OPEC production fell in February as Saudi Arabia continued to compensate for other cartel members who have not yet achieved promised output cuts.
The producer group also raised concerns about rising global oil inventories and resurgent U.S. supply in its monthly report, and raised its forecast for non-OPEC production for 2017.
The Organization of the Petroleum Exporting Countries produced a combined 31.96 million barrels a day last month, compared with 32.1 million barrels a day in January, according to secondary sources.
"High compliance with supply adjustments by OPEC and some non-OPEC producers supported gains" in crude oil futures in February, OPEC said.
Output by the members that committed to cutting production late last year was 29.7 million barrels a day, compared with 29.9 million last month. Libya and Nigeria are exempt as they attempt to restore supply sidelined by internal conflict.
Iran is permitted to increase its pumping to a certain extent. The February figures showed it was producing about 17,000 barrels a day above that level.
Among the cartel members still pumping beyond promised levels are Iraq, OPEC's second largest producer, and the United Arab Emirates, which pumped 63,000 and 51,000 barrels a day above their quotas, respectively.
OPEC agreed in November to curb output by 1.2 million barrels a day in the first half of 2017 to reduce a global oversupply of crude oil. Eleven other exporters including Russia committed to reducing their total supply by 556,000 in December.
While Reuters put the group's combined compliance to the output cut deal above 100 percent, Saudi Arabia continues to provide the lion's share of reductions.