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Brent swings to 16-month highs on Opec deal
US crude, meanwhile, settles 3.3% higher and well above $50 per barrel
Oil prices surged 4% on Thursday, with Brent crude at its highest in about 16 months, extending gains after Opec and Russia agreed to restrict output to reduce the global supply glut more quickly.
Opec agreed on Wednesday to its first oil output reduction since 2008 after the group's leading producer Saudi Arabia accepted "a big hit" and dropped a demand that arch-rival Iran also slash output.
The deal also included Opec's first coordinated action in 15 years with non-member Russia. Azerbaijan said it was also willing to discuss cuts.
Doubts about the historic deal were widespread in the market.
"It remains to be seen how well they stick to the plan, but if Opec hadn't come to an agreement the probability is that oil prices would have fallen to $40 a barrel, perhaps even lower," said Simon Flowers, chief analyst at consultancy Wood Mackenzie.
"Brent was trading at about $50 a barrel after the announcement, and we expect it to trade at an average of $55-$60 per barrel in 2017."
Benchmark Brent futures settled 4.1% or $2.10 higher at $53.94. Earlier in the session, prices jumped as much as 5.2% to $54.53 a barrel, the highest level since 27 July 2015.
US crude ended the session at $51.06, up $1.62 or 3.3% on the day. Its session high was $51.80 a barrel, 13 cents below its 2016 high.
Brent crude's premium to US crude widened to the biggest in about 10 weeks.
US refined products also rose along with crude - ultra low sulphur diesel (ULSD) futures soared as much as 5.5% to its highest in more than a year while gasoline futures jumped as much as 6%.
The Opec deal triggered frenzied trading, with Brent futures hitting record trading volumes for February and March, when the supply cuts should start to be visible in the market.
The Intercontinental Exchange said ICE Brent crude futures hit a daily volume record of 1.96 million contracts on Wednesday while the CME Group said open interest in WTI futures rose to a record 2.1 million contracts on the day of the Opec agreement.
Even after Thursday's steep rise, oil prices remained about half their mid-2014 levels, when prices began to collapse to the lowest in a generation.
Opec produces a third of global oil, or around 33.6 million barrel per day, and the deal aims to reduce output by 1.2 million bpd from January 2017, similar to January 2016 levels.
"It's clearly too soon to know what beyond the short-term market gain will be the consequences of this mini-renaissance of Opec - for other producers and for the group itself," Credit Suisse analysts said.
Others noted that the cuts could leave the field open for other producers, especially US shale drillers.
"We do not believe that oil prices can sustainably remain above $55 per barrel, with global production responding first and foremost in the US," Goldman Sachs said.
The head of the International Energy Agency Fatih Birol warned of greater volatility after the Opec deal.
"Unlike in the past Opec decisions, if prices move to around $60, a substantial amount of oil in United states is ready to come to the markets," Birol said.
Opec will hold talks with non-Opec producers on 9 December. The group will also have its next meeting on 25 May to monitor the deal, which it said it could extend for six months.