HONG KONG (MarketWatch) -- OPEC members have agreed to roll back oil production to quotas agreed in September 2007, a level that will cut output by about 500,000 barrels a day. An OPEC statement issued at the conclusion of its meeting Wednesday said the organization agreed to produce 28.8 million barrels a day. An Associated Press report cited OPEC President Chakib Khelil as saying the quota meant that member countries agreed cut back production by 530,000 barrels a per day.