* Oil gives up Wednesday's gains
* WTI backs off 15-month highs
* Market worries as Russia mulls higher output (Recasts; updates market activity and comments to settlement)
By Ethan Lou
NEW YORK, Oct 20 (Reuters) - Oil prices settled down more than 2 percent on Thursday, as a resurgent dollar encouraged players to take profit on the previous day's rally that sent U.S. crude to 15-month highs.
The dollar hit seven-month highs against a basket of currencies .DXY and a three-month peak versus the euro EUR= after the European Central Bank kept interest rates unchanged and U.S. data showed home resales surged in September. Brent crude for December delivery LCOc1 settled down $1.29, or 2.5 percent, at $51.38 per barrel.
U.S. West Texas Intermediate (WTI) crude's November contract CLc1 , which expired as the front-month, fell $1.17, or 2.3 percent, to finish at $50.43. WTI's December contract CLc2 , which will be front-month from Friday, slid $1.19 to settle at $50.63.
On Wednesday, oil rallied after the U.S. government reported an unexpected drawdown of more than 5 million barrels in weekly crude stockpiles that drove WTI's November contract to a 15-month high of $51.93. EIA/S
"This is predominately being driven by the dollar's strength," Matt Smith, director of commodity research New York's ClipperData said, referring to Thursday's retreat.
"It's also to do with the dust settling on yesterday's report and the realization that it wasn't quite as bullish."
Some market participants noted that despite the crude drawdown, the EIA also reported an unexpected build of 2.5 million barrels in gasoline stockpiles instead of the drop that was forecast.
There was also growing skepticism about the Organization of the Petroleum Exporting Countries' (OPEC) upcoming plan to limit production, said Tariq Zahir, trader at Tyche Capital Advisors in New York.
"The comments overnight, of (OPEC) talking with Russia about whether they can increase their production levels, is putting into doubt whether there is going to be an agreement," he said.
The chief executive of Russia's Rosneft ROSN.MM has said the state oil producer has potential to add as much as 200 million tonnes a year, or about 4 million barrels per day, to its output. Thursday's drop, oil prices are still up about 13 percent since OPEC announced on Sept. 27 its first planned output cut in 8 years to rein in a global glut that halved prices from mid-2014 highs above $100 a barrel. oil industry officials differed in their market outlook at a conference in Paris, with Total's TOTF.PA CEO optimistic of OPEC's ability to balance the market with output cuts while Technip's TECF.PA head suggested the oil price crisis will last another two years. GRPHIC-U.S. oil technicals
http://tmsnrt.rs/2e9qWyD GRAPHIC-Brent oil technicals
http://tmsnrt.rs/2eHC5G4
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