TGS started a project of 3D seismic reprocessing which will cover approximately 514 square kilometers over Petronas Megah discovery, located in the SB-3K block off the coast of Sabah, Malaysia. Final products are expected by April 2027.
Processing began in July 2026 and will utilize advanced seismic imaging technologies to obtain a more precise definition of the subsurface. The work will be applied to previously acquired multi-client data in this offshore area.
TGS will apply FWI technology to Megah data
Specifically, TGS it will use elastic multiparametric full waveform inversion (FWI) and depth imaging technologies on the multi-client 3D seismic dataset Geostreamer Sabah Phase 2, originally acquired in 2017.
The processing flow will also incorporate a high-resolution velocity model and diffraction imaging across the entire area associated with the Megah discovery.
These tools allow for the extraction of greater detail from existing seismic data and the construction of a more accurate representation of subsurface structures. Reprocessing thus aims to provide new elements for geological interpretation and prospect evaluation.
Reprocessing seeks to reduce subsurface uncertainty
Petronas Megah was discovered in 2025, based on that finding, the new processing of seismic data seeks to offer a more detailed view of the area and improve the understanding of its geological configuration.
The results will also support future planning delimitation wells, used to obtain more information about the extent, geometry and characteristics of a discovery.
In this way, the project connects the advanced seismic image with the next phases of evaluation of the SB-3K block and with the technical decisions that may be adopted around Megah.
The results will be available in April 2027
According to David Hajovsky, executive vice president of TGS Multiclient division, the Megah discovery reinforced the exploration potential of the area and the use of advanced reprocessing techniques can help reduce the uncertainty associated with the subsurface.
The company expects to complete the final products in April 2027, until then, the processing will combine elastic multiparametric FWI, depth imaging, a high-resolution velocity model, and diffraction imaging over the approximately 514 square kilometers included in the project.
Once available, these products will provide a more detailed geophysical basis for interpreting the discovery, identifying structures of interest, and more precisely defining future delineation campaigns. Their value will lie in transforming seismic data acquired years ago in updated information to support new exploration and evaluation decisions in Sabah waters.
Source: OE OFFSHORE ENGINEER
Photo: Shutterstock
