Traders are still concerned about the possibilities that Iran's oil exports
World oil prices inched up Wednesday, amid worries about supply in Nigeria and Iran.
US light sweet crude for delivery in April, advanced 56 cents to settle to $61.97 per barrel.
In London, Brent crude futures for April delivery rose 69 cents to $62.45 per barrel on the IPE.
In Nigeria, some 455,000 bpd of its oil production- about one-fifth of the country's daily output, or less than 1 percent of total global demand, is still shut after a series of militant attacks. Nigeria is Africa's leading oil producer and the fifth-biggest source of U.S. oil imports.
Traders are still concerned about the possibilities that Iran's oil exports would halt if the United Nations imposes Teheran an international sanction for its nuclear activities.