CATAGENESIS AND COMPOSITION OF PETROLEUM: ORIGIN OF N-ALKANES AND ISOALKANES IN PETROLEUM CRUDES
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dc.contributor.author | Kissin Y.V. | |
dc.date.accessioned | 2020-04-17T08:19:52Z | |
dc.date.available | 2020-04-17T08:19:52Z | |
dc.date.issued | 1987 | |
dc.identifier | https://elibrary.ru/item.asp?id=38703109 | |
dc.identifier.citation | GEOCHIMICA ET COSMOCHIMICA ACTA, 1987, 51, 9, 2445-2457 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/16973 | |
dc.description.abstract | Distribution of n-alkanes and isoalkanes in ca. 50 petroleum crudes have been examined by the gas chromatography. Molar distributions of n-alkanes with respect to their c atom numbers in the majority of crudes follow the exponential law, which signifies a random, chemical nature of n-alkane-generating processes occurring in the catagenesis stage of petroleum maturation. Similar distributions of n-alkanes were found in the products of mild thermolysis of heavy n-alkanes.Isoalkanes represent a major, 10–25%, petroleum component. The principal types of isoalkanes in crudes are monomethyl-branched, with the branches randomly positioned in the chains, and dimethyl-branched with one of the methyl groups predominantly in the second position in the chains. Thermolysis studies of individual n-alkanes, alkanoic acids, and esters in the presence of various minerals provided an explanation of the n-alkane and isoalkane distributions. Selected heavy n-alkanes are initially formed in decarboxylation reactions of heavy n-alkanoic acids and esters. Extensive thermocracking produces mixtures of lighter n-alkane and α-olefins. The olefins, in the presence of acidic clays, are converted in cationic reactions into mixtures of predominantly mono- and dimethyl-branched isoalkanes. | |
dc.title | CATAGENESIS AND COMPOSITION OF PETROLEUM: ORIGIN OF N-ALKANES AND ISOALKANES IN PETROLEUM CRUDES | |
dc.type | Статья |
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