Oil prices rose by around 1% on Wednesday, boosted by evidence of declining production in China and falling U.S. inventories, while an upbeat OPEC statement on its planned output cut also supported the market.
A slightly weaker dollar reinforced the strength in oil as well, traders said, as it makes fuel purchases cheaper for countries using other currencies, potentially spurring demand.
Benchmark Brent crude futures were at $52.45 a barrel, up 77 cents by 1205 GMT (0805 EDT). U.S. West Texas Intermediate (WTI) crude oil futures were up 79 cents at $51.08 a barrel.
Saudi Arabian Energy Minister Khalid al-Falih said on Wednesday that oil markets were at the end of a considerable downturn as fundamentals were improving and supply and demand were rebalancing.
He called on non-OPEC producers to help stabilize the market saying their role was as critical as the role of OPEC members.
"Market forces are clearly working after a testing period of sub-$30 oil prices.... Oil demand is expanding at a healthy rate despite slower global growth," he said.
As the world's largest exporters prepare to discuss the first cut in output in eight years next month, the pressure of persistently low oil prices on higher-cost producers is becoming apparent.
China's crude output fell 9.8% to 3.89 million barrels per day, near its lowest in six years in their second-biggest year-on-year decline on record.
"The fall in Chinese crude oil production is probably attributable to the low price level, which makes parts of production unprofitable. This makes it all the harder to understand why OPEC is talking prices up with its current debate about production cuts, and is thus helping precisely those oil producers it would ideally like to force out of the market," Commerzbank analysts wrote.
Adding to the support to crude prices from lower output, refining rates in China rose last month. China processed 43.8 million tonnes (10.7 million bpd) of crude oil in September, up 2.4% from a year earlier.
U.S. crude stockpiles fell 3.8 million barrels in the week to Oct. 14, to 467.1 million, the API reported late on Tuesday.
The U.S. Energy Information Administration (EIA) is due to release official crude and fuel storage data on Wednesday.
Another drop would be the sixth fall in inventories in seven weeks.
Mohammed Barkindo, secretary general of the Organization of the Petroleum Exporting Countries (OPEC), gave the market a boost by saying he is confident about the prospects of a planned production cut following an OPEC meeting on November 30.
"I am optimistic we will have a decision," he said.
In its first output cut agreement since 2008, OPEC said it plans to reduce production to 32.50 million to 33.0 million bpd, compared with record output of 33.6 million bpd in September.
The group also hopes non-OPEC producers, especially Russia, will cooperate in a cut.