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UPDATE 1-Oil stable on tightening fundamentals, but China spooks market

* Crude fell previous day after China warning spooked markets

* But overall oil supply/demand fundamentals are tightening

* Global refiners import U.S. oil to make up for OPEC cuts (Adds "Minsky moment" reference, updates prices)

SINGAPORE, Oct 20 (Reuters) - Oil prices were stable on Friday, supported by signs of tightening supply and demand fundamentals, but a warning about excessive China economic optimism spooked traders and weighed on markets.

Brent crude futures, the international benchmark for oil prices, were at $57.22 at 0146 GMT, virtually unchanged from their last close.

U.S. West Texas Intermediate (WTI) crude futures were at $51.31 per barrel, up 5 cents.

The stable prices came after a more than 1 percent fall in prices the previous day.

This was put down to profit-taking following four days of straight gains, but also to a broader market slump which spooked traders after the veteran but outgoing governor of China's central bank warned of a "Minsky moment", a reference to excessive optimism about economic growth fuelled by vast debt and speculative investment.

Beyond this, analysts said there were indicators of a tightening oil supply and demand fundamentals.

U.S. commercial crude oil stocks have dropped 15 percent from their March records, to 456.5 million barrels, below levels seen last year. <C-STK-T-EIA>

Part of this drawdown has been due to rising exports as a result of the steep discount of WTI crude to Brent, which makes it attractive for American producers to export their oil. <CL-LCO1=R>

RBC Capital Markets said, "A strong indicator that global inventories are being run down will be when the market starts relying on U.S. exports to fill deficits."

That moment may have arrived.

Shipping data in Thomson Reuters Eikon shows that overseas U.S. crude oil shipments have soared from virtually zero before the government loosened export restrictions in late 2015 to around 2.6 million barrels per day (bpd) in October.

Exports were further boosted since a production cut led by the Organization of the Petroleum Exporting Countries (OPEC) has been in place since January this year, and which OPEC wants to expend beyond its current expiry date at the end of March 2018.

"Physical bottlenecks are unlikely to kick in until waterborne (U.S.) exports approach 3.2 million bpd," RBC Capital Markets said.

(Reporting by Henning Gloystein; Editing by Kenneth Maxwell)