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UPDATE 6-Oil up as U.S. rigs and refineries brace for hurricane

* Concerns hurricane could disrupt U.S. supplies

* Refinery closures trigger gasoline price jump

* OPEC/non-OPEC producers mull extension of output cut (Updates prices in paragraph 4)

LONDON, Aug 25 (Reuters) - Oil prices rose on Friday as the U.S. petroleum industry braced for Hurricane Harvey, which may become the biggest storm to hit the U.S. mainland in more than a decade.

Harvey became a category 2 storm as it crossed the Gulf of Mexico with winds of 105 mph (169 kph), 220 miles (355 km) off Corpus Christi, Texas, the National Hurricane Center said.

The hurricane is forecast to make landfall late Friday or early Saturday between Corpus Christi and Houston, both important oil refining centers.

U.S. light crude, also known as West Texas Intermediate or WTI, was up 30 cents at $47.73 a barrel by 1015 GMT. Brent crude was 30 cents higher at $52.34.

Energy companies have pulled workers from offshore oil platforms and halted onshore drilling in south Texas.

Just under 10 percent of offshore U.S. Gulf of Mexico crude output capacity and nearly 15 percent of natural gas production had been halted by midday on Thursday, government data showed.

"Damage and flooding to refineries and shale fields, disrupted production in the Gulf of Mexico and infrastructure damage are unlikely to be bearish for WTI," said Jeffrey Halley, market analyst at brokerage OANDA.

U.S. gasoline prices have risen almost 10 percent since Wednesday to a high of $1.74 a gallon, their loftiest since April as refiners shut down in preparation for the storm.

The Port of Corpus Christi, Texas, was closed to vessel traffic, a spokeswoman for the city's Port Authority said.

Oil refineries in the city run by Citgo Petroleum, Valero Energy Corp and Flint Hills Resources also began shutting down.

Beyond the storm's potential impact on the oil industry, crude remains in ample supply globally despite efforts led by the Organization of the Petroleum Exporting Countries to hold back production in order to prop up prices.

OPEC, together with non-OPEC producers including Russia, has pledged to cut output by 1.8 million barrels per day (bpd) this year and in the first quarter of 2018. But not all producers have kept to their pledges and supplies remain high.

A joint OPEC, non-OPEC monitoring ministerial committee said on Thursday that an extension to the supply-cut pact beyond March was possible, though not yet decided.

Part of the reason for the crude glut has been rising U.S. production, which has jumped by 13 percent since mid-2016 to 9.53 million bpd, close to its 9.61 million bpd record from June 2015. <C-OUT-T-EIA>

(Additional reporting by Henning Gloystein in Singapore; Editing by Mark Potter and Dale Hudson)