* About 25 percent of Libyan oil output shut
* Worries persist over Mideast, North Africa outages
* Coming up: API crude inventory data at 2130 GMT (Recasts, updates prices, market activity to settlement.)
By Joshua Schneyer
NEW YORK, Feb 23 (Reuters) - U.S. crude jumped to a 28-month high above $100 a barrel on Wednesday, as investors weighed the risk of Middle East unrest spreading from Libya to bigger exporters including Saudi Arabia.
U.S. crude for April delivery <CLc1> rose 2.8 percent to settle at $98.10 after soaring as high as $100 earlier.
Brent <LCOJ1>, which has posted the biggest three-day gain since October 2009, rose 5.3 percent to settle at $111.25. It was Brent's highest settlement since August, 2008, shortly before the collapse of U.S. investment bank Lehman Brothers. [
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The rise of US crude prices:
http://link.reuters.com/byv28r
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A lethal political standoff between Libyan strongman Muammar Gaddafi and rebel factions now in control of oil-rich eastern Libya has already cut output in the world's No. 12 crude exporter by more than 25 percent, or 400,000 barrels a day, according to Reuters calculations. [
]Oil's surge above $100 helped fed worries about the impact of costly energy prices on the U.S. economy, dragging U.S. equities markets lower. In 2008, crude's advance to a record $147 a barrel cut demand and contributed to the deepest global economic downturn since World War Two. [
]U.S. oil prices seesawed in a range as wide as $5 a barrel as traders mulled whether popular revolts sweeping across North Africa could spread to big crude exporters like Saudi Arabia.
"Oil prices are not likely to fall any time soon," said Shelley Goldberg, commodities and energy strategist at Roubini Global Economics in New York.
"It's not all about Libya, but a fear these movements will spread further across the Middle East and North Africa region. We're no longer in the early stages of uprisings, but we're probably somewhere in the middle stages, with more ahead."
The possibility that protests could expand in Bahrain or potentially into neighboring Saudi Arabia, OPEC's top oil exporter, helped push prices higher.
While the kingdom has faced no tumult to date, hundreds of people on Wednesday backed a Facebook page campaigning for a "day of rage" across Saudi Arabia next month. [
]"Saudi Arabia is nervous about potential opposition too and the market senses that," said Gene McGillian of Tradition Energy in Connecticut.
SAUDI ARABIA'S NEXT MOVE
Traders were also watching for signals that Saudi Arabia, which controls much of global spare production capacity, would pump more oil to compensate for Libya's lost output. Its oil minister has said the kingdom and other OPEC members would be ready to act should any shortfall develop. [
]"It is imperative the Saudis release some extra barrels into the market now to calm the situation, rather than simply trying to talk the price down," said Edward Meir, an analyst at MF Global in New York.
Many analysts also expected Libya's violence to take a heavy toll on the North African country's oil output, potentially crimping exports for months or years. [
]BRENT SPREAD WIDENS
Brent traded at a $13.23 a barrel advantage to U.S. WTI post-settlement, widening from a $10.85 gap on Tuesday, as traders bet Middle East unrest would crimp European oil supply. Libyan exports usually feed a quarter of Italy's oil demand.
However, the spread has narrowed sharply from a record $16.51 hit on Feb. 17.
U.S. crude rallied through a long-term uptrend resistance, on course for the biggest weekly gain since the financial crisis. (Graphic http://link.reuters.com/cyv28r )
Traders geared up for U.S. weekly inventory data, the first of which will be released by the industry group American Petroleum Institute later on Wednesday at 4:30 p.m. EST (2130 GMT).
A Reuters poll forecast that U.S. crude stockpiles rose 1.3 million barrels last week, while distillate inventories fell 1.4 million barrels and gasoline supplies rose 400,000 barrels. [
] (Additional reporting by David Sheppard and Gene Ramos in New York; Zaida Espana in London, Francis Kan in Singapore; Editing by Walter Bagley and David Gregorio)