North Sea OBN survey addressing complexities of NOAKA area

Aug. 2, 2021
TGS expects acquisition to start soon of a 437-sq km ocean bottom node seismic survey in the North of Alvheim and Krafla-Askja area of the Norwegian North Sea.

Offshore staff

OSLO, Norway – TGS expects acquisition to start soon of a 437-sq km (169-sq mi) ocean bottom node (OBN) seismic survey in the North of Alvheim and Krafla-Askja (NOAKA) area of the Norwegian North Sea.

This will cover the region between the Oseberg and Alvheim fields, and includes both held and open acreage and the NOAKA project, combining various fields operated by Aker BP and Equinor, with recoverable reserves of more than 500 MMboe.

TGS will apply learnings from the recent TGS-AGS Utsira project in the North Sea, said to be the first large-scale, densely-sampled OBN survey for exploration.

The company will draw on results from the current reprocessing of Utsira, including the extraction and use of ultra-long offset signal for FWI-based model building.

And as with Utsira, the NOAKA survey will employ full azimuth and ultra-long offsets to improve understanding of the region’s complex geology.

It will also use multi-component processing, designed to help deliver stable low frequencies, high signal-to-noise ratios, reliable AVO and the capability to distinguish between structure and attribute anomalies.

Final processing products should be delivered next summer.

08/02/2021

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