower segment coupled to a lower connection point on the deflector body. The upper bridle segment, lower bridle segment and deflector body define a geometry between themselves. This geometry is adjustable by at least one actuator so as to control the tilt angle of the deflector body.

System for depth control of a marine deflector

A method for the synchronization of systems for seismic surveys, wherein the systems are composed of subsystems and may be land-based or marine, consists in the survey system being supplied with an absolute time standard and in a time code based on the absolute time standard being generated in the survey system. There is further provided at least one programmable event generator in the survey system and this is synchronized with the absolute time standard. The time for a specific event is predetermined on the basis of given parameters and supplied with the time code which corresponds to this time. The time for a determined event is then supplied to the subsystems which are also provided with the absolute time standard. The event can thereby be executed in one or more of the subsystems on the basis of the supplied absolute time standard and a synchronization is obtained with the desired accuracy. The method can further be used for synchronizing shot times in a seismic signal generating system, and synchronizing the shot recording time and sampling times in a seismic data recording system. The method can also be used for determining the exact time of actually occurring events in a system for seismic surveys.

Method for synchronization of systems for seismic surveys, together with

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Hokksund, Norway

Per Helgerud