Iranian Minister of Petroleum Rostam Ghasemi speaks to journalists before the start of the meeting of the Organization of the Petroleum Exporting Countries (OPEC) at its headquarters in Vienna, Austria, on Wednesday, Dec. 12, 2012. (AP Photo/Ronald Zak)

Photo by: Ronald Zak

Iranian Minister of Petroleum Rostam Ghasemi speaks to journalists before the start of the meeting of the Organization of the Petroleum Exporting Countries (OPEC) at its headquarters in Vienna, Austria, on Wednesday, Dec. 12, 2012. (AP Photo/Ronald Zak)