Ghana's Tweneboa proved as major oil-gas field

Eric Watkins
OGJ Oil Diplomacy Editor

LOS ANGELES, Jan. 21 -- Tullow Oil PLC said its Tweneboa-2 exploratory appraisal well, being drilled 6 km southeast of the Tweneboa-1 discovery, has intersected a “significant” combined hydrocarbon column.

“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,” said Angus McCoss, Tullow exploration director.

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

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

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

Tweneboa-2 was drilled using the Atwood Hunter semisubmersible on Deepwater Tano block to an interim depth of 3,860 m in 1,321 m of water.

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 Jubilee field.

Tullow operates the Deepwater Tano license, holding 49.95%. Partners include Kosmos Energy 18%, Anadarko Petroleum Corp. 18%, Sabre Oil & Gas 4.05%, and the Ghana National Petroleum Corp. with 10% carried interest.

Contact Eric Watkins at

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