The Atwood Achiever drillship drilled the Marsouin-1 exploration well in about 2,400 m (7,874 ft) of water. Based on preliminary analysis of drilling and wireline logging results, Marsouin-1 encountered at least 70 m (230 ft) of net gas pay in Upper and Lower Cenomanian intervals comprised of excellent quality reservoir sands.
The Marsouin-1 gas discovery is about 60 km (38 mi) north of the basin-opening Tortue-1 gas discovery (renamed Ahmeyim).
Kosmos Energy Chairman and CEO Andrew G. Inglis said: “Marsouin-1 is our second major discovery of 2015, extending our 100% success rate in the outboard Cretaceous petroleum system offshore Mauritania and Senegal. Well-to-seismic calibration has significantly de-risked the discovered resource base, as well as future prospects in the basin.
“Importantly, the well results have validated our charge model and given us growing confidence in our ability to predict the oil and gas potential of this emerging, large-scale petroleum system. We have a disciplined exploration and appraisal program planned to further unlock the basin.”
Atwood Achiever will now proceed to the Ahmeyim-2 location in the southern part of Mauritania’s block C-8 where it will drill the top-hole section of the well. The drillship is then expected to sail to Senegal where it will spud Guembeul-1, the first in a series of wells to delineate the Greater Tortue area, before year-end.
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