美国需要的原油半数以上依靠进口。原油运输又以用巨型油轮(VLCC 17.5～30万载重吨)和超巨油轮(ULCC30万载重吨以上)最为经济。由于美国海岸水深不足,没有深水港,一直不得不将原油运到加勒比海后,或者在沿岸深水港卸载,然后用小油轮转载运到美国,或者在海上或掩护水域直接用小油轮倒载运到美国。这种接运方式显 More than half of the crude oil that the United States needs depends on imports. In turn, crude oil transportation is most economically based on giant tankers (VLCC 17.5-30 million dwt) and super-huge tankers (ULCC 30,000 dwt or more). Due to the lack of water depth in the United States coast and no deep-water port, it had to either unload the crude oil to the Caribbean Sea or unload it at the deep-water port along the coast and then use a small tanker to deliver it to the United States or a small tanker at sea or cover water United States. This pick the way was significant