There’s never been a better time to explore the Norwegian Atlantic Margin.
Norway is well-positioned to assure Europe's security well into the next decade. The Norwegian Petroleum Directorate estimates that 24 billion barrels of oil equivalent are still to be discovered in their offshore territory. Energy security and higher prices are expected to encourage explorers to re-evaluate forgotten gas-prone basins such as the Møre and Vøring basins in the Norwegian Sea Atlantic Margin. Proximity to the EU market and the ability to support new infrastructure makes any discovery valuable, and the chance of making significant finds is considerable.
In some cases, exploration had previously been hampered by a lack of geological understanding in the region where where few wells have been drilled geoscientists previously did not have access to sharp, well-defined subsurface images of drilling targets nor any facts or knowledge about the intra- and sub-basalt sedimentology.
However, things have dramatically changed in this region over the last few years. TGS now offers over 59,000 km2 of regionally consistent high-quality 3D coverage in an area . This modern seismic (acquired since 2017) in these two basins. Our data indicates new sand fairways, new pre-Cretaceous highs, and 50-60 commercial-sized gas or oil leads and has opened up new under-explored plays in shallow (Miocene-Pliocene) and deeper target intervals where sill intrusions and basalt have previously been a challenge.
Crucially, TGS seismic has been unable to unveil the prospects hidden by complex basalt rock. Through exclusive seismic imaging algorithms such as dynamic matching full waveform inversion (DM FWI) and Common Offset Reverse Time Migration algorithms, subsurface velocities can be interpreted separately with extremely high confidence and in greater detail. Specific features such as terrains of rotated fault blocks can now be identified beneath the basalts. The seismic velocities below basalt are slow, indicating well-preserved sediments under various thicknesses of volcanic rock.
3D Seismic, Marine Gravity and Magnetics
TGS has led the way in exploration along the Atlantic Margin from the western Barents Sea in the north to the areas West of Shetland in the south. The Møre and Vøring basins are challenging seismic terrains that include soft sediment deformation in the overburden, shallow gas, seafloor slides, and where volcanic sill complexes intruded Cretaceous basin and sub-basalt targets within the Møre and Vøring marginal highs. Since 2017, TGS has acquired more than 59,000 km2 of high-quality 3D data to provide a new understanding of the volcanic complexes in the outer Møre Basin, the sediment-basalt interaction, and the distribution of sand systems. Several prospective targets, that previously have been covered by poor quality vintage 3D data or lacked data altogether, can now be interpreted in detail and support new exploration wells.
Subsurface visualization from the Atlantic Margin North survey showing significant amplitude anomalies at the Top Lysing level
Unique, detailed velocity models using Dynamic Matching FWI reveal intra- and sub-basalt structures.
New insight gained through the Atlantic Margin data suggests why previous drilling may have been unsuccessful
Earth Science Analytics and TGS have combined the power of machine learning and historical data with the modern Utsira OBN survey. Read the full article here.