London ? OPEC’s plan to cut its oil production target by 4 percent appears to be unraveling, as group members ignore their self-imposed quotas to take advantage of high crude prices and meet the surging demand for oil in China and the United States.

Despite announcing two production cuts in six months, the Organization of Petroleum Exporting Countries has boosted its output to try to keep pace with the rising market.

OPEC agreed last month to reduce its output ceiling by 1 million barrels a day starting Thursday, in an effort to keep prices from tumbling during a seasonal lull in demand this spring.

But as OPEC representatives prepare to meet Wednesday in Vienna, Austria, to review the oil market, some no longer are treating next month’s cut as inevitable and are suggesting instead that all options — even an increase in output — are now open.

That could portend cheaper and more plentiful crude, but it probably wouldn’t be enough to comfort American motorists, analysts say.