After Saudi Arabia and Russia pledged to cut their output through September, crude oil prices made slight gains in trading on Thursday.
West Texas Intermediate, the U.S. benchmark, rose 31 cents to close at $81.86 a barrel on the New York Mercantile Exchange.
Global benchmark Brent crude finished up 34 cents at $85.48 a barrel on ICE Futures Europe.
Both were on track for a sixth week of gains after the pledges made by Saudi Arabia and Russia. They were also set for their longest streak of weekly gains this year reported Reuters. WTI has risen 18.2% over the last six weeks while Brent crude gained 15.4%.
September natural gas rose 9 cents to $2.57 per 1,000 cubic feet.