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截至到5月17日当周，原油库存增加470万桶，低于分析师预期的减少59.9万桶。这抬高了包括美国政府战略石油储备(SPR)在内的原油总库存量，达到4.768亿桶，为2017年7月以来的最高水平。
库存增加的部分原因是SPR的销售，SPR销量本周减少110万桶，为连续第四周销量减少。
分析师将库存增加归因于今年这个时候炼油厂的运营较正常情况更为缓慢。尤其值得一提的是，美国中西部5月份的炼油使用量降至2013年以来的最低水平。
