Oil prices diverged Thursday, with Brent rising after a power outage closed the UK's largest oilfield and following data showing a fall in crude inventories and strong demand from refineries in the United States.
Meanwhile, U.S. crude futures came under pressure, with traders citing a report by research firm Genscape that forecast inventory builds at the Cushing, Oklahoma delivery point for benchmark West Texas Intermediate.
Britain's Buzzard oilfield, the most important source of crude oil underpinning the global benchmark Brent, was closed after power supplies failed, traders said.
It normally pumps 170,000 to 180,000 barrels per day (bpd) but went down in the early hours of Thursday, traders said.
A spokeswoman for Buzzard operator Nexen, a unit of China's CNOOC, declined to comment.
"There was a trip last night," said one crude oil trader, who declined to be identified.