TGS has launched two multi-client seismic projects offshore Indonesia and Malaysia as well as a mega survey off the coast of Mauritania and reprocessing projects in Liberia and Sierra Leone.
TGS has launched two multi-client seismic projects offshore Indonesia and Malaysia as well as a mega survey off the coast of Mauritania and reprocessing projects in Liberia and Sierra Leone.
In South East Asia, the Natuna 2D-cubed and Sarawak 2D-cubed surveys provide a basin-scale dataset that spans more than 327,000 km² across the Greater Natuna and Sarawak basins.
Natuna 2D-cubed brings decades of seismic data together to create a comprehensive subsurface view of the Greater Natuna Basin. The project applies TGS’ structurally conformable interpolation technology, 2D-cubed, to transform nearly 150,000-line km of 2D seismic data and 2400 km² of 3D coverage into a regional-scale 3D volume covering over 160,000 km².
Sarawak 2D-cubed spans the entire offshore Sarawak Basin, delivering more than 167,000 km² of seismic coverage across multiple proven hydrocarbon provinces.
‘The Natuna 2D-cubed and Sarawak 2D-cubed datasets establish TGS’ largest multi-client 2D-cubed presence in Southeast Asia to date,’ said TGS. ‘This extensive coverage supports the broader vision of a continuous seismic corridor across this hydrocarbon prolific region, linking the Malay, Penyu, Natuna, Sarawak, and Sabah basins.’
Meanwhile, TGS has launched a large-scale multi-client 3D seismic project designed to support exploration across offshore Mauritania and the wider West African Atlantic Margin.
The Mauritania MegaSurvey comprises more than 100,000 contiguous km2 of seismic data to generate one seamless volume across the offshore of Mauritania, allowing regional interpretation of the full source to sink from nearshore to ultradeep.
Finally, TGS has started reprocessing the Liberia Sunfish 3D (Vision) seismic survey in the Harper Basin, offshore Liberia.
The survey covers approx. 6100 km2 and was originally acquired by TGS in 2013. It will deliver a full 3D Kirchhoff Pre-Stack Depth Migration from field tapes, applying modern imaging workflows to enhance data quality and subsurface understanding. Final products are scheduled for release in the third quarter of 2026.
The reprocessed dataset is designed to deliver clearer imaging of Upper Cretaceous plays, with a strong focus on preserving the fidelity of AVO response throughout the data. This enables exploration teams to apply advanced reservoir characterisation workflows with greater confidence.
Upon completion, TGS will have reprocessed all available 2D and 3D seismic data offshore Liberia, comprising of more than 50,000 km of 2D seismic and more than 31,000 km2 of 3D seismic through advanced modern pre-stack depth migration workflows.
Also in West Africa, TGS has also completed the Sierra Leone Fusion 3D (Vision) multi-client reprocessing project.
The project consists of a full reprocessing from field tapes of a 7476 km2 area through a comprehensive Pre-Stack Depth Migration sequence, utilising advanced ML-based denoise and deghosting, adaptive demultiple and advanced depth imaging workflows, including DM-FWI to deliver clearer imaging of Upper Cretaceous plays.
The project merges multiple surveys, acquired by TGS between 2008 and 2014, preserving the fidelity of AVO throughout the data, allowing companies to perform advanced reservoir characterisation workflows and assess AVO-plays with increased confidence, said TGS.
‘Sierra Leone sits within a proven yet underexplored segment of the West African Atlantic Margin, where access to consistent, high-quality seismic data is critical for informed exploration decisions,’ said David Hajovsky, executive vice president, multi-client at TGS. ‘The Fusion 3D project strengthens the regional subsurface framework, enabling companies to place individual prospects into a broader geological context and evaluate opportunity with greater confidence as interest in the basin continues to build.’
