Singapore - Crude prices rose in Asian trade Thursday due to continued concern about unrest in Libya and the Middle East.
New York's main contract, light sweet crude for April delivery, rose 46 cents to $104.84 per barrel.
Brent North Sea crude for April rose 26 cents to $116.20.
"It is the fear of the spread of turmoil to other Middle Eastern countries that is fuelling the further increase in prices," said Ong Yi Ling, investment analyst for Phillip Futures in Singapore.
She said there was enough supply from the Organisation of Petroleum Exporting Countries and there was no need for the oil cartel to hold an emergency meeting before their scheduled session in June.
Oil prices have breached the psychological level of $100 a barrel on fears the unrest that has already toppled the leaders of Tunisia and Egypt will disrupt supplies.
While levels are still below the all-time high of more than $147 a barrel reached in 2008, soaring oil prices have sparked fears of higher inflation that could dent growth as the global economy firms up its recovery from the 2008-2009 recession.
In Libya, a string of oil facilities in rebel-occupied Ras Lanuf was bombed by forces loyal to Moamer Kadhafi on Wednesday.
The head of Libya's state oil firm insisted the damage to infrastructure was minor but acknowledged that oil output was down more than two-thirds.
Analysts were also looking ahead to possible protests in Opec lynch pin Saudi Arabia on Friday.
Western powers are pondering a range of options to resolve the crisis in oil-producer Libya, including prospects for military intervention via a no-fly zone and humanitarian aid.
"The focus is on whether the crisis in the Middle East will be resolved or continue," said Ong.