* Alaska oil pipeline restarts after Jan. 8 leak
* Dollar stronger, euro weakens <.DXY>
* NYMEX-Brent spread narrows after hitting 23-month high
* OPEC says market well supplied, sees higher inventories
* Trading volume one-half norm due to U.S. holiday (Recasts with Alaska pipeline, updates prices throughout)
By Claire Milhench and Jonathan Leff
LONDON/NEW YORK, Jan 17 (Reuters) - Oil slipped on Monday after the dollar strengthened and a major Alaskan oil pipeline resumed full operations after more than a week, while an OPEC report said the market remained well supplied.
Prices fell by more than 0.5 percent, their biggest one-day drop since before a leak forced the temporary closure of the 640,000 barrel per day (bpd) Trans Alaska Pipeline System on Jan. 8, helping drive Brent crude to nearly $100 a barrel for the first time since October 2008 amidst the financial crisis.
The operator of the 800-mile (1,280-km) line restarted the line on Monday and said it should reach 500,000 bpd within 24 hours. [
]"We are seeing the end of exceptional support due to supply disruption on this pipe, and also the weather has become much warmer than usual both in Europe and in parts of central and eastern United States. So we are losing some support from cold temperatures," said Christophe Barret, oil analyst at French bank Credit Agricole.
U.S. crude for February <CLc1>, which only traded electronically due to the Martin Luther King U.S. public holiday, deepened earlier losses to fall by 52 cents to $91.02 a barrel by 3:05 EST. ICE Brent <LCOc1> for March dropped 92 cents to $97.46, although trade volume was only half its norm.
The spread between the two futures contracts has narrowed since the ICE Brent contract for February expired on Friday. At one point on Friday, the spread between the two February contracts hit more than $8.00 a barrel, its widest in 23 months.
OPEC UNFAZED
In its monthly report on market conditions, OPEC maintained its view that consumers have enough oil, blaming the run-up in prices on the early onset of winter weather and an increase in investment flows into commodities.
The Organization of the Petroleum Exporting Countries increased its global oil demand growth forecast by 50,000 barrels per day (bpd) to 1.23 million bpd in 2011, and said the world oil market remained well supplied and inventories should build in the first half of the year. [
]The UAE's oil minister said fluctuating prices were not a worry: "The price keeps going up and down and all I can say for now is that we are happy," Mohammed al-Hamli told reporters.
Al Hamli said markets were well supplied and prices reflected market conditions. [
] [ ]But the head of the International Energy Agency, Nobua Tanaka, said on Monday oil prices were alarming at current levels and would have a negative impact.
OPEC Secretary General Abdullah al-Badri told an Austrian newspaper that, while the organization was ready to act to address supply shortages in the oil market, it would not intervene if prices were driven by speculation. [
].At this stage, higher output would not stem a rise in oil prices, as the climb is driven by increasing demand in emerging countries, chief executive of French oil major Total <TOTF.PA> Christophe de Margerie told Reuters on Sunday. [
]Oil prices were also undermined on Monday by modest gains in the U.S. dollar and weakness in equity markets, particularly China, where the the benchmark Shanghai Composite Index <
> closed down more than 3 percent. [ ] (Additional reporting by Seng Li Peng in Singapore and Christopher Johnson in London; editing by Anthony Barker and Martin Golan)