Tullow makes oil find with deepwater well off Ghana

By OGJ editors
HOUSTON, Aug. 22 -- Tullow Oil PLC has discovered a light oil accumulation with its Hyedua-1 well on the deepwater Tano license in 1,530 m of water off Ghana.

As the initial exploration well on the license, Hyedua-1 targeted the equivalent Santonian turbidite sandstones found in the Mahogany-1 discovery well, drilled about 5.3 km to the northeast on the adjacent West Cape Three Points license.

Hyedua-1, drilled to 4,002 m TD by the Fred Olsen Energy ASA Belford Dolphin deepwater drillship, encountered a 202 m gross reservoir interval containing 108 m of high-quality stacked reservoir sandstones and net hydrocarbon-bearing pay of 41 m.

Logs and pressure tests indicate the strong likelihood that the reservoir sands are in communication with those at the Mahogany discovery.

Well data results further suggest that the Hyedua-1 and Mahogany-1 wells could represent a continuous accumulation with combined hydrocarbon columns in excess of 361 m within a single continuous trap extending across the West Cape Three Points and Deepwater Tano blocks, the company said.

Hyedua-1 will be sidetracked, prior to casing, to acquire core data over the reservoir interval and suspended for potential use as a development well.

Tullow will now appraise the accumulation. Suitable vessels have been identified to carry out a 910 sq km 3D seismic survey, covering the combined feature on both blocks, and a program of up to three additional appraisal wells late this year.

Tullow operates the Tano license with a 49.95% interest and holds 22.9% interest in the West Cape Three Points license.

Tullow's partners in the Tano license are Kosmos Energy and a subsidiary of Anadarko Petroleum Corp., each with 18% interest; Sabre Oil & Gas with 4.05%; and Ghana National Petroleum Corp. with a 10% carried interest.

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