A weakening of the dollar on the back of worse-than-expected U.S. labor market data on Friday also boosted the appeal of commodities priced in the currency.

The U.S. benchmark posted a seventh straight weekly gain, the longest stretch of advances since December. The economic recovery from the pandemic, along with supply disruptions in the U.S. Gulf of Mexico, had already tightened the market before rising natural gas prices spurred additional demand for oil products like diesel and fuel oil. The decision by OPEC producers and their allies to only modestly increase output in November threatens to further constrain supplies.

Meanwhile, various underlying oil market gauges are also showing signs of strength. West Texas Intermediate crude’s nearest contract traded at the biggest premium to second-month futures since August in a sign of rising demand and tight supplies. The so-called prompt spread has increased as more of the world attempts to substitute fuel oil for natural gas as quickly as possible.  “They don’t need to buy it a month from now, they needed it yesterday,” said Bob Yawger, director of the futures division at Mizuho Securities USA. “It’s a panic buyer’s situation.”

Meanwhile, China is still facing power outages and Beijing has ordered its state-owned firms to secure energy supplies for winter at all costs. Chinese fuel oil futures jumped almost 10% on Friday as local markets resumed after a week-long national holiday.