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UPDATE 2-Oil extends gains as Saudi pledges export curbs

* Saudi Arabia to curb exports to 6.6 mln bpd in Aug

* OPEC to tackle weak adherence of some members on output curbs

* U.S. crude stocks may show 3 mln-barrel drop -preliminary poll (Adds details and comment in paragraphs 8-9, China crude import outlook in paragraph 13, and updates prices)

TOKYO, July 25 (Reuters) - Oil prices extended gains on Tuesday after Saudi Arabia pledged to curb exports from next month and OPEC called on several members to boost compliance with output cuts to help rein in oversupply and tackle flagging prices.

Gains were also supported by a warning from Halliburton's executive chairman that the growth in North America's rig count was "showing signs of plateauing," a possible threat to U.S. shale oil production.

Global benchmark Brent crude for September delivery was up 28 cents at $48.88 a barrel by 0540 GMT after settling up 1.1 percent.

U.S. West Texas Intermediate (WTI) futures were up 28 cents at $46.62.

In a meeting in St. Petersburg on Monday, the Organization of the Petroleum Exporting Countries (OPEC) and non-OPEC producers discussed extending their deal to cut output by 1.8 million barrels per day (bpd) beyond March 2018 if necessary.

Saudi Energy Minister Khalid al-Falih added his country would limit its crude exports to 6.6 million bpd in August, almost 1 million bpd below levels of a year ago.

Nigeria voluntarily agreed to join the deal by capping or cutting its output from 1.8 million bpd, once it stabilizes at that level. Nigeria, which has been producing 1.7 million bpd recently, had been exempt from the output cuts.

OPEC said stocks held by industrial nations had fallen by 90 million barrels over January to June, but were still 250 million barrels above the five-year average, which is the target for OPEC and non-OPEC.

"Despite the goals for rebalancing, the market is still not sure that inventories would fall precipitously to achieve their target," said Tomomichi Akuta, senior economist at Mitsubishi UFJ Research and Consulting in Tokyo.

Russian Energy Minister Alexander Novak said an additional 200,000 bpd of oil could be removed from the market if compliance to OPEC-led deal was 100 percent.

"In our view ... these meetings were aimed at saving face and diverting the market's attention away from Iraq's poor compliance, shale's resilience, and Libya's and Nigeria's markedly higher output," Britain's Barclays bank said.

China's crude imports will exceed 400 million tonnes (8 million bpd) this year and likely grow by double digits next year, a Sinopec Group executive said.

U.S. commercial crude oil inventories likely fell by 3 million barrels last week, a preliminary Reuters poll showed ahead of a data release from the American Petroleum Institute.

(Reporting by Osamu Tsukimori; Editing by Richard Pullin and Tom Hogue)