The results of drilling, wireline logs and reservoir fluid samples confirm the Tweneboa-2 well has a gross hydrocarbon column of 153 meters. The well penetrated combined net hydrocarbon-bearing pay of at least 32 meters in stacked sandstone reservoirs, which comprises a 15 meter gas-condensate-bearing zone overlying a 17 meter oil-bearing zone.

A Tweneboa field hydrocarbon column of at least 350 meters has been confirmed between the Tweneboa-1 and Tweneboa-2 wells. After logging operations have been completed, the Tweneboa-2 well will be deepened to test the exploration potential beneath the Tweneboa field. The well, which is located about six kilometers southeast of the Tweneboa-1 discovery well, will then be suspended, pending additional field appraisal.

Brian Maxted, chief operating officer of Kosmos Energy, said: “We are pleased to have commenced our 2010 drilling programme with an appraisal well that confirms our fourth hydrocarbon discovery in the Tano Basin. The Tweneboa-2 well is very significant because it validates that the Tweneboa discovery is highly prospective and confirms the field extends over a large area.”

The Tweneboa-2 well was drilled by the Atwood Hunter semi-submersible rig to an interim depth of 3,860 meters in a water depth of 1,321 meters. Following the drilling of the Tweneboa-2 well, the rig will be moved to the adjacent West Cape Three Points block where it will drill an exploration well.

Kosmos Energy holds an 18% interest in the Deepwater Tano block. An affiliate of Tullow Oil operates the block with a 49.95% interest. An affiliate of Anadarko Petroleum has an 18% interest; Sabre Oil & Gas has a 4.05% interest; and Ghana National Petroleum has a 10% carried interest.

Kosmos Energy is the operator of the West Cape Three Points block in which the company holds a 30.87% interest. An affiliate of Anadarko Petroleum has a 30.875% interest; an affiliate of Tullow Oil has a 22.89% interest; the EO Group has a 3.5% interest; Sabre Oil & Gas has a 1.854% interest, and Ghana National Petroleum has a 10% carried interest.