Iran's Opec envoy is reported as saying it is "illogical" for it to join the oil output freeze agreed by a Russian and Saudi Arabian-led group on Tuesday.
Mehdi Asali, quoted in the Iranian newspaper, Shargh, said Iran will continue to increase oil production until it reaches pre-sanction levels.
Venezuela's oil minister is holding talks in Tehran to broker a deal with Iran and Iraq on Wednesday.
Iran has only just restarted oil exports after sanctions were lifted.
The move by four countries, including Venezuela and Qatar, is the first of its kind in 15 years.
It is designed to reflate oil prices, which have sunk by about 70% from their recent peak of $116 in June 2014 thanks to oversupply as the global economy slows down.
The plan though failed to convince oil traders.
The "freeze" in output at January levels simply allows oil producers to continue pumping at record levels. Read more...
