Oil held above $63 on Thursday after OPEC ministers meeting in Vienna decided, as widely anticipated, to leave the group's crude output unchanged at 24.85 million barrels per day.
U.S. crude oil for July delivery was up 45 cents at $63.90 a barrel by 1404 GMT after having briefly touched $64.19, its highest level since mid-November.
London Brent crude rose 64 cents to $63.14.
Oil has climbed back from a low of $32.40 last December to a six-month high above $63 on Wednesday, and Saudi Arabia's Oil Minister Ali al-Naimi told reporters in Vienna the world was ready to cope with a barrel price range of $75-$80.
On Thursday Naimi told reporters that OPEC had decided to keep its output target unchanged.
"Stay the course, that's the decision," Naimi said at the end on an almost two-hour meeting of the Organization of the Petroleum Exporting Countries.
Analysts said the decision to leave output unchanged was expected and had been thoroughly priced in to the market beforehand
"This decision is going to be fairly market-neutral in the short run — it's what the market was expecting," said Andrey Kryuchenkov, analyst at VTB Capital in London.
"In the long-run, if they can stick to 80-85 percent compliance, it will be market supportive as inventories will start to come down — as long as demand doesn't deteriorate further."
YIELD SPIKE
European shares were lower on Thursday, tracking a decline on Wall Street, after a spike in Treasury yields triggered a sell off in equity markets.
Concerns about the debt burden facing countries trying to spend their way out of the economic downturn scared investors on Thursday in spite of optimism from President Barack Obama that the U.S. economy was past the worst.
"It's safe to say we have stepped back from the brink," Obama told a fundraiser in Beverly Hills. "There is some calm that didn't exist before."
Data on Thursday showed the pace of economic decline in western Europe is slowing, with the Business Climate Indicator (BCI) rising to -3.17 points from an upwardly revised -3.26 in April, its first improvement over two straight months since May 2008.
Analysts said oil's recent highs have followed resurgent global equity markets in spite of weak underlying fundamentals of excess supply and poor demand for refined petroleum products.
"In the near term, oil will likely retain its high level of correlation in daily return with equities, but equally with (foreign exchange) as long as oil is kept off the market in storage," said BNP Paribas senior oil analyst Harry Tchilinguirian.
"When that oil starts coming back, depressing the prompt, we can expect that relation to loosen."
OPEC Secretary General Abdullah al-Badri said the oil market was still oversupplied, with around 130 million barrels of crude and refined products currently stowed in floating storage.
Industry officials and analysts estimate a range of 100 million to 130 million barrels of crude oil stored at sea in 50 to 53 vessels, as sellers profit on oil for prompt delivery being cheaper than for future delivery.
The American Petroleum Institute said in its report after oil markets closed on Wednesday that crude stocks fell 2.8 million barrels to 364.7 million barrels last week.
"I think the stark draw in the APIs during the night has stopped oil from going lower," Bache Commodities broker Christopher Bellew said.
A Reuters poll of 11 analysts showed U.S. crude inventories likely fell around 700,000 barrels last week. The U.S. Energy Information Administration will release its holiday-delayed weekly report on Thursday at 1500 GMT.
