Tullow Oil said that the Onyina-1 exploration well in the deepwater Tano licence offshore Ghana has encountered water bearing reservoirs.
The well was drilled to explore a large, high-risk Campanian prospect between the Tweneboa and Jubilee fields in the northeast of the Tano Licence.
It intersected 49m of good quality sandstone reservoir, on prognosis, however they were water bearing at this location, Tullow said.
The Sedco-702 semi-submersible rig drilled Onyina-1 to a total depth of 2,730m in water depths of 828m.
Tullow holds a 49.95% carried interest in the deepwater Tano licence and is its operator.
Tullow is an independent oil and gas exploration and production company headquartered in London.