The Organization of the Petroleum Exporting Countries proposed Thursday that oil output be curbed by 1.5 million barrels a day, or 1.5 percent of world oil supplies, to deal with the effects of the spreading coronavirus outbreak on demand.

The proposed cuts are higher than most analysts expected but seem unlikely to change the gloomy sentiment in the oil market. After the announcement, prices for Brent crude, the international benchmark, fell about 0.8 percent to $50.71 a barrel.

The group wants the cuts, which would run through June 30, to be shared with non-OPEC allies. Under the proposal, the 14 members of OPEC would make one million barrels of trims, while Russia and other allies would cut 500,000 barrels.

The deal will need to be ratified at a meeting, scheduled for Friday in Vienna, of officials from OPEC, Russia, and other oil-producing countries like Kazakhstan and Oman. Uncertainty over an agreement may explain the market’s negative reaction.