Partnership concludes work on extensive North Sea OBN dataset

A consortium of TGS, Axxis Multi-client and Viridien have completed final imaging of the OMEGA Merge dataset in the Norwegian North Sea.

This encompassed the Heimdal Terrace, Utsira and Sleipner ocean-bottom node (OBN) multi-client surveys. The total area surveyed—3,700 sq km—involved deployment of more than 250,000 nodes and 9.5 million shots, and it is said to represent the largest continuous OBN dataset on the Norwegian Continental Shelf.

To support data imaging across the boundaries of the three surveys, the data underwent pre-migration matching, designed to deliver consistency in time, phase, amplitude and frequency content.

Next, the velocity model was unified using Viridien’s time-lag full-waveform inversion and long-wavelength tomography technology, with the data pre-stack depth-migrated to produce a seamless and continuous volume over the entire OMEGA Merge area.

David Hajovsky, executive vice president (EVP) of Multi-Client at TGS, said, “With this, our customers gain significantly improved resolution and structural continuity to de-risk subsurface interpretation and accelerate prospect evaluation.”

Dechun Lin, EVP of Earth Data at Viridien, added, “The final dataset shows unparalleled imaging clarity, offering new insight into complex subsurface structures. This level of detail will support confident exploration and development decisions for years to come."