The U.S. Energy Department has delivered more than 1 million barrels of emergency exchange oil due to supply disruptions caused by Hurricanes Gustav and Ike.

Officials said the emergency oil was delivered along pipeline systems from the U.S. Strategic Petroleum Reserve to various oil company refineries since Sunday.

The deliveries included 678,000 barrels to the ConocoPhillips Co.'s Wood River refinery, 250,000 barrels to the Marathon Petroleum Co.'s Midwest refineries and 109,000 barrels to a Placid Oil Co. refinery.

The U.S. Strategic Petroleum Reserve, which has a 1 billion-barrel capacity, is the largest stockpile of government-owned emergency crude oil in the world, the Energy Department said.