Iranian Oil Minister Bijan Zanganeh said earlier: "It is not the time for decision-making." Referring to the next formal Opec meeting in Vienna on November 30, he added: "We will try to reach agreement for November." The Organisation of the Petroleum Exporting Countries will hold informal talks at 1400 GMT on Wednesday. Its members are also meeting non-Opec producers on the sidelines of the International Energy Forum, which groups producers and consumers.
Oil prices have more than halved from 2014 levels due to oversupply, prompting Opec producers and rival Russia to seek a market rebalancing that would boost revenues from oil exports and help their crippled budgets. The predominant idea since early 2016 among producers has been to agree to freeze output levels, although market watchers have said such a move would fail to reduce unwanted barrels.
A deal has also been complicated by acute political rivalry between Iran and Saudi Arabia, which are fighting several proxy-wars in the Middle East, including in Syria and Yemen. Sources told Reuters last week that Saudi Arabia had offered to reduce its output if Iran agreed to freeze production, a shift in Riyadh's position as the kingdom had previously refused to discuss output cuts.
On Tuesday, several Opec delegates said the positions of Saudi Arabia and Iran remained too far apart. Oil prices were down more than 3 percent by 1802 GMT. "There is a move forward, but they (Opec) haven't got to the finish," Russian Energy Minister Alexander Novak said after meeting Falih and Zanganeh. Novak and Falih said a deal was still possible later this year.
Three Opec sources said Iran, whose production has stagnated at 3.6 million barrels per day, insisted on having the right to ramp up to around 4.1-4.2 million bpd, while Opec Gulf members wanted its output to be frozen below 4 million. Several Opec sources said Iran effectively rejected the offer despite last-minute attempts by Russia, Algeria and Qatar to rescue a deal.
The Saudi and Iranian economies depend heavily on oil, but Iran is seeing the pressure easing as it emerges from years of sanctions. Riyadh, on the other hand, faces a second year of record budget deficits and is being forced to cut the salaries of government employees. Iranian oil sources said Tehran wanted Opec to allow it to produce 12.7 percent of the group's output, equal to what it was extracting before 2012, when the European Union imposed additional sanctions on the country for its nuclear activities. Sanctions were eased in January 2016.