OPEC official: Oil to stay above $50

ROME (Reuters) - World oil prices will stay above $50 a barrel over the next two to three years, while OPEC's reference crude will stay at or above $40, the producer group's head of research said Tuesday. "In the near future, I mean over two to three years, the OPEC basket price will not go below $40," Adnan Shihab-Eldin said at a conference.