Russia, and Venezuela. The estimated worldwide deposits of oil are more than 2 Toilbbl. Proven reserves of bitumen contain approximately 100 billion barrels, and total natural bitumen reserves are estimated at 249.67 Goilbbl worldwide, of which 176.8 Goilbbl, or 70.8%, are in Alberta, Canada.

Crude bitumen is a thick, sticky form of crude oil, and is so viscous that it will not flow unless heated or diluted with lighter hydrocarbons such as light crude oil