Oil prices have fallen and posted the worst monthly performance since mid-2016 on evidence of rising global crude supply, but losses were limited by signs of strong US demand for fuel.
The Brent crude December futures contract, which expired Wednesday, fell 44 cents to settle at $US75.47 a barrel.
The more-active January contract fell 91 cents to settle at $US75.04 a barrel.
West Texas Intermediate crude futures fell 87 cents to settle at $US65.31 a barrel.
Both benchmarks were more than $US10 a barrel below the four-year highs reached on October 3.
They both posted their worst monthly performance since July 2016, with Brent falling 8.8 per cent for the month and WTI dropping 10.9 per cent.
Investor sentiment across risky asset classes, such as equities and energy, turned negative during the month as US-China trade tensions sparked demand worries.
Weighing on market sentiment on Wednesday were signs of rising global output.
US crude oil production surged by 416,000 barrels per day to a record 11.346 million bpd in August, the US Energy Information Administration said.
The United States and other top producers Russia and Saudi Arabia pumped 33 million barrels per day in September, Refinitiv data showed, an increase of 10 million bpd since the start of the decade.
Russian oil output has reached 11.41 million bpd in October, a level unseen since the collapse of the Soviet Union in 1991, an industry source told Reuters.
The increases in production comes just ahead of new US sanctions on Iran, set to come into force November 4, that are expected to cut supply.
‘There’s this perception that there’s enough oil in the market right now to get through the Iranian sanctions,’ said Phil Flynn, analyst at Price Futures Group in Chicago.
Washington has made it clear to Tehran’s customers that it expects them to stop buying any Iranian crude oil from that date.
However, on Wednesday US national security adviser John Bolton said that while the United States wants to apply maximum pressure on Iran with sanctions on its crude exports, it does not want to harm countries that are friends and allies that depend on the oil.
Imports of Iranian crude by major buyers in Asia hit a 32-month low in September as China, South Korea and Japan sharply cut their purchases ahead of the sanctions, government and ship-tracking data showed.
Earlier in the session, oil prices gained after the US Energy Information Administration said crude inventories rose 3.2 million barrels last week, less than expected.
Petrol and distillate stockpiles fell as total product demand over the past four weeks rose 5.4 per cent from a year ago.
‘Bullish draws to the products have acted as a counterweight to bearish sentiment,’ said Matt Smith, director of commodity research at ClipperData.
Oil market sentiment received some support from equity markets, which pulled back from 20-month lows after pledges by China to support its markets.
Equities have been under pressure from the trade war between the world’s two largest economies, the United States and China.
The United States has imposed tariffs on $250 billion worth of Chinese goods and China has responded with retaliatory duties on $110 billion worth of US goods.