The new signs of discord sent oil prices sliding again on world markets in the face of a global supply glut that has left a gaping hole in the finances of oil-exporting nations.
US benchmark West Texas Intermediate for delivery in November fell 3.5 per cent to USD 44.31 a barrel in New York trade today.
Brent North Sea crude for November shed 3.4 per cent to USD 45.75 a barrel.
OPEC kingpin Saudi Arabia has so far refused to curb its output at a time when Iran is ramping up production following the lifting of nuclear-related sanctions.
More From This Section
"It's not in our agenda to reach an agreement in two days. We need time for more consultation," he told reporters on the sidelines of an energy conference in Algiers.
Zanganeh said Iran wanted to increase its daily output to pre-sanctions levels of four million barrels, from the current estimated level of up to 3.8 million.
Saudi Arabia and Iran, the Middle East's foremost Shiite and Sunni Muslim powers, are at odds over an array of issues including the wars in Syria and Yemen.
Zanganeh signalled that an agreement to stabilise oil prices could be struck at a November 30 meeting in Vienna of the Organization of Petroleum Exporting Countries.
And Saudi Oil Minister Khaled al-Faleh said he was optimistic that ministers would find some common ground.
"I remain optimistic on the basis of market fundamentals that are moving in the right direction and also on the producers coming to a common view," he said.
OPEC secretary-general Mohammed Barkindo, of Nigeria, suggested that the remarks from Iran and other producers were "all part of the consultations".
A previous bid to freeze output fell apart in Doha in April as Iran refused to take part, saying it needed to return output to pre-sanctions levels.