Utsira Ocean Bottom Node

TGS changing ILX in the North Sea

Utsira OBN

The Utsira OBN survey in the South Viking Graben was acquired in 2018 and 2019 in collaboration with AGS. The survey offers dense sampling and superb imaging quality with use of full azimuth and ultra-long offsets. To extract further value from the Utsira OBN dataset, TGS have ongoing reprocessing using Dynamic Matching FWI (DM FWI). OBN surveys naturally measure ultra-long offsets that is extracted from the data with deblending technology.

The first example of Artificial Intelligence (AI) geological interpretation on a large-scale, densely sampled OBN exploration dataset, is also available. This entirely new suite of derivative seismic products provides enhanced exploration insights through AI, especially in areas where Infrastructure Lead Exploration (ILX) is drawing increased focus from the E&P industry. Read more about our Utsira AI Products.

Meeting complex geological challenges

OBN is the ultimate imaging tool to help operators overcome complex geological imaging challenges. With full azimuth acquisition, complex geology can be illuminated in all directions, and structures and attribute variations can be properly understood. Greater than ten times higher fold significantly improves the signal-to-noise ratio, as well as the ability to distinguish between structure and attribute anomalies which the interpreter can believe in or not. Other advantages include ultra-long offsets, measurement of the full wavefield and measurement of both P- and S-waves for better characterization of fluids in a reservoir.

Cost Reduction

Despite the reduction in cost of alternative seismic acquisition, OBN has prevailed and grown its presence in the proprietary acquisition domain during the last few years. This is because the recent closing of the price differential between streamers and OBN is opening up large multi-client OBN investment opportunities in areas with complex geology, a conglomerate of license holders, and acreage turnover.

TGS is positioning itself to take a lead on multi-client OBN adaption and grow this market over the next decade. OBN is defining a new baseline for quality subsurface imaging using full azimuth, ultra-long offsets, small bin size, and exponentially more measurements per area.

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