The Vienna meeting, which includes major producer Russia, aims to nail down details on implementing the accord reached late last month.
Analysts however remained divided over the gathering's impact as doubts lingered regarding countries' willingness to freeze output.
"We do not expect the outcome of this meeting to play a significant role in rebalancing the oil market," Vienna-based analyst group JBC Energy said yesterday.
The Organization of the Petroleum Exporting Countries agreed on November 30 to lower its monthly output by 1.2 million barrels per day (bpd) to 32.5 million bpd as of January.
Arriving shortly before the start of the talks, cartel chief Mohammed Barkindo of Nigeria expressed optimism about the chances of reaching an agreement to cut output by 600,000 bpd "and even more".
"This is a very historic meeting due to the presence of OPEC and non-OPEC members," he said.
"The political atmosphere has changed."
Moscow -- the world's largest oil producer along with OPEC kingpin Saudi Arabia -- has already signalled it would provide half of that production cut in the first half of 2017.
"We have stated our obligations and will abide by the figures we have talked about," he was quoted as saying by Russia's Interfax news agency.
"For the non-OPEC countries gathered here, I think it will be about 600,000 tonnes in total.
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