The effect of origin and genetic processes of low molecular weight aromatic hydrocarbons in petroleum on their stable carbon isotopic compositions
Stable carbon isotopic compositions of individual low molecular weight aromatic hydrocarbons, such as alkylbenzenes, alkylnaphthalenes and alkylphenanthrenes, were measured from a set of oils, mostly from the North-West shelf of Australia, of varying age, facies type and thermal maturity. The object...
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| Format: | Journal Article |
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Pergamon
2014
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| Online Access: | http://hdl.handle.net/20.500.11937/7147 |
| _version_ | 1848745282524676096 |
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| author | Le Metayer, Pierre Grice, Kliti Chow, C. Caccetta, Louis Maslen, Ercin Dawson, Daniel Fusetti, L. |
| author_facet | Le Metayer, Pierre Grice, Kliti Chow, C. Caccetta, Louis Maslen, Ercin Dawson, Daniel Fusetti, L. |
| author_sort | Le Metayer, Pierre |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Stable carbon isotopic compositions of individual low molecular weight aromatic hydrocarbons, such as alkylbenzenes, alkylnaphthalenes and alkylphenanthrenes, were measured from a set of oils, mostly from the North-West shelf of Australia, of varying age, facies type and thermal maturity. The objective was to assess the influence of thermal maturity and source during generation of these aromatics on their stable carbon isotopic compositions. For most of the oils studied, δ13C of the aromatic components show a 13C depletion as the degree of methylation increases. For the alkylnaphthalenes, the 13C depletion is most pronounced for low maturity oils compared to high maturity oils. δ13C of the methyl groups of these alkylnaphthalenes were calculated and the resulting data display significant differences between ‘mature’ and ‘immature’ oils, suggesting that isotopically lighter methyl groups are ‘released’ as thermal maturation proceeds. Therefore, we propose an isotopic fractionation associated with the methyl transfer mechanisms affecting low molecular weight aromatic hydrocarbons during diagenesis. |
| first_indexed | 2025-11-14T06:14:53Z |
| format | Journal Article |
| id | curtin-20.500.11937-7147 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:14:53Z |
| publishDate | 2014 |
| publisher | Pergamon |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-71472017-09-13T14:38:34Z The effect of origin and genetic processes of low molecular weight aromatic hydrocarbons in petroleum on their stable carbon isotopic compositions Le Metayer, Pierre Grice, Kliti Chow, C. Caccetta, Louis Maslen, Ercin Dawson, Daniel Fusetti, L. Methane Petroleum Carbon isotopes Sources Maturity Aromatic Hydrocarbons Trans-alkylation Reservoirs Geosynthetic Processes Stable carbon isotopic compositions of individual low molecular weight aromatic hydrocarbons, such as alkylbenzenes, alkylnaphthalenes and alkylphenanthrenes, were measured from a set of oils, mostly from the North-West shelf of Australia, of varying age, facies type and thermal maturity. The objective was to assess the influence of thermal maturity and source during generation of these aromatics on their stable carbon isotopic compositions. For most of the oils studied, δ13C of the aromatic components show a 13C depletion as the degree of methylation increases. For the alkylnaphthalenes, the 13C depletion is most pronounced for low maturity oils compared to high maturity oils. δ13C of the methyl groups of these alkylnaphthalenes were calculated and the resulting data display significant differences between ‘mature’ and ‘immature’ oils, suggesting that isotopically lighter methyl groups are ‘released’ as thermal maturation proceeds. Therefore, we propose an isotopic fractionation associated with the methyl transfer mechanisms affecting low molecular weight aromatic hydrocarbons during diagenesis. 2014 Journal Article http://hdl.handle.net/20.500.11937/7147 10.1016/j.orggeochem.2014.04.008 Pergamon restricted |
| spellingShingle | Methane Petroleum Carbon isotopes Sources Maturity Aromatic Hydrocarbons Trans-alkylation Reservoirs Geosynthetic Processes Le Metayer, Pierre Grice, Kliti Chow, C. Caccetta, Louis Maslen, Ercin Dawson, Daniel Fusetti, L. The effect of origin and genetic processes of low molecular weight aromatic hydrocarbons in petroleum on their stable carbon isotopic compositions |
| title | The effect of origin and genetic processes of low molecular weight aromatic hydrocarbons in petroleum on their stable carbon isotopic compositions |
| title_full | The effect of origin and genetic processes of low molecular weight aromatic hydrocarbons in petroleum on their stable carbon isotopic compositions |
| title_fullStr | The effect of origin and genetic processes of low molecular weight aromatic hydrocarbons in petroleum on their stable carbon isotopic compositions |
| title_full_unstemmed | The effect of origin and genetic processes of low molecular weight aromatic hydrocarbons in petroleum on their stable carbon isotopic compositions |
| title_short | The effect of origin and genetic processes of low molecular weight aromatic hydrocarbons in petroleum on their stable carbon isotopic compositions |
| title_sort | effect of origin and genetic processes of low molecular weight aromatic hydrocarbons in petroleum on their stable carbon isotopic compositions |
| topic | Methane Petroleum Carbon isotopes Sources Maturity Aromatic Hydrocarbons Trans-alkylation Reservoirs Geosynthetic Processes |
| url | http://hdl.handle.net/20.500.11937/7147 |