What is Crude Oil?

Oil 101 - Introduction to the Oil and Gas Industry It is important to understand a few basic properties of crude oil, the key raw material processed in a refinery. Crude oils are not all the same, but rather vary in color, composition, and consistency. They are generally classified as” light” or “ heavy”, and “sweet” or “sour”. Unlike water, crude oil is not a chemical compound. Rather, it is a complex mixture of molecules, consisting of compounds formed from hydrogen a