Generation of hydrocarbons from coal

Oiagenesis Methane Lignite Brown coal Braun-  

Coal ranks are adapted from Vassoevich 1969, 1976 International Handbook of Coal Petrology, 1971 Hood et al, 1975. Stach et al, 1975 

Chemical changes in coal during its evolution through the different rank stages can be compared with the evolution of various kerogen types. The greatest chemical and evolutionary similarities are observed between coal and type III kerogen. 

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