U.S. crude inventories rose by 10.5 million barrels to 450 million
barrels in the week to March 13, American Petroleum Institute (API)
figures showed on Tuesday.
Analysts had expected a 3.8-million-barrel increase.
Brent for May delivery was down 62 cents at $52.89 per barrel
by 1058 GMT after ending the previous session up 7 cents.
U.S. crude for April delivery fell $1.25 to $42.21 per barrel, after
hitting a six-year low of $42.05 earlier in the session.
Crude stocks at the Cushing, Oklahoma delivery hub rose by 3 million
barrels, the API said.
"That's a big build, especially given the rate of inventory
increases we've seen recently," said Dominic Haywood, oil analyst at
Energy Aspects.
"If we continue at this pace, there's definitely potential to see
storage hitting tank tops at Cushing in April or May."
Official inventory data will be issued on Wednesday by the U.S.
government's Energy Information Administration (EIA).
"Whether the API data is right or wrong, it is still about market
expectations or missed expectations," said Ben LeBrun, a market
analyst at Sydney's OptionsXpress.
The expiry of the Brent contract on Monday and the West Texas
Intermediate forward contract on March 20 "is adding a bit of fuel,
adding to volatility in the market", LeBrun said.
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Traders on Wednesday are also watching for the U.S. Federal Reserve
to outline monetary policy objectives including regarding interest
rates.
"If U.S. interest rate hikes would be pushed back, this would likely
cause the dollar to weaken, however, only in the short run,"
Singapore's Phillip Futures said in a research note.
Global oversupply concerns have been spurred by factors including
U.S. output levels, some recovery in Libya's production and the
potential for a boost in Iran's exports should Western sanctions be
lifted.
There could also be more downward pressure on prices as China pauses
its build-up of strategic reserves and Asian refineries slow imports
ahead of spring maintenance.
(Additional reporting by Keith Wallis and Jessica Jaganathan in
Singapore; Editing by Jason Neely and Dale Hudson)
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