Gran Tierra Energy Inc. Announces Strategic Partnership with Ecopetrol for The Development of Fields in the Middle Magdalena Valley Adjacent to Gran Tierra’s Largest Producing Field

About this update from Gran Tierra Energy Inc.

Figure 1 CALGARY, Alberta, March 17, 2026 (GLOBE NEWSWIRE) -- Gran Tierra Energy Inc. (“Gran Tierra” or the “Company”) (NYSE American:GTE)(TSX:GTE)(LSE:GTE) is pleased to announce that it has signed a contract (collectively, “the Contract”) whereby the Company is expected to earn, subject to regulatory approvals and other conditions precedent, a 49 percent working interest (“WI”) in the Tisquirama block located in the Middle Magdalena Valley Basin of Colombia (“the Block”) which contains the Tisquirama and San Roque fields (“the Fields”). Production is expressed in barrels of oil equivalent (“boe”) per day (“boepd”). “Gran Tierra views the Contract as a strategic opportunity to obtain operatorship of assets, upon completion of the initial work program, and subject to Executive Committee approval of the corresponding plans with significant original oil in place (“OOIP”) that has historically seen limited development or secondary recovery and currently has a relatively low recovery factor. We believe this creates a compelling opportunity to apply Gran Tierra’s proven operating model and waterflood expertise to enhance recovery and extend field life. The Fields are adjacent to our Acordionero field and share similar geological characteristics, in which we have successfully implemented waterflood development to maximize recovery. By leveraging the technical expertise and operational efficiencies demonstrated at Acordionero, we believe there is a clear opportunity to waterflood the assets and significantly improve the recovery factor. In addition, we see potential to apply modern technologies, including potential application of horizontal and multi-lateral drilling techniques utilized in our Canadian operations, to increase reservoir contact and improve recovery. The proximity of these assets to our existing operations would also create meaningful synergies, including the ability to integrate water management across the fields and to utilize natural gas to implement a gas to power project, thereby lowering operating costs across the area. Operating these Fields alongside Acordionero would allow Gran Tierra to manage the area as a single operating hub, improving efficiency and maximizing long-term value for all stakeholders. The transaction further strengthens the longstanding partnership between Ecopetrol and Gran Tierra” said Gary Guidry, President and Chief ...

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