Russian Energy Minister Alexander Novak believed that by removing condensate from the crude oil production calculation, his country's production in December would be about 225 to 230,000 barrels a day lower. The group will meet again in early March for an extraordinary meeting to set its policy.
The new targets will be in force for January, February and March 2020, when the OPEC+ group will hold a fresh high-level meeting to agree on further production targets.
Saudi Energy Minister Prince Abdulaziz bin Salman said the Kingdom, the world's largest oil exporter and OPEC's defacto leader, would continue a voluntary cut of 400,000 bpd.
The group, which pumps more than half the world's oil, agreed in Vienna on Friday to reduce its output target by 500,000 barrels a day, said a delegate, bringing it in line with recent production levels.
Ministers were unusually tight-lipped as they filed out of Thursday's meeting in Vienna.
Oil traded near $58 a barrel as the market awaited crucial details on how OPEC+ will distribute cuts among its members. That's something the alliance has struggled to achieve throughout the three years of its existence, with some countries such as Iraq actually increasing output after promising to cut.
"The extent to which it represents real cuts and/or improved compliance" was also unclear, he added.
Washington has forced an even steeper reduction in supply through sanctions on OPEC members Iran and Venezuela aimed at choking both countries' oil export revenue.
Saudi Arabia needs higher oil prices to support its budget revenue and the pending share sale of state-owned oil giant Saudi Aramco with pricing of its initial public offering (IPO) expected on Thursday.
The group made a decision to cut output by an extra 500,000 barrels a day as they try to support the price of energy and bolster their revenues.
"This would lead to total adjustments of 1.7 mb/d".
"We shall see where the shares head on day one", Wilson remarked. Brent, the worldwide benchmark, jumped 82 cents to $64.21 a barrel.
Despite the glitzy headlines, OPEC remains under pressure from factors that include a trade war that has curbed the oil-thirsty Chinese economy, and weak activity across Europe.
Meanwhile, output by oil producers outside OPEC is breaking records: the USA has been the world's biggest producer since 2018, Brazil and Canada have also increased output and others such as Norway are planning to do so.