Van Krevelen diagram
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Van Krevelen diagrams are a graphical-statistical method that cross-plots the hydrogen:carbon (hydrogen index) in function of the oxygen:carbon (oxygen index) atomic ratios of carbon compounds. Different kinds of organic matter are more likely to produce oil during thermocatalytic maturation than other types: Algae, type 1, H-rich, O-poor, tend to make good oils. Trees and other woody vegetation are made of type 3 organic matter, O-rich, H-poor, and are sources of coal and gas. This diagram is mostly used for differentiating different types of kerogen.
References
- van Krevelen, D. W. (1950). "Graphical-statistical method for the study of structure and reaction processes of coal", Fuel, 29, 269-84.
- The chemistry and technology of petroleum
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