New York's main contract, light sweet crude for delivery in June added 15 cents to USD 96.86 a barrel and Brent North Sea crude for July delivery increased 15 cents to USD 104.95 in mid-morning trade.
Bernanke will appear tomorrow before Congress' Joint Economic Committee to give an update on the latest outlook for the world's biggest economy and largest oil consuming nation.
Global markets will also closely watch his statements for an indication on when the Fed, the US central bank, will start winding down its massive bond-buying programme to boost the economy.
"Crude bulls tried to push prices higher, but high stocks of the fuel tapered gains," Phillip Futures said in a market commentary.
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Michael McCarthy, chief market strategist at CMC Markets in Sydney, told AFP that dealers were waiting for the latest energy inventory report due tomorrow from the United States, where stockpiles have outpaced demand.
"Nothing has really changed in the global picture of demand," McCarthy said.
Oil prices had surged last week after a better-than-expected reading on US consumer confidence boosted hopes for stronger energy demand.