LONDON--Crude-oil futures were down again Friday as there are still few signs that producers are going to cut back even as global growth is proving to be weaker than many had expected.

Global oil prices have been falling on a combination of factors including high U.S. oil production, a surge in Libyan oil output, a seasonal peak in refinery maintenance and weak demand from Asia and Europe.

On the New York Mercantile Exchange, light, sweet crude futures for delivery in November traded at $84.56 a barrel early in the European day, down $1.21 in the Globex electronic session. November Brent crude on London's ICE Futures exchange fell $0.88 to $89.17 a barrel.

Friday, the Organization of the Petroleum Exporting Countries, which represents some of the world's largest oil producers, reported that the average oil price of its members has fallen to the lowest level since December 2010, just before a string of Arab uprisings pushed oil prices above $100 a barrel. The news underscores the pain faced by OPEC members, most of whom need higher prices to balance their budgets.

The organization said the average price of its members' crudes basket stood at $88.27 a barrel, compared with $88.32 the previous day. Those levels hadn't been touched since Dec. 13, 2010. OPEC's basket price has now fallen lower than the Brent international benchmark, though the latter also fell below $90 a barrel Thursday, the first time that has happened since 2012.

Later Friday, OPEC will publish its monthly production report, and investors will be watching to see whether there is any sign that OPEC members are cutting back production to prop up prices.

"In all probability no significant production cut is expected," said Tamas Varga of crude oil broker PVM. "The lack of a significant cut will be another nail in the bulls' coffin."

Meanwhile, some technical factors are also coming into play.

For Brent crude a large quantity of put options were in the market at the $90 mark, amounting to around 50 million barrels of oil equivalent in terms of contracts, which is a very large position, Mark Keenan, Singapore-based commodities strategist at Société Générale GLE.FR -0.90% said. A put option allows investors to sell an asset when a specific price level is reached.

As prices breached key levels, the volatility and weakness in prices has been amplified, he said. Previous price support levels were seen at the $100 a barrel mark, then at $95 and last at $90 a barrel, Mr. Keenan added. These levels are also called psychological price markers as investors tend to buy or sell in large numbers when these markers are crossed.

A recent surge in the U.S. dollar, which pressured commodities markets across the board, have also weighed on oil prices.

Mr. Keenan said if lower oil prices force marginal shale oil producers in the U.S. to lose money, it would also help establish a price floor.

"Generally speaking we do see prices recovering towards the end of the year as the Atlantic basin glut dissipates and seasonal winter demand starts to increase," he said.

"We have revised downwards our Brent and WTI price forecasts for the fourth quarter and for 2015," Barclays analyst Michael Cohen said in a report.

The bank now expects Brent to average $93 a barrel in the fourth quarter and $96 a barrel in 2015, down from $106 a barrel and $107 a barrel, respectively.

ICE gas oil for October was down $1.22, at $754.00 a metric ton. Gasoline was down 345 points at $2.2402 a gallon.

Benoît Faucon contributed to this article

Write to Matthew Cowley at matthew.cowley@wsj.com and Eric Yep at eric.yep@wsj.com

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