* U.S. energy department data confirms big crude stock build
* NYMEX crude futures initially fall $2 then recoup partly
* Investors looking to EU summit Thursday
* Dollar gains after Fitch cuts Portugal rating
(Releads after EIA report, updates prices)
By Jo Winterbottom
LONDON, March 24 (Reuters) - Oil quickly slid $2 a barrel to under $80 on Wednesday after U.S. energy department data confirmed a rise in crude stocks that surpassed expectations, but gasoline demand figures helped stem the price decline.
Sentiment was also undermined earlier by concerns over the fragility of a global recovery as Portugal's sovereign credit rating was downgraded, underlining worries Greece's debt problems could move to other euro zone areas. [
]U.S. crude oil futures for May <CLc1> touched a low of $79.88 a barrel and by 1445 GMT were trading down $1.28 at $80.63. Crude futures have traded between $69 and $84 so far this year. London ICE Brent <LCOc1> for May was down $1.13 at $79.57 after earlier dipping to a low of $78.90.
U.S. crude stockpiles jumped 7.3 million barrels in the week ended March 19, the U.S. Energy Information Administration (EIA) said, broadly confirming a 7.5 million barrel build reported by the American Petroleum Institute (API) on Tuesday. <API/S> <EIA/S>
"The EIA data essentially mirrors that of API, with gasoline being the exception. Larger-than-expected builds in crude oil reduced prices, not to ashes, but to $80," said Jay Levine of Enerjay LLC, based in Portland, Maine.
Brad Samples at Summit Energy said the build mostly came from imports and refineries could process more oil as the U.S. driving season got underway.
"The big build all comes from imports, which rose to their highest level since September, 2009," he said.
"Refinery utilization rates have been rising along with import levels, and the rise will probably continue as we head toward the (U.S.) driving season. We've been eating away at gasoline stocks," he added.
The EIA said gasoline stocks fell 2.7 million barrels in the week ending March 19, more than the 1.3 million forecast in a Reuters poll of analysts.
AT HOME IN THE RANGE?
But Mike Zarembski at Optionsxpress in Chicago said the market was watching the dollar and European economies and was unable to take a fundamental spur to break out of current ranges.
"The market is so entrenched in this trading range -- $77.50 on the downside and $83.50 on the upside -- that no one is really interested in taking a position either way. Traders have their minds on other markets such as the U.S. dollar and the whole European quagmire," he said.
The dollar rose against the euro after Fitch Ratings cut Portugal's sovereign credit rating by one notch to AA- in a move which put further pressure on the single currency. [
]Data in the euro zone painted a mixed picture on the economy, with manufacturing activity growing in March at its highest level since the end of 2006 [
] but industrial orders in January falling, underscoring the fragility of the economic recovery. [ ]Still, analysts believe the fluctuations in the dollar will likely have less impact on crude oil prices as fundamental concerns come more sharply into focus.
Petromatrix analysts said they would look to the gasoline crack -- the theoretical premium refiners get for making gasoline from crude -- for crude price indications this week.
The gasoline crack <RB-CL1=R> touched a high for 2010 around $14.60 earlier this week and is now just under $13. Demand often rises going into the U.S. summer as drivers take off on holiday.
"With plenty of stocks and relative values that are favouring (making gasoline), the U.S. consumer will have to drive a long way before putting the supply capacity at risk," said Petromatrix in a report. (Editing by Amanda Cooper)