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Tullow Oil said it had discovered more oil offshore Guyana.
The Joe-1 exploration well was drilled by to a total depth of 2,175 metres.
Evaluation of logging and sampling data confirmed that Joe-1 had encountered 14 metres of net oil pay in 'high-quality' oil-bearing sandstone reservoirs of Upper Tertiary age.
'Joe is the first oil discovery to be made in the Upper Tertiary and de-risks the petroleum system in the west of the Orinduik block, where a significant number of Tertiary and Cretaceous age prospects have been identified,' the company said.
Tullow Oil said it and its partners would now evaluate data from the Joe-1 discovery alongside data from the Jethro-1 discovery announced in August.
They were also awaiting the outcome of the Carapa well to determine the optimal follow-on exploration and appraisal programme.
'I am very pleased that we have made back-to-back discoveries in Guyana and successfully opened a new, shallower play in the Upper Tertiary age of the Guyana basin with our second well,' chief executive Angus McCoss said.
'The Joe-1 discovery and its surrounding prospects represent another area of significant potential in the Orinduik Block and we are greatly looking forward to the next phase of the programme as we continue to unlock the multi-billion barrel potential of this acreage.'