Tullow Oil said it has discovered a major oil and gas condensate field offshore Ghana in the Deepwater Tano block.

Drilling was carried out at the Tweneboa-2 exploratory appraisal well, which was found to have a major combined hydrocarbon column of 350m.

The well unearthed a 153m gross reservoir interval containing 32m of net hydrocarbon pay in stacked reservoir sandstones, comprising a 17m oil-bearing vein underneath a 15m gas-condensate bearing vein.

The hydrocarbon column demonstrated that it is a prospective and extensive turbidite fan system that will be evaluated through additional drilling.

Once logging operations are completed, the well will be deepened to evaluate additional exploration potential underneath the Tweneboa field.

Subsequently, the well will be suspended for future deployment in appraisal and development.

Tweneboa-2 was drilled to a 3,860m interim depth in 1,321m water depth using the Atwood Hunter semi-submersible rig.

Tullow, operator of the Deepwater Tano licence with 49.95% stake, has collaborated with Kosmos Energy (18%), Anadarko Petroleum (18%), Sabre Oil & Gas (4.05%) and the Ghana National Petroleum Corporation (10% carried interest).