* IEA trims 2011 oil demand growth forecast by 50,000 bpd
* Front-month US crude strengthens relative to Brent, curve
* Enbridge pipe leak size, shutdown duration still unclear
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By Marie-Louise Gumuchian
LONDON, Sept 10 (Reuters) - U.S. crude rose more than $1 to over $75 on Friday due to the shutdown of a major pipeline, but a leading forecaster said demand would remain tepid.
The International Energy Agency said global oil demand growth was expected to increase a little this year but slip in 2011 and that fuel consumption could be much weaker if the world economy slows. [
]Front-month U.S. crude for delivery in October <CLc1> rose $1.43 to $75.68 a barrel at 1220 GMT after earlier approaching a three-week high near $76. It touched $75.96 on Thursday, the highest intraday price since Aug. 19.
The November contract <CLc2> added 90 cents to $76.69.
Brent crude <LCOc1> gained 12 cents to $77.59.
"What could become a game changer is the ... leak on the Enbrige pipeline because it comes on top of another disruption they had on another pipeline," Olivier Jakob of Petromatrix said.
A leak forced Enbridge to shut down the biggest pipeline supplying Canadian oil to refineries in the U.S. Midwest and to a key storage hub in Oklahoma.
Canada is the largest oil exporter to the U.S., and Enbridge's pipelines carry the lion's share of that crude.
Enbridge Inc <ENB.TO> closed its 670,000 barrel-per-day (bpd) Line 6A, the largest of the company's major three, after a leak was discovered near Romeoville, Illinois. The duct accounts for 7-8 percent of total U.S. crude imports. [
]Six weeks ago Enbridge was forced to shut down another smaller part of its Lakehead system, which the U.S. government has not yet allowed to resume operations following heightened scrutiny because of BP Plc's <BP.L> Gulf of Mexico spill.
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The market was little moved by the IEA figures, Jakob said, adding they were similar to those in last month's report.
The IEA said global oil supply was more than sufficient to meet demand, highlighting high levels of industry stocks across the developed world.
Record stockpiles in the United States have this month depressed the price of U.S. benchmark crude relative to European Brent <LCOc1>. The Enbridge pipeline shutdown might help ease a glut at the Cushing, Oklahoma, pricing point, which is chiefly supplied with Canadian oil.
Brent posted its biggest premium to WTI since mid-May earlier this week at more than $3.50 a barrel, shrinking on Friday to about $1.90.
"We don't know the timeline for when the leak is likely to be fixed. We're likely to see more draws in Cushing than was previously expected," Amrita Sen of Barclays Capital said. <^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Graphic of Enbridge system: http://link.reuters.com/qyz52p ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^>
Though the size of the Enbridge spill or the duration of the outage are not yet known, fire officials said the line was shut and the oil had been contained.
Storms are expected to cause losses of about 20 million more barrels of U.S. crude oil production in the Gulf of Mexico before the Atlantic hurricane season ends on Nov. 30, the Energy Information Administration said Thursday. [
]World stocks measured by MSCI All-Country World Index <.MIWD00000PUS> were up 0.02 percent. The dollar was down 0.07 percent against a basket of currencies. <.DXY> (Additional reporting by Alejandro Barbajosa in Singapore; editing by Alison Birrane and Jane Baird)