(Updates prices; adds Brent and details)
By Felicia Loo
SINGAPORE, April 22 (Reuters) - Oil held above $117 a barrel on Tuesday, just shy of its all-time high, as geopolitical risks stoked fears of supply worries at a time of robust Chinese crude demand.
U.S. light crude for May delivery <CLc1> dipped 17 cents to $117.31 a barrel by 0642 GMT, after prices hit an all-time peak of $117.83 on Monday.
London Brent crude <LCOc1> dropped 3 cents to $114.40 a barrel.
"Again there are some concerns over supply disruptions in Nigeria," said David Moore, commodities strategist at Commonwealth Bank of Australia.
Pipeline attacks in OPEC member Nigeria last week shut 169,000 barrels per day (bpd) of Bonny Light production, forcing Royal Dutch Shell Plc <RDSa.L> to declare force majeure on crude oil exports. [
]Nigerian rebels also attacked two Shell oil pipelines in the Niger Delta on Monday after the raid last week in what they called an act of defiance against major consumer the United States, the world's top energy consumer. [
]Crude imports to China, the No. 2 oil user, surged a quarter from a year ago to 4.07 million bpd in March, far above previous records, customs data showed on Tuesday.
China also more than quadrupled March diesel imports to 494,192 tonnes and gasoline exports tumbled 84 percent to 101,319 tonnes in the same period, as state oil firms rushed to stock up oil ahead of the summer Olympics. [
]Chinese implied oil demand -- net imports plus refinery output but excluding inventory changes that are not reported -- grew 8.1 percent in March from a year earlier, the highest rate for 19 months. [
]Sparking supply worries, the Grangemouth refinery in Scotland has begun shutting down ahead of a two-day strike due to start on Sunday. Some North Sea oil and natural gas output will have to be shut in if the union halts the refinery.
But OPEC officials reiterated that the market had enough oil and the producer group would not ramp up output to help bring down prices despite calls for more oil from some consumer nations.
Iranian oil minister Gholamhossein Nozari said oil prices were not too high in real terms, even as U.S. pump prices hit a new record as the world's top consumer gears up for the summer driving season.
Though the rise in fuel costs has added pressure to the struggling U.S. economy, Energy Secretary Sam Bodman on Monday said he did not favour tapping emergency reserves to help bring down oil prices.
The weak U.S. dollar has also contributed to oil's rally, devaluing assets in the U.S. currency and pushing investors to shift part of their money to commodities and oil.
A Reuters poll of analysts ahead of weekly government inventory data to be released on Wednesday forecast U.S. crude stocks fell 1.8 million barrels in the week to April 18, a 2.3-million-barrel drop in gasoline supplies and a 100,000-barrel draw in distillate stocks. (Editing by Ben Tan)