TGS reprocessing 3D seismic data over Megah discovery offshore Malaysia

The project applies advanced imaging technologies to a seismic dataset covering Petronas' 2025 Megah discovery, with the aim of reducing subsurface uncertainty and supporting future appraisal activity.
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Oct. 5, 2026
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Why this news matters:

  • Advanced reprocessing could improve understanding of the recently announced Megah discovery and surrounding prospectivity.

  • Improved subsurface imaging may help de-risk future appraisal drilling and field development decisions.

  • The project highlights continued exploration and evaluation activity offshore Malaysia.

Courtesy TGS
Color-enhanced seismic section showing complex subsurface geological structures interpreted from offshore seismic data

Advanced seismic imaging techniques are being applied to reprocess data covering the Megah discovery area offshore Sabah, Malaysia. TGS expects the project to improve subsurface imaging and support future appraisal and exploration planning.

Project at a glance:

  • Operator: TGS
  • Location: Offshore Sabah, Malaysia
  • Area: 514 sq km
  • Dataset: Geostreamer Sabah 3D Phase 2
  • Discovery: Petronas' Megah discovery (2025)
  • Scope: 3D PSDM multi-parameter FWI reprocessing
  • Expected completion: April 2027

TGS is conducting a 3D pre-stack depth migration (PSDM) multi-parameter-FWI reprocessing project over a 514-sq-km area offshore Sabah, Malaysia, that includes Petronas’ 2025 Megah discovery.

The company is applying its Elastic Multi-Parameter Full Waveform Inversion and depth imaging technologies to reprocess its own Geostreamer Sabah 3D Phase 2 dataset, acquired in 2017.

TGS aims to improve the data through use of a high-resolution velocity model and diffraction imaging across the Megah Field. 

Processing started in July; final products should be issued in April 2027.

"The Megah discovery has reinforced the exploration potential of this area, and advanced reprocessing can play an important role in reducing subsurface uncertainty," said EVP Multi-Client David Hajovsky.

Specifically, TGS expects the results to strengthen geological interpretation, prospect evaluation and future appraisal well planning.

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About the Author

Jeremy Beckman
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Jeremy Beckman

Staff Writer / Editor, Europe

Jeremy Beckman has been Editor Europe, Offshore since 1992. Prior to joining Offshore he was a freelance journalist for eight years, working for a variety of electronics, computing and scientific journals in the UK. He regularly writes news columns on trends and events both in the NW Europe offshore region and globally. He also writes features on developments and technology in exploration and production.

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