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When data needs to be acquired quickly, due to environmental or seasonal constraints, or to meet business deadlines, SynAcq synchronized acquisition may enable a 100% increase in productivity. SynAcq uses two independent vessels with active seismic interference management and mitigation, to enable deadlines and commitments to be met and give asset teams more time to evaluate the data.
The deeper the water and the softer the seabed the closer two vessels can operate. If the shotpoint intervals between the two vessels differ by more than around 250ms, the vessels could get very close.
With synchronized acquisition controlled by SeaProNav 4 CGG can acquire data with only SI that CGG processing can attenuate, to provide data in roughly 50% time without compromising quality.
In deeper water SI dissipates faster. In shallow water with identical shotpoint intervals SI can be problematic even 100km away. In the North Sea, using a standard 4000cu inch source the rule of thumb separation is 25km.
Ideally we need to avoid SI that is both broadside and arrives at the same time from shot to shot, however new subsurface imaging techniques enable even shot-to-shot coherent broadside noise to be attenuated. Depending on the survey size, among other things, this can be achieved by:
When both vessels are shooting, their shotpoint intervals should differ by ~250ms from shot to shot, which may require a slowdown of 5% for one vessel.
By using these techniques and an independent third party to coordinate acquisition contractors, it has been possible to avoid timesharing in the Norwegian Sea for the last two acquisition seasons
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