TULLOW OIL HAS discovered a highly-pressured light hydrocarbon accumulation at the Tweneboa-1 exploration well in its Deepwater Tano license in 1,148 m of water offshore Ghana. The well, drilled to a depth of 3,593 m, encountered 21 m of net pay. The well is now being deepened to further assess the discovery and the up-dip limit of a potential deepwater fan system.

The Tweneboa-1 well was drilled by Ocean Rig deepwater semisubmerible Eirik Raude. The well was located to penetrate multiple targets, including the edge of an undrilled major Turonian fan system. Further drilling will be required to test core areas within the potentially giant stratigraphic trap where thicker Turonian reservoir sections are mapped.

 

The upside area of around 200 sq km includes two de-risked prospective parts, Owo and Ntomme. The well is 25 km west of the Jubilee Field. Tullow Exploration Director Angus McCoss said, "Tweneboa is another outstanding discovery offshore Ghana which maintains our 100 per cent success rate in the region. Substantial upside has been identified and a material appraisal program will follow. This result has the potential to deliver yet another transformational growth step for Tullow." Tullow operates the Deepwater Tano license with a 49.95 per cent interest. Partners include Kosmos Energy and Anadarko Petroleum, each with an 18 per cent interest, Sabre Oil & Gas with a 4.05 per cent interest and the Ghana National Petroleum Corporation (GNPC) with a 10 per cent carried interest.