Kosmos Energy has made a significant gas discovery at its Tortue-1 development well in Block C-8, offshore Mauritania.

The well was drilled to test the Tortue West prospect, which forms part of the Greater Tortue complex.

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It was drilled to a 4,630m depth, where it encountered 107m of net hydrocarbon pay and a single gas pool in the primary Lower Cenomanian objective.

Kosmos Energy chairman and chief executive officer Andrew Inglis said: "Volumetrically, the Tortue-1 well has far exceeded our pre-drill expectations and has discovered a large scale gas resource.

"Volumetrically, the Tortue-1 well has far exceeded our pre-drill expectations and has discovered a large scale gas resource."

"Our seismic imaging indicates the areal extent of Tortue West could cover approximately 90km², that will be better defined with appraisal drilling.

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"Importantly, given the results and excellent well-to-seismic calibration, the Tortue-1 well has significantly de-risked our large and under-explored 27,000km² deepwater position in Mauritania."

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The company is planning to undertake an appraisal programme to delineate the Tortue West discovery.

The Marsouin-1 exploration well, located in the central part of Block C-8, is expected to be drilled in the third quarter of 2015.

An exploration programme is also being formulated to test other prospects in the Greater Tortue Complex, extending into the St. Louis Offshore Profond Block in Senegal, including the Tortue East and Tortue North prospects.

A 3D seismic survey acquired over Kosmos Energy’s Senegal blocks in 2014 is being processed and interpreted to support the programme.

Kosmos owns a 90% stake in the Tortue Prospect, with the remaining 10% held by Société Mauritanienne Des Hydrocarbures et de Patrimoine Minier.