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Tweneboa Confirmed as Major Field Offshore Ghana

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Atwood Hunter
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The Tweneboa-2 exploratory appraisal well, being drilled some 6 km southeast of the Tweneboa-1 discovery, has intersected a significant combined hydrocarbon column. Results of drilling, wireline logs and samples of reservoir fluids establish that Tweneboa is a major oil and gas-condensate field.

The well has encountered a gross reservoir interval of 153 meters containing 32 meters of net hydrocarbon pay in stacked reservoir sandstones, comprising a 17 meter oil bearing zone below a 15 meter gas-condensate bearing zone.

A combined hydrocarbon column of at least 350 meters has been established between the lowest known oil in Tweneboa-2 and the top of the gas-condensate at Tweneboa-1, demonstrating this is a highly prospective and extensive turbidite fan system that will be evaluated with additional drilling.

Following completion of logging operations the well will be deepened to test further exploration potential beneath the Tweneboa field. The well will then be suspended for future use in appraisal and development.

The Atwood Hunter semisubmersible drilled Tweneboa-2 in the Deepwater Tano block to an interim depth of 3,860 meters in water depths of 1,321 meters. On completion of operations on Tweneboa-2, the rig will move to drill an exploration well in the West Cape Three Points block east of the Jubilee field.

Tullow (49.95%) operates the Deepwater Tano license and is partnered by Kosmos Energy (18%), Anadarko Petroleum (18%), Sabre Oil & Gas (4.05%) and the Ghana National Petroleum Corporation (GNPC) (10% carried interest).

Commenting today, Angus McCoss, Exploration Director, said, "Tweneboa-2 was a bold step-out which has successfully proven the significant extent of a major new oil and gas-condensate field offshore Ghana. Such an achievement provides a very good start to our exciting 2010 Equatorial Atlantic campaign. We look forward to further appraising this discovery later in the year."

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