美国炼油厂爆炸，美股期货跳水，国际油价拉升，布油涨超4%

Group 1 - The U.S. stock index futures experienced a decline, with the Dow Jones index futures down by 0.47%, Nasdaq 100 index futures down by 0.54%, and S&P 500 index futures down by 0.49% [1] Group 2 - International oil prices have been rising, with WTI crude oil increasing by over 3.7% to $91.4 per barrel, and Brent crude oil rising by over 4%, approaching $100 per barrel [3] - An explosion occurred at the Valero refinery in Port Arthur, Texas, on March 23, which was reportedly caused by a malfunction in industrial heating equipment. The explosion was accompanied by loud noises and thick black smoke, prompting local authorities to issue a shelter-in-place order and traffic controls around highways 82 and 87 [5] - The refinery has a processing capacity of approximately 400,000 barrels per day, and initial assessments indicate that the impact of the incident is localized, with no large-scale production stoppages or supply disruptions reported [5] - Geopolitical tensions in the Middle East are expected to keep international oil prices at high levels, as indicated by Jin Lian Chuang's analysis [5]