By Daniel Okafor

TGS has secured rights to reprocess more than 11,000 km² of JAAN 3D seismic data across Guinea-Bissau. The multi-client agreement with Empresa Nacional de Pesquisa e Exploração, known as PetroGuin, starts processing in the fourth quarter of 2026. Final products should arrive by Q4 2027.

The parties signed in person during African Energy Week 2026 in Cape Town. TGS will execute the work with GeoPartners. The programme follows a 2019 PSDM reprocessing project the same companies undertook over the same margin. In short, this is a second pass with better tools.

What will the new imaging change?

TGS plans to apply elastic dynamic-matching full waveform inversion and Kirchhoff pre-stack depth migration, or KPSDM. The stated objective is technical, not promotional: improve imaging of clastic and carbonate targets across the Guinea-Bissau margin.

That distinction matters for anyone mapping the northwest African Atlantic margin. A 2019 PSDM effort already reprocessed this acreage once. FWI-driven workflows, now standard in frontier reprocessing, can resolve velocity fields that older tomography leaves blurred. For an area with modest drilling history, a step change in image quality can be the difference between a drillable prospect and a mapped anomaly. TGS claims exactly that step change. The drill bit will confirm or deny.

Who said what?

PetroGuin general director Alfredo Malu said: "PetroGuin highly values its long-standing partnership with TGS and reaffirms its commitment to fully honouring all obligations undertaken under this collaboration, in support of the sustainable development of Guinea-Bissau's oil and gas sector."

TGS executive vice-president David Hajovsky said: "This agreement with PetroGuin allows us to apply our latest imaging technologies to a large 3D dataset across Guinea-Bissau. This reprocessing will deliver a clear step change in image quality, helping companies better evaluate both clastic and carbonate plays across the margin."

Both statements are partnership language. The operational substance sits in the timeline and the technical scope. Takeaway: the national oil company has tied itself to a two-year data programme, and TGS has committed capital to frontier acreage on a multi-client basis.

Why does a seismic library matter here?

Multi-client reprocessing is a low-cost bet on future licensing interest. TGS licenses the finished products to exploration companies assessing prospectivity and planning work in Guinea-Bissau, according to the company. No explorer has committed to a well on the strength of this dataset. This is appraisal-stage data infrastructure, not a sanctioned project.

The scale is worth translating. At 11,000 km², the JAAN coverage is larger than Jamaica. It is roughly the footprint of a mature offshore licence round in the Gulf of Mexico, compressed into a single dataset along one margin. One dataset, one national canvas.

The commercial logic also builds on a separate track. In August this year, TGS and Geophysical Technology signed a four-year strategic collaboration for integrated seismic acquisition across shallow water, transition zone and deepwater environments. The Guinea-Bissau job slots into a broader West African and global data strategy.

What is the watch item?

Two dates govern this story. Processing begins in Q4 2026. Products land in Q4 2027, roughly 15 months later, which is a conventional cycle for FWI-plus-KPSDM reprocessing at this scale.

The number to watch after delivery is licensing uptake. Reprocessing only pays if explorers buy the images and then commit to blocks. Guinea-Bissau has no FID, no rig commitment and no announced drilling campaign attached to this news. The margin now gets modern imaging; whether it gets modern drilling is the question for 2028 and beyond.