Fractionation of azaarenes during oil migration

A comparative study of alkylbenzoquinolines in crude oils and rock extracts (bitumens) from Japan and Sumatra shows that the ratios of nitrogen-masked isomers (NMIs) to nitrogen-exposed isomers (NEIs), and the ratio of higher homologs to lower homologs is higher in crude oils than in corresponding b...

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Bibliographic Details
Published in:Organic geochemistry 1992-12, Vol.19 (4), p.389-402
Main Author: Yamamoto, Masanobu
Format: Article
Language:English
Subjects:
azaarenes
benzoquinoline
bitumen
crude oil
Earth sciences
Earth, ocean, space
Exact sciences and technology
geochromatography
Hydrocarbons
Isotope geochemistry
Isotope geochemistry. Geochronology
oil migration
organic nitrogen compounds
Sedimentary rocks
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Summary:A comparative study of alkylbenzoquinolines in crude oils and rock extracts (bitumens) from Japan and Sumatra shows that the ratios of nitrogen-masked isomers (NMIs) to nitrogen-exposed isomers (NEIs), and the ratio of higher homologs to lower homologs is higher in crude oils than in corresponding bitumens. Also, a regular increase in the ratios of NMIs to NEIs with increasing migration distance is observed for a series of crude oils from the Sarukawa Oil Field, northeastern Japan. These results are attributed to the preferential migration of NMIs caused by their weak adsorption on clay minerals and/or their low solubility in interstitial water, and the selective removal of lower honologs caused by their irreversible adsorption onto clays during oil migration, which are regarded as geochromatographic phenomena. It is suggested that those ratios can be used to estimate the degree of fractionation of oils during primary and secondary migration.
ISSN:0146-6380
1873-5290
DOI:10.1016/0146-6380(92)90007-K