If Nigeria and Libya restore production, the kingdom may need to cut twice as much. U.S. shale drillers also stand ready to fill any supply gap.

U.S. West Texas Intermediate (WTI) crude futures were trading at $49.22 per barrel at 0649 GMT, up 53 cents, or 1.1 percent, from their last settlement. In international oil markets, benchmark Brent crude was trading at $51.38 per barrel, up 51 cents, or 1.0 percent.

Russian oil production continuing its slow climb for at least the next five years.

December Brent crude futures LCOc1 were last up 42 cents at $50.61 a barrel by 0913 GMT, off a session low of $49.74, while U.S. crude futures CLc1 rose 37 cents to $48.61 a barrel, above the day's low at $47.78.

"OPEC made an exceptional decision today ... After two and a half years, OPEC reached consensus to manage the market," said Iranian Oil Minister Bijan Zanganeh, who had repeatedly clashed with Saudi Arabia during previous meetings.

The November contract for global crude benchmark Brent was up 0.78% at $46.33 while its U.S. counterpart West Texas Intermediate gained 0.58% to hit $44.94.

“We need a gentle adjustment to reassure the market,” Mr. Falih said at a briefing where he was flanked by his Russian counterpart, Alexander Novak.

U.S. West Texas Intermediate (WTI) crude had fallen 38 cents to $45.55 a barrel by 0103 GMT, after rising $1.45, or 3.3 percent, in the previous session. Brent crude futures slipped 43 cents to $46.91 a barrel after closing up $1.46, or 3.2 percent.

Brent crude futures LCOc1 rose 73 cents to $46.62 a barrel by 1052 GMT, having rallied from a session low of $45.74, while U.S. crude prices CLc1 rose 54 cents to $45.02 a barrel.

U.S. West Texas Intermediate (WTI) crude oil futures CLc1 were trading at $45.81 per barrel at 0301 GMT (11:01 p.m. EDT), up 47 cents, or 1 percent, from their previous close. The contract had already gained as much as 3 percent the day before. International benchmark Brent crude futures LCOc1 were also up, gaining 48 cents, or 1 percent, from their last close to $47.31 per barrel.

U.S. West Texas Intermediate (WTI) crude oil futures CLc1 were trading at $45.81 per barrel at 0301 GMT (11:01 p.m. EDT), up 47 cents, or 1 percent, from their previous close. The contract had already gained as much as 3 percent the day before. International benchmark Brent crude futures LCOc1 were also up, gaining 48 cents, or 1 percent, from their last close to $47.31 per barrel.

U.S. West Texas Intermediate (WTI) crude futures were up 1.8 percent, or 81 cents, at $44.86 a barrel at 0403 GMT. The October contract expired yesterday at $43.44 a barrel and the front-month has now rolled over to November delivery. International Brent crude futures were at $46.47 per barrel, up 59 cents, or 1.3 percent, from their last close.

Brent crude futures were at $46.54 per barrel at 0645 GMT (02:45 a.m. EDT), up 77 cents, or 1.7 percent, from their previous settlement. U.S. crude was up 78 cents, or 1.8 percent, at $43.81 a barrel.

Prices may jump more than 35 percent from current levels as they start to reflect the risk of a supply squeeze, according to Citigroup Inc. and trader Gunvor Group.

“We see 2017-2020 as still having the potential for much higher prices. After 2020, there is a high risk that electric vehicle penetration will change the oil market forever.”