Gabon's Ministry of Oil and Gas has disclosed that the Grand N'gongui field in the Gamba area of Ogooué-Maritime province holds an estimated 350 million barrels, while the nearby Maroga field carries an estimated potential of 24 million barrels. Grand N'gongui came on stream in April 2026, marking a significant new phase for national production and confirming the continued prospectivity of the Gabonese basin.
Both fields are located in the Gamba area of western Ogooué-Maritime, a province with an established history of oil production. The Gabonese government framed the dual-field development as a revitalisation of the sector, with exploitation of Grand N'gongui expected to contribute meaningfully to an increase in national output. The Maroga field, while considerably smaller at 24 million barrels estimated potential, adds incremental resource depth to the same producing area.
The Gamba region has historically hosted mature producing assets, and the commencement of Grand N'gongui production in April 2026 signals that the Gabonese basin retains the ability to deliver material new volumes. A combined resource base of approximately 374 million barrels across both fields, if recovery projections are realised, would represent a substantial contribution to Gabon's production profile at a time when the country is seeking to sustain and grow its hydrocarbon revenues. The article does not specify operators, block designations, water depths, or contract arrangements associated with either field.
For Norwegian service companies, the development stage of Grand N'gongui — having just come on stream in April 2026 — suggests that upstream infrastructure, well services, and production support requirements are either actively being procured or will enter procurement cycles in the near term. The scale of the Grand N'gongui resource, at 350 million barrels, is large enough to justify sophisticated subsurface and surface production technology. Partners should monitor operator disclosures and Gabonese government announcements closely to identify when formal procurement processes open, and use this period to build relationships with the relevant concession holders and the Ministry of Oil and Gas.