Bloomberg News headlines indicate that Iraq has begun shutting down oil output at Rumaila, the world's largest "supergiant" oil field, while other Gulf states have idled some of the world's largest refineries and major energy hubs following Iranian drone strikes. This signals that a massive energy disruption is set to hit global energy markets as the Strait of Hormuz remains paralyzed. Goldman analysts led by Duffy Fischer have released a note assessing whether U.S. chemical manufacturers have exposure to Middle East energy disruptions. They find…