THE expulsion of hydrocarbons from coal is controlled by two main factors. The first is theproperties inherited from coal itself and contains two implications. One is original potential ofhydrocarbon generation from coal, which determines the degree of oil-bearing saturability; the THE expulsion of hydrocarbons from coal is controlled by two main factors. The first is the properties inherited from coal itself and contains two implications. One is original potential of hydrocarbon generation from coal, which determines the degree of oil-bearing saturability; the