Oil prices fell 4 percent on Thursday to their lowest since mid-June, extending the previous day's sharp decline on the potential impact renewed coronavirus lockdowns will have on oil demand.
December Brent crude futures were down $1.52, or 3.9 percent, at $37.60 by 1029 GMT. The more active January contract lost $1.48 a barrel to $38.16.
U.S. West Texas Intermediate (WTI) crude futures fell $1.52, or 4.1 percent, to $35.87.
Both contracts plunged by more than 5 percent on Wednesday.
With COVID-19 cases surging across Europe, France will require people to stay at home for all but essential activities from Friday, while Germany will shut bars, restaurants, and theatres from Nov. 2 until the end of the month.
"As lockdowns begin to bite on demand concerns across Europe, the near-term outlook for crude starts to deteriorate," said Stephen Innes, chief global market strategist at Axi.
The Organization of the Petroleum Exporting Countries (OPEC) and its allies will closely monitor the deteriorating demand outlook.
OPEC and its allies, together known as OPEC+, plan on tapering production cuts in January 2021 from a current 7.7 million barrels per day (bpd) to about 5.7 million bpd.
OPEC+ is scheduled to meet on Nov. 30 and Dec. 1 to set a policy.
Rising Libyan oil production is also weighing on sentiment. The OPEC member expects production to reach 1 million bpd in the next few weeks, doubling from levels earlier this month.
Oil had initially rebounded slightly from overnight losses in Asian morning trade on technical support and the prospect of tighter short-term supply as Hurricane Zeta slams Louisiana.
But the hurricane is forecast to weaken by Thursday morning in the United States, and the return of U.S. production will add to the existing oversupply.
(Additional reporting by Shu Zhang and Sonali Paul; Editing by David Goodman)