Findarticles.com reported on Defining heavy oil:

Defining heavy oil. The topic of heavy oil presented in September’s column (p. 21, World Oil, Sept. 2005) elicited follow-up comments that clarify the definition of these thick crudes. The history of the definitions begins when the US Department of Energy sponsored a Tar Sands Definitional Workshop in 1980 to guide regulatory treatment of these resources. Thirteen oil company representatives met to form a consensus that would define the resource, exclude conventional heavy oil, determine measurability and meet regulatory needs.

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