When OPEC reached a deal last year to cut oil output, the decision to exclude Nigeria and Libya from the restrictions was seen as a risk to the group's efforts to curb a global crude glut.

An oil price rally has already stumbled since the deal, but Nigeria and Libya are not to blame. Output from both nations has slipped since December and violence in the two African states makes their ambitions to hike production look optimistic.

OPEC members and non-OPEC producers agreed to cut output by 1.8 million bpd for six months from Jan. 1. OPEC has broadly cut the amount pledged, while others have not delivered in full.

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