Oil Ends Down Again as Supply Worry, Dollar Strength Weigh

NEW YORK, Nov 6 (Reuters) - Oil markets fell on Thursday after a one-day spike as worries about high supplies returned to haunt traders, while the dollar pressed on with its rally which weighed on commodities priced in the currency.

Benchmark Brent and U.S. crude, however, ended off the day's lows as stocks on Wall Street hit record highs in late afternoon trade, lending some optimism to oil.

At the close, Brent's front-month was down 9 cents at $82.86 a barrel, compared to its 90 cent-fall earlier in the day. U.S. crude finished down 77 cents at $77.91, after tumbling as much as $1.56 during the session.

Prices rose a day ago after rumors of a Saudi pipeline blast and data showing U.S. crude inventory builds at just a fifth of levels forecast last week. Brent finished Wednesday's session slightly higher while U.S. crude jumped nearly 2 percent.

On Thursday, oil prices came under renewed pressure after OPEC's insistence that it was "not panicking" over the near 30 percent fall in Brent's value since June. Traders took that to mean there will be no output cuts at OPEC's Nov. 27 meeting.

The dollar rallied to a more than two-year high against the euro after the European Central Bank kept interest rates at record lows. The greenback was also boosted by data showing fewer filings of new U.S. unemployment benefit claims in the previous week.

"We don't seem to have any ability by any oil producer to cut production," said Gene McGillian, senior analyst at Tradition Energy in Stamford, Connecticut. "But we have fears of an European recession, lower-than-expected Chinese growth and strong U.S. recovery that is boosting the dollar."

"We may look oversold on oil but until we get the factors for a sustained rebound, I don't think we have hit bottom."

Oil traders were also wary about the possibility of an Iranian nuclear agreement soon that could ease sanctions on Tehran's crude exports, adding to global production.

U.S. Secretary of State John Kerry said on Wednesday a deal between Iran and six world powers would be harder to achieve after a Nov. 24 deadline, suggesting a degree of urgency ahead of planned talks in Oman next week.

Samuel Ciszuk, senior adviser on supply security at the Swedish Energy Agency, told the Reuters Global Oil Forum on Wednesday he gave a 50-50 chance for a deal or compromise being reached on Iran.

Not everyone is gloomy with their oil outlook though.

North Dakota oil producer Continental Resources is among the few betting on a rally.

"We have elected to monetize nearly all of our outstanding oil hedges, allowing us to fully participate in what we anticipate will be an oil price recovery," Harold Hamm, chief executive at the firm, said.

(Additional reporting by Sam Wilkin in London and Seng Li Peng in Singapore; Editing by Marguerita Choy and Chris Reese)

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