The majority of recent desalting efforts have addressed heavy or opportunity crudes.

脱盐方面的研究重点是处理重质原油和机会油。

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This can vary from about 0.05% by weight, as in some Pennsylvanian crudes. to about 2% in an average Middle East crude. and to 5% or more in heavy Nigerian or Mexican crudes.

硫的含量多少因地而异，比如宾夕法尼亚的某些原油硫含量按重量计约为0.05% ，中东原油平均约为2% ，而尼日利亚或墨西哥的重质原油为5%甚至更多。

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Light crudes also produce more gasoline than heavy crudes on a per barrel basis.

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Even sour and heavy crudes, which are cheaper, are still quite profitable.

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Likewise the distinction between light (low wax content) and heavy crudes are important for similar reasons, most refineries cannot process both equally well.

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