Offshore staff
OSLO, Norway — TGS has completed imaging over a priority 198-sq-km area of its NOAKA ocean-bottom node (OBN) seismic survey in the Norwegian North Sea.
The company applied proprietary OBN processing and imaging techniques, including dynamic matching full-waveform inversion (DM/FWI), to enhance resolution and structural definition of the region’s complex geology and reservoirs.
The NOAKA survey, acquired over two seasons in 2021-22, comprised 434 sq km of multiclient OBN data over an area between the Oseberg and Alvheim field centers that has undergone concerted infrastructure-led exploration in recent years.
Processing employed full azimuth and ultra-long offsets, which in turn allowed construction of a detailed velocity model, using DM-FWI technology. Imaging also benefited from the enhanced low frequencies provided by OBN data, TGS said, allowing clear and accurate depth images to be generated.
Multi-component processing enabled separate processing and imaging of up and down-going wavefields, with the downgoing wavefields providing complimentary detailed near-surface imaging.
Imaging with FWI, the company added, delivers improved imaging of deep faulting and structures below the Base Cretaceous Unconformity, which is critical to understanding the Jurassic and Triassic prospectivity.
12.15.2023
