Shell, Kosmos target 200-MMboe Trailblazer exploration well in US Gulf for 2027

Shell is expected to drill the estimated 200-MMboe Trailblazer prospect in the first half of 2027, marking the first exploration well of its partnership with Kosmos and offering a potential tieback opportunity to the nearby Appomattox platform.

Jeremy Beckman

Related To:

Kosmos Energy

Nov. 3, 2026

2 min read

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Why this news matters:

Trailblazer could become the first exploration success for the new Shell-Kosmos partnership and add a potential 200-MMboe resource to the US Gulf portfolio.
The prospect benefits from nearby infrastructure, with any commercial discovery expected to be tied back to Shell's Appomattox platform, potentially accelerating development.
The well highlights continued deepwater exploration investment in the US Gulf despite a broader industry focus on capital discipline and infrastructure-led developments.

Map of the US Gulf of Mexico highlighting the Trailblazer exploration prospect and nearby producing hubs — The Trailblazer prospect is located near Shell's Appomattox production hub in the eastern US Gulf of Mexico, offering a potential infrastructure-led development pathway if exploration is successful.

Kosmos Energy expects Shell to drill the 200-MMboe Trailblazer prospect in the US Gulf of Mexico during the first half of 2027.

This would be the first exploration well for the partnership, formed earlier this year.

In the event of a commercial discovery, Kosmos would be the designated development operator, with Trailblazer likely tied back to Shell's nearby Appomattox platform.

Shell and Kosmos sanctioned the Trailblazer exploration well earlier this year.

Kosmos, which reported the news in its latest results statement, added that the company expects its fourth-quarter US Gulf production to be negatively impacted by planned maintenance on the Delta House platform, which hosts the Odd Job subsea tieback; and also by a workover on the Kodiak-1 well and downtime associated with Hurricane Isaias.

In July, the company completed a farm-out to its operated Tiberius project, with Navitas becoming a 33.33% partner. Occidental (33.33) is owner and operator of the host platform, the Lucius Spar.

The farm-down arrangement comprised upfront cash, carry for future development capex, and future milestone payments. The carry should cover Kosmos' share of expenditure on the project through the first half of 2027.

Elsewhere, Réseau Gazier du Sénégal recently reported that the first phase of the onshore pipeline (the "Northern Segment") to connect the offshore Greater Tortue Ahmeyim (GTA) gas hub to the 230-MW power plant is more than 25% complete.

Kosmos is a partner to operator bp in the GTA development.

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About the Author

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.