Crude stockpiles fell by 2.3 million barrels last week -- the ninth week in a row -- data from the US Department of Energy showed.
This helped offset a surprise rise in gasoline inventories over the summer -- traditionally the peak demand season for motor fuel.
At about 0330 GMT, US benchmark West Texas Intermediate was up 10 cents, or 0.22 per cent, to USD 45.85, while North Sea Brent crude was up 16 cents, or 0.34 per cent, to USD 47.33.
"In the short term, the markets will focus on the interest rate decision by the European Central Bank and trading statistics from Japan."
Also Read
The ECB is expected to make an announcement today on whether it will raise interest rates.
Markets have gone on the upturn on expectation of fresh stimulus, led chiefly by news that Japanese Prime Minister Shinzo Abe is eyeing a plan worth at least 20 trillion yen, the Kyodo News agency said.
Crude prices have fluctuated between USD 44 and USD 52 per barrel in the past month, after falling below USD 30 in February on the back of the world supply glut and weak demand.
Supply disruptions that lifted prices from near 13-year lows in February have eased and the situation in Turkey is stabilising after the weekend's failed coup attempt, turning attention back to the supply issue.