The kingdom called out members for overproducing, in what was seen as a veiled threat of a price war.

Part of the issue is that members are not sticking to their pledged cuts. The Saudi minister called out Iraq, which surpassed its quota by 400,000 barrels per day in August, according to S&P Global Ratings data. Kazakhstan, which overproduced by 120,000 barrels a day, was also singled out.

OPEC rebutted a Wall Street Journal report on Wednesday, calling it wholly inaccurate and misleading in saying that Saudi Arabia's energy minister warned oil prices will drop to $50 per barrel if OPEC+ members do not stick to agreed-upon production limits.