Seabed observations in obstructed areas


The GNS™ autonomous Self-Pop-up Nodes (SPNs) is a natural solution for offshore seismic acquisition in the areas obstructed for surface streamers.

The obstacles preventing seismic streamer vessels from acquiring data safely and efficiently can be a result of field development activities (production and drilling infrastructure, floating production, storage and off-loading vessels etc.) or natural obstacles (rough sea bottom topography, islands, reefs, middle ground, changeable passes and strong unpredictable currents, etc.). These obstructions can make streamers operations impossible or unsafe creating challenges to acquire full-fold seismic coverage without gaps.

In such areas the GNS™ SPNs can be deployed near and under the obstacles to infill a gap between existing 3D survey data coverage, increasing fold and reducing risks to lose or damage outboard equipment.

Another benefit of GNS™ SPN acquisition is multicomponent data recorded by a three component geophone in addition to a hydrophone for each seismic receiver location. Also the acquired data has better signal-to –noise ration due to quiet sea bottom environment far from the noise induced by towed streamers and surface wave conditions. Our instruments provide opportunity to acquire full azimuth data, resulting in better illumination and continuity of reflectors.

VSP and logging data combined with nearby sea-bottom three-component data provide better calibration of surface seismic data and more reliable interpretation of the whole data volume. Also, the combined hydrophone and the vertical geophone data allows to divide downgoing and upgoing waves and to suppress receiver-side multiples. The GNS™ SPNs provides the excellent QC of streamer data processing in overlapping areas, as well as quality-check of de-multiple and other processing steps results.