TGS Announces 3D Seismic Onshore Survey in the Uinta Basin

OSLO, Norway (23 October 2025) - TGS, a global provider of energy data and intelligence, announces the Roosevelt 3D seismic onshore survey in the Uinta Basin. Covering 202 square miles of full fold data, this survey marks TGS' first multi-client project in the region and a significant step in advancing exploration within one of North America's prominent basins.

Kristian Johansen, CEO of TGS, commented, "The Roosevelt 3D survey is a pivotal milestone in our expansion into the Uinta Basin. Through the application of advanced subsurface imaging technologies, we are delivering high-resolution data that enhances geological modeling, identifies critical subsurface features and supports informed reservoir exploration and development decisions."

The survey targets key formations including the Green River, Wasatch and Mesaverde formations, employing an AVO & Phase Compliant processing flow, applying such techniques as Ray Based Image Correction & Optimization (RICO), Dynamic Matching diving wave and reflection FWI, and OVT PSDM & PSTM by the TGS Land processing team. Additionally, the survey covers 667 wells and includes 459 LAS logs and 2,649 rasters, providing a comprehensive dataset that supports reservoir modeling and decision-making.

With the future of exploration in mind, the survey's flexible design ensures it can adapt to the evolving needs of the industry, with plans to integrate depth imaging capabilities in subsequent phases. To support ongoing exploration efforts, receiver tails have been implemented to allow continuous data acquisition, offering long-term adaptability for future exploration and development projects in the region.

Recording for the Roosevelt 3D will begin in late Q4 2025, with final acquisition expected to conclude in fall 2026. Preliminary data will be available during 2026, and the fully processed dataset is scheduled for completion by year-end 2026.

For more information, visit TGS.com or contact:

Bård Stenberg

VP IR & Business Intelligence Mobile: +47 992 45 235 investor@tgs.com

About TGS TGS provides advanced data and intelligence to companies active in the energy sector. With leading-edge technology and solutions spanning the entire energy value chain, TGS offers a comprehensive range of insights to help clients make better decisions. Our broad range of products and advanced seismic data technologies, coupled with a global, extensive and diverse energy data library, make TGS a trusted partner in supporting the exploration and production of energy resources worldwide. For further information, please visit www.tgs.com (https://www.tgs.com/).

Forward Looking Statement All statements in this press release other than statements of historical fact are forward-looking statements, which are subject to a number of risks, uncertainties and assumptions that are difficult to predict and are based upon assumptions as to future events that may not prove accurate. These factors include volatile market conditions, investment opportunities in new and existing markets, demand for licensing of data within the energy industry, operational challenges, and reliance on a cyclical industry and principal customers. Actual results may differ materially from those expected or projected in the forward- looking statements. TGS undertakes no responsibility or obligation to update or alter forward-looking statements for any reason.