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OPEC was trying on Monday to rescue a deal to limit oil output as tensions grew among the producer group and non-OPEC member Russia, with top exporter Saudi Arabia saying markets would rebalance even without an agreement.
OPEC experts started a meeting in Vienna at 0900 GMT and were due to make recommendations to their ministers on how exactly the Organization of the Petroleum Exporting Countries should reduce production when it meets on Nov. 30.
Meanwhile, the Algerian and Venezuelan oil ministers were to travel to Moscow on Monday and Tuesday in a final attempt to persuade Russia to take part in cuts instead of merely freezing output, which has reached new highs in the past year.
In September, OPEC, which accounts for a third of global oil production, agreed to cap output at around 32.5-33.0 million barrels per day versus the current 33.64 million bpd to prop up oil prices, which have more than halved since mid-2014.
But doubts emerged in recent weeks as OPEC's No.2 and 3 producers, Iraq and Iran, expressed reservations about the mechanics of output reductions and Saudi Arabia voiced concern about Russia's willingness to cut.
Over the weekend, Saudi Energy Minister Khalid al-Falih said oil markets would rebalance even without an output-limiting pact. That contrasted with his previous statements, in which he had said Riyadh was keen for a deal.
Doubts about OPEC's ability to deliver promised cuts sent Brent crude down 2 percent initially on Monday to less than $47 per barrel, though prices later recovered. [O/R]
Some analysts including Morgan Stanley and Macquarie have said oil prices will correct sharply if OPEC fails to reach a deal, potentially going as low as $35 per barrel.
As OPEC experts turned up at the group's headquarters on Monday, one delegate who had previously stated that a deal would be done, said this time: "I am not sure."
Another delegate, when asked about the prospects for a deal, said: "Nobody knows yet".
OPEC ministers started arriving in Vienna on Sunday for the group's regular twice-yearly talks but Saudi Arabia's Falih was not expected to land before Tuesday evening, leaving little time for traditional pre-meeting discussions with peers.
Iranian semi-official news agency MEHR published an editorial on Sunday accusing Saudi Arabia of declaring a new "war on oil prices" and reneging on its promises to limit output.
The tone contrasted with Iranian news agencies' more upbeat coverage of OPEC's informal meeting in September in Algeria, when the initial deal was reached.