Tullow group has Ghana deepwater oil find

By OGJ editors
HOUSTON, July 26
– A group led by Tullow Oil PLC will sidetrack a two-zone deepwater discovery off Ghana to further define sand continuity and test a deeper and laterally offset part of the Owo channel system.

The Owo-1 discovery well went to 12,765 ft in 4,685 ft of water on the Deepwater Tano block west of the northern part of Tweneboa field. It cut 174 net ft of high-quality oil pay in two zones of stacked Turonian-age reservoir sands in a gross vertical reservoir interval of more than 500 ft.

Pressure data indicate the zones are part of the same accumulation. The oil appears to be light and 33-36° gravity.

Cores are to be cut to provide more reservoir data needed for a potential development plan. After the sidetrack is complete, the rig will be moved to drill the Onyina prospect near the block’s northeast corner.

Owo is the partnership’s third substantial discovery after Jubilee and Tweneboa. The group plans to continue an active drilling program into 2011 with multiple appraisal wells at Tweneboa and the adjacent Owo discovery, said partner Anadarko Petroleum Corp.

The group will also resume westward expansion in the Cretaceous fan play, where it has identified more than 30 prospects and leads with size and geological characteristics similar to Jubilee across its 8 million gross acre position off Ghana, Ivory Coast, Liberia, and Sierra Leone.

Tullow operates Deepwater Tano with 49.95% working interest, and Anadarko has 18%. Other participants are Kosmos Energy 18%, Sabre Oil & Gas 4.05%, and Ghana National Petroleum Corp. 10% carried.

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