Middle East oil is high in sulfur and this puts high demands on the equipment for refining. Oil from West Africa is low in sulfur and of high quality, and for this reason the proportion of oil bought from West Africa has continued to grow in recent years.
中東油質硫份高，對後續煉製設備的要求也較高，而西非的油質硫份低，品質好，因此近年來西非購油的比例持續成長。