A refinery is designed around a specific type of crude and can't refine any crude oil.
Especially true about oil from the Bakken; very light. Because pipelines have become such a political football, Bakken oil is often shipped by rail, where any subsequent derailment can then be catastrophic. The same people protesting against pipelines then rail againt railroadsAs you say; crude oil can be 'heavy' or 'light' & 'sweet' or 'sour.' Sweet/sour refers to sulfur. Sour crudes are full of sulfur which has to be removed from the oil.
Other famously light (and sweet!) crudes - Libya and Nigeria. Chart from the EIA and is a few years old .
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