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GEOLOGY OF NATURAL BITUMEN AND HEAVY OIL RESOURCES

Tar sand (also known as oil sand and bituminous sand) is a sand deposit that is impregnated with dense, viscous petroleum-like material called bitumen. Heavy oil reservoirs and tar sand deposits are widely distributed throughout the world in a variety of countries. Although the heavy oil reservoirs can be seen as reservoirs that are very similar in geological character to petroleum reservoirs, tar sand deposits can differ considerably from conventional crude oil, and heavy oil reservoirs. Thus, the various tar sand deposits have been described as belonging to two types: