Classification of crude

Fonseca, A.M., et al, Geographical classification of crude oil by Kohonen selforganizing maps, Analytica Chimica Acta, 556, 374, 2006. 

A. M. Fonseca, J. L. Vizcaya, J. Aires-de-Sousa and A. M. Lobo, Geographical classification of crude oils by Kohonen self-organizing maps, Anal. Chim. Acta, 556(2), 2006, 374-382. 

The petroleum industry has not agreed on a standard classification system. Further, the classification of crude oil is of little importance in its production, with the exception that paraffinic crudes can precipitate wax... 

Elemental analyses of petroleum show that it contains mainly carbon and hydrogen. Nitrogen, oxygen, and sulfur (heteroelements) are present in smaller amounts, and trace elements such as vanadium, nickel, etc, are also present. Of the heteroelements, sulfur is the most important. The mixture of hydrocarbons is highly complex. Paraffinic, naphthenic, and aromatic structures can occur in the same molecule, and the complexity increases with boiling range. The attempted classification of crude oils in terms of these three main structural types has proved inadequate. 

Fig. 4.22 Classification of crude oils based on distribution of paraffins, naphthenes and aromatics plus NSO compounds (afterTissot Welte 1984).

FIG. 2—Classification of crude oils based on petroleum fractions [8[. 

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