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UPDATE 9-Oil rangebound as unease builds ahead of OPEC meeting

* OPEC meets in Vienna on Friday

* OPEC panel to discuss extending oil cut deal, tracking exports

* Oil up more than 15 pct in Q3

* U.S. crude production reaches pre-Harvey storm levels

* Brent in a sustained backwardation for the first time July 2014 (New throughout, updates prices, market activity and analyst comment)

NEW YORK, Sept 21 (Reuters) - Oil prices were largely steady on Thursday as traders waited to see whether oil-producing countries set to meet in Vienna would extend production limits that have helped reduce the global crude glut.

Ministers from the Organization of the Petroleum Exporting Countries, Russia and other producers meeting in Vienna on Friday, will discuss a possible extension of a deal to cut 1.8 million barrels per day (bpd) of supply to support prices and will consider monitoring exports to assess compliance.

While many analysts expect them to extend the deal that currently lasts until March, many also said prices at current levels could encourage some countries to boost production.

Even if the deal is extended, "compliance looks to be a bit of an issue" if prices rise much from current levels, said John Kilduff, partner at Again Capital LLC in New York.

He noted that oil prices have surged more than 15 percent over the last three months as global supply has tightened.

"The bull run in the oil market is running out of steam as unease builds ahead of tomorrow's OPEC/non-OPEC meeting," said Stephen Brennock, analyst at London brokerage PVM Oil Associates.

By 12:23 p.m. ET (1623 GMT), global benchmark Brent crude had dipped 5 cents a barrel, or 0.09 pct, to $56.24 a barrel. U.S. crude was down 14 cents, or 0.28 percent, at $50.55 a barrel.

"We're a little rangebound and choppy, not too much of a direction," said Tariq Zahir, a trader with Tyche Capital Advisors in New York.

After a strong rise in prices over the last three months, he said, there were signs that output was rising especially among U.S. shale producers.

OPEC's output cuts have boosted prices enough to encourage higher production elsewhere. U.S. shale production, especially, has been growing to record highs.

Hurricanes in the Gulf of Mexico have also pushed up crude inventories in some parts of the United States as refineries have been shut by flooding.

U.S. crude production has reached 9.51 million bpd, up from 8.78 million bpd after Hurricane Harvey hit the U.S. Gulf. <C-OUT-T-EIA>

Rising U.S. production is "a reminder to the market that OPEC has a significant problem on its hands from the continued rise in shale output," Kilduff said.

Front-month Brent futures have risen sharply in recent months, much more than forward prices and the contango, a symptom of an oversupplied market, has gradually disappeared from most crude markets to be replaced by backwardation, a sign of tightness.

Brent futures have traded in a sustained backwardation, where the back months are cheaper than the front month contract, for the first time since oil prices started slumping in July 2014.

Brents backwardation, initially confined to the contracts nearest expiry, now extends throughout the whole of next year.

(Additional reporting by Christopher Johnson in London, Henning Gloystein in Singapore; Editing by Marguerita Choy and Alexander Smith)