BENGALURU: Oil prices were up marginally in a volatile session on Thursday, after a surprise build in US crude stocks dampened some optimism around rising Chinese demand and lower Russian supplies.

Brent crude futures rose 61 cents, or 0.7%, to $85.59 a barrel at 11:43 a.m. EST (1643 GMT) US West Texas Intermediate (WTI) crude rose 39 cents, or 0.5%, to $79.87 a barrel.

Prices were down by more than a dollar per barrel earlier in Thursday’s session, continuing to slide from Wednesday as traders booked profits and US data showed the economy losing momentum. Both contracts had hit their highest since Dec. 5 on Tuesday.

US crude stocks gained last week by the most since June 2021, rising by 8.4 million barrels, according to the US Energy Information Administration (EIA).

Still, the report was better than a week ago, as it showed a recovery of implied oil demand and refinery runs from the impact of Storm Elliott, said UBS analyst Giovanni Staunovo.

US gasoline refining margins traded at a new five-month high for the fourth-straight session on Thursday, amid optimism around rising travel demand from China’s reopening and threats to refined products supply from strikes across France.

“Gasoline demand was up big for winter,” said Mizuho analyst Robert Yawger.

“It was warm in much of the country so people were driving around much more than they were. People are getting out instead of hiding indoors,” Yawger said.

IEA head, Fatih Birol, said on Thursday that energy markets could be tighter in 2023, adding that he hoped prices would not rise further to ease pressure on energy-importing developing countries.

“Looking a bit longer term, I believe Russia’s oil industry will face huge challenges,” Birol said at the World Economic Forum in Davos.

“If (the) Chinese economy rebounds this year, which many financial institutions expect, then we may see very strong demand.