Tullow hits jackpot again off Ghana

Tullow Oil has made another potentially major oil discovery in Ghana’s deepwater play fairway.

Offshore staff

LONDON -- Tullow Oil has made another potentially major oil discovery in Ghana’s deepwater play fairway.

Owo-1, drilled in 1,428 m (4,685 ft) of water in the Deepwater Tano license offshore Ghana, intersected “a significant column of excellent quality light oil.” Analysis of drilling, wireline logs and reservoir fluid samples suggest this is a large new oil field warranting further appraisal.

The deviated well, drilled by the semisubmersible Sedco 702 from a location around 6 km (3.7 mi) west of the Tweneboa wells, encountered a gross vertical reservoir interval of 154 m (505 ft), including 53 m (174 ft) of net oil pay in two zones of good-quality, stacked reservoir sandstones.

Pressure data suggest that these zones form part of the same accumulation; samples indicate a light oil (33-36º API).

Once logging operations are complete, the well will be side tracked 0.6 km (0.4 mi) to the east in an attempt to determine lateral reservoir distribution, and also to intersect a deeper part of the Owo channel system.

Owo-1 was drilled to a final depth of 3,891 m (12,766 ft). On completion of the side track, the rig will drill the Onyina-1 exploration well elsewhere in the Deepwater Tano block, targeting a large fan/channel system between the Tweneboa and Jubilee fields.

Tullow (49.95%) operates the license in partnership with Kosmos Energy Ghana (18%), Anadarko Petroleum (18%), Sabre Oil & Gas (4.05%), and the Ghana National Petroleum Corp. (GNPC) (10% carried interest).

07/26/2010

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