" 2H18得前景值得密切注意影响全球石油需求和非OPEC供应得因素，这些因素将影响石油市并未来得前景，" OPEC在报告中称。
Demand for OPEC crude in the second half of 2018 will exceed the bloc's May production level by 1.47 million b/d, its analysts forecast Tuesday, as ministers prepare to meet in Vienna next week to debate an output increase favored by some members.
In its closely watched monthly oil market report, OPEC's analytics arm pegged the so-called call on OPEC crude for the second half of 2018 at 33.34 million b/d.
Platts survey: OPEC May crude oil output slides to 13-month low of 31.90 mil b/d
Meanwhile, independent secondary sources used by the organization to track production estimated OPEC's May output at 31.87 million b/d.
But OPEC said there was "pronounced uncertainty" in the market's outlook, with global economic activity slowing in the first quarter, expected monetary tightening and the risk of escalating trade wars. As such, it noted that some outside estimates of the call on OPEC crude are as much as 1.7 million b/d lower than the most bullish forecasts.
"This outlook for 2H18 warrants close monitoring of the factors impacting both world oil demand and non-OPEC supply that will shape the outlook of the oil market going forward," OPEC said in its report.
OPEC meets June 22 in Vienna to assess the future of its 1.8 million b/d supply cut agreement with 10 non-OPEC partners, led by Russia.
The bloc's May output level is 870,000 b/d below its notional ceiling of about 32.74 million b/d, when every country's quota under the production cut deal is added up. That could give OPEC some breathing room to boost output while still remaining collectively compliant with its cut commitment, though this would likely spark a bitter intra-OPEC market share battle.