Drilled on its South Omo block, Sabisa-1 penetrated to a total depth of 1810 metres, hitting hydrocarbons in sands underlying a thick claystone top seal.

UK-listed Tullow has a 50% operating stake in South Omo. Africa Oil has 30% and US oil player Marathon Oil is on 20%.

Africa Oil chief executive Keith Hill insisted the hydrocarbon suggestions were “highly encouraging as evidence of a working petroleum system in a previously undrilled basin”.

Tullow