Tullow Group finds oil at Tweneboa off Ghana

By OGJ editors
HOUSTON, Mar. 9 -- A group led by Tullow Oil PLC encountered oil at the Tweneboa-1 exploration well off Ghana and continued drilling towards other objectives.

The well cut 70 ft of pay in a light hydrocarbon accumulation in sands of similar age as those in Jubilee field to the east.

Partner Kosmos Energy LLC, Dallas, said the recoverable resource base off Ghana now stands at several billion barrels of oil and several trillion cubic feet of gas.

"The Tweneboa well was positioned to target multiple objectives, including the edge of this large Turonian fan," said partner Anadarko Petroleum Corp. "We believe there is significant additional upside as we conduct appraisal activity closer to the perceived core of this stratigraphic trap where a thicker reservoir section is mapped."

Tullow Oil said, "Further drilling will now be required to test core areas within this potentially giant stratigraphic trap where thicker Turonian reservoir sections are mapped. The upside area of approximately 200 sq km includes two derisked prospective parts, Owo and Ntomme."

Tweneboa-1, in 3,770 ft of water on the Deepwater Tano license, was drilled, logged, and cased to 11,790 ft. It is to be deepened to more than 13,000 ft. The location is in the Tano basin 16 miles west of Jubilee field (see map, OGJ, Feb. 9, 2008, p. 38).

On completion, the rig will move back to Jubilee field. The partnership also plans to appraise Tweneboa and the recent Odum and Mahogany Deep discoveries on the West Cape Three Points block. It also plans the Teak exploration well on West Cape Three Points and the Onyina exploration well on Deepwater Tano.

Deepwater Tano interests are Tullow Ghana Ltd. operator with 49.95%, Anadarko and Kosmos Energy 18% each, Sabre Oil & Gas 4.05%, and Ghana National Petroleum Corp. a 10% carried interest.

Interests in West Cape Three Points are Kosmos Energy operator with 30.875%, Tullow 22.896%, K G Group of Ghana 3.5%, Sabre 1.854%, and GNPC 10% carried.