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UPDATE 7-Oil rallies 3 percent as U.S. shale shows signs of slowdown

* Anadarko cuts capital budget by $300 million

* Saudi Arabia to limit exports to 6.6 mln bpd in August

* OPEC to tackle some members' compliance with output deal

* Weaker U.S. dollar supports oil prices

* Coming Up: U.S. crude inventory data from API, EIA (New throughout, updates prices, market activity and comments; new byline, changes dateline, previous LONDON)

London, July 25 (Reuters) - Oil rose around 3 percent on Tuesday, a day after U.S. oil producer Anadarko said it would cut capital spending plans and Saudi Arabia vowed to reduce crude exports to help curb global oversupply.

Brent crude futures rose $1.37 or 2.8 percent to $49.97 a barrel by 12:06 p.m. (1606 GMT). U.S. West Texas Intermediate futures rose $1.39 or 3 percent to $47.73 a barrel.

Lower oil prices in June and July may be affecting U.S. shale production, said Mark Watkins, regional investment manager at U.S. Bank.

"Companies are not drilling as fast they had been in the beginning of 2017," he said, "Theyre not producing as much because its much less profitable with prices in the low $40s."

On Monday, Anadarko Petroleum Corp posted a larger-than-expected quarterly loss and said it would cut its 2017 capital budget by $300 million because of depressed oil prices, the first major U.S. oil producer to do so.

Earlier, Halliburton's executive chairman said growth in North America's rig count was "showing signs of plateauing."

"In the U.S. investors have been waiting to see where that top is in oil production," Watkins said, "Weve hit a tension point."

At a meeting of the Organization of the Petroleum Exporting Countries (OPEC) and non-OPEC producers on Monday in St Petersburg, Russia, Saudi Arabian Energy Minister Khalid al-Falih said his country would limit crude exports to 6.6 million bpd in August, down almost 1 million bpd from a year earlier.

Nigeria agreed to join the deal by capping or cutting its output from 1.8 million bpd once it stabilizes at that level.

OPEC said stocks held by industrial nations had fallen by 90 million barrels in the first six months of the year but were still 250 million barrels above the five-year average, which is the target level for OPEC and non-OPEC members.

Market players will watch U.S. crude inventory data due Tuesday afternoon from the American Petroleum Institute and Wednesday morning from the U.S. Energy Information Administration. Analysts estimated, on average, that crude stocks fell 3 million barrels in the latest week.

"The general consensus around the campfire is that youre going to get sizeable draws in crude and gasoline," said Robert Yawger, director of energy futures at Mizuho Americas.

A weaker dollar is also supporting crude prices, Yawger said.

China's crude imports will exceed 8 million bpd this year and should grow by a double-digit percentage next year, a Sinopec Group executive said.

(Additional reporting by Ahmad Ghaddar in London, Osamu Tsukimori in Tokyo; editing by David Clarke and David Gregorio)