Petroleum | National Geographic Society
Oct 05, 2018#0183;#32;About 80% of Canadas oil sands can be accessed through drilling, and 20% by surface mining. Refining Petroleum Refining petroleum is the process of converting crude oil or bitumen into more useful products, such as fuel or asphalt. Crude oil comes out of the ground with impurities, from sulfur to sand. These components have to be separated.