The Marsouin-1 was spudded on Aug. 28 in block C8, 60 km (37 mi) north of the basin-opening Tortue-1 discovery well in a water depth of roughly 2,400 m (7,874 ft).
The well is testing a four-way trap with multiple stacked targets, including lower Cenomanian, Albian, and Aptian formations.
Kosmos operates with a 60% interest, in partnership with Chevron Mauritania Exploration (30%) and Société Mauritanienne Des Hydrocarbures et de Patrimoine Minier (10%).
Earlier this month, Kosmos secured an amendment to its contract for the drillship Atwood Achiever. This reduces the operating day rate and extends the contract end date by one year.
The company retains an option to revert to the original operating day rate and end date through Oct. 1, 2016.
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