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UPDATE 4-Oil prices rise as OPEC says market is rebalancing

* Global oil inventories are falling -OPEC

* Crude price curve has flipped into backwardation

* 1.5 mln bpd of U.S. Gulf output offline after storm Nate

* But analysts don't expect U.S. disruptions to last long

* Gunvor says OPEC cannot "afford to let up" on cuts (Adds Gunvor CEO comment, updates prices)

SINGAPORE, Oct 10 (Reuters) - Oil prices edged up on Tuesday as OPEC said there were clear signs the market was rebalancing and as U.S. production remained offline following Hurricane Nate.

U.S. West Texas Intermediate (WTI) crude futures were trading at $49.65 per barrel at 0648 GMT, up 7 cents, or 0.1 percent, from their last close.

Brent crude futures, the international benchmark for oil prices, were up 12 cents, or 0.2 percent, at $55.91 a barrel.

Traders said prices were supported as the Organization of the Petroleum Exporting Countries (OPEC) said oil markets were rebalancing fast after years of oversupply.

"There is clear evidence that the market is rebalancing," OPEC's secretary general Mohammad Barkindo told Reuters on Monday, repeating the message again in India on Tuesday.

"The process of global destocking continues, both onshore and offshore, with positive developments in recent months showing not only a quickening of the process but a massive drainage of oil tanks across all regions," he said.

OPEC has led an effort to cut output to end years of overproduction that created a huge supply overhang.

Tighter market conditions are reflected in the shape of the Brent crude forward curve, which has flipped from contango - when future deliveries are priced higher than those for immediate sale - into backwardation, when it is more profitable to sell oil promptly than storing it for sale later.

STRONG ENOUGH DEMAND?

The OPEC-led production cuts started in January and are set to expire at the end of March 2018. There have been talks about extending the curbs, but no formal agreement has been reached.

JP Morgan said that previous "concerns that OPEC compliance would fade into the fourth quarter now appear unfounded", and that "stronger than assumed economic growth offers the potential for tight market conditions to continue if OPEC extends the current deal for another nine months".

Short-term price support was also coming from the United States, where 85 percent of U.S. Gulf of Mexico oil production, or 1.49 million barrels a day, was offline following Hurricane Nate, according to the U.S. Department of the Interior's Bureau of Safety and Environmental Enforcement late on Monday.

Oil companies evacuated staff from Gulf platforms and curtailed output ahead of the storm, which hit the region last weekend.

Traders said they did not expect the disruptions to last long.

"Units that were shut down as a precautionary measure in the advent of Tropical storm Nate have commenced restarting of operations. Not much damage appears to have been done," said Sukrit Vijayakar, managing director of consultancy Trifecta.

Since the start of the year, U.S. oil production has risen by 10 percent to over 9.5 million barrels per day (bpd), potentially undermining OPEC's efforts to re-balance the market.

"OPEC ... cannot afford to let up, because more oil is coming and the question is: 'Is the demand increase big enough to absorb that?'," Torbjorn Tornqvist, chief executive of trading house Gunvor told Reuters on Tuesday.

(Reporting by Henning Gloystein; Editing by Joseph Radford and Tom Hogue)