The London-listed company disclosed this in a statement, Tuesday.
The company, however failed to hit the main target, as its Okure-1 probe did not strike hydrocarbons in the main objective levels.
But, the probe, according to the company, encountered light oil of 40 degrees API in a gross 17-metre pay interval in Turonian-age sandstones within an overlying secondary objective, after being drilled to a total depth of 4511 metres,
Integration of wireline logs and pressure data indicated the oil accumulation is not connected to other hydrocarbon discoveries in the licence area, the company said in the statement.
The UK independent has also brought on stream Phase 1A of its Jubilee oilfield off the West African country.