The distribution and δ34S values of organic sulfur compounds in biodegraded oils from Peace River (Alberta Basin, western Canada)
The heavy sulfur-rich oils of the Peace River oil sands were formed by severe anaerobic biodegradation. To investigate the impacts of biodegradation on organic sulfur compounds (OSCs) we have measured the distribution and δ34S values of alkylated thioaromatics detected in four oils from each of two...
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ftcurtin:oai:espace.curtin.edu.au:20.500.11937/74544 2023-06-11T04:15:50+02:00 The distribution and δ34S values of organic sulfur compounds in biodegraded oils from Peace River (Alberta Basin, western Canada) He, N. Grice, Kliti Greenwood, P. 2019 restricted https://hdl.handle.net/20.500.11937/74544 https://doi.org/10.1016/j.orggeochem.2019.01.005 unknown Pergamon http://purl.org/au-research/grants/arc/DP150102235 http://hdl.handle.net/20.500.11937/74544 doi:10.1016/j.orggeochem.2019.01.005 Journal Article 2019 ftcurtin https://doi.org/20.500.11937/7454410.1016/j.orggeochem.2019.01.005 2023-05-30T19:56:09Z The heavy sulfur-rich oils of the Peace River oil sands were formed by severe anaerobic biodegradation. To investigate the impacts of biodegradation on organic sulfur compounds (OSCs) we have measured the distribution and δ34S values of alkylated thioaromatics detected in four oils from each of two Peace River wells (A and B). The fluid composition of the Peace River oil sands can be highly complex due to the variable contributions of sources, thermal maturity and secondary alteration. Nevertheless, a previous multi-molecular investigation of samples from well B oils (PR2 oil-leg of Marcano et al., 2013, Organic Geochemistry 59, 114–132) indicated that the oils had biodegradation levels (BLs) of 5–6, with biodegradation increasing down the oil column. The hydrocarbon composition of oils isolated from well A were biodegraded to a lesser degree than well B (i.e., the presence of isoprenoids and high molecular weight [MW] n-alkanes suggests BLs of ∼3–4). The concentrations of C1–C3 alkylated benzothiophenes (BTs) and C1–C3 alkylated dibenzothiophenes (DBTs) declined sharply through both wells consistent with increased biodegradation, although other alteration impacts (e.g., water washing) might also contribute. The rates of decrease recorded for selected isomers showed variable responses (e.g., 3&4-mBT > 2-mBT; 4-eDBT > 1,3-dmDBT) which implies different susceptibilities to biodegradation and which may contribute additional useful molecular parameters for evaluating the BL of biodegraded S-rich petroleum. The S-isotopic measurements showed a 34S enrichment in several alkyl BTs down the oil leg in well B, with their δ34S values increasing by up to 6‰, consistent with the microbial utilisation of 32S (n.b., the δ34S values of alkyl BTs were not measured in well A oils because of low aromatic sub-fraction concentrations). In contrast, there was little variation in the δ34S values of alkyl DBTs down both wells indicating negligible S-isotopic fractionation of these OSCs in the deeper more biodegraded oils, ... Article in Journal/Newspaper Peace River Curtin University: espace Canada Organic Geochemistry 128 16 25 |
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Curtin University: espace |
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ftcurtin |
language |
unknown |
description |
The heavy sulfur-rich oils of the Peace River oil sands were formed by severe anaerobic biodegradation. To investigate the impacts of biodegradation on organic sulfur compounds (OSCs) we have measured the distribution and δ34S values of alkylated thioaromatics detected in four oils from each of two Peace River wells (A and B). The fluid composition of the Peace River oil sands can be highly complex due to the variable contributions of sources, thermal maturity and secondary alteration. Nevertheless, a previous multi-molecular investigation of samples from well B oils (PR2 oil-leg of Marcano et al., 2013, Organic Geochemistry 59, 114–132) indicated that the oils had biodegradation levels (BLs) of 5–6, with biodegradation increasing down the oil column. The hydrocarbon composition of oils isolated from well A were biodegraded to a lesser degree than well B (i.e., the presence of isoprenoids and high molecular weight [MW] n-alkanes suggests BLs of ∼3–4). The concentrations of C1–C3 alkylated benzothiophenes (BTs) and C1–C3 alkylated dibenzothiophenes (DBTs) declined sharply through both wells consistent with increased biodegradation, although other alteration impacts (e.g., water washing) might also contribute. The rates of decrease recorded for selected isomers showed variable responses (e.g., 3&4-mBT > 2-mBT; 4-eDBT > 1,3-dmDBT) which implies different susceptibilities to biodegradation and which may contribute additional useful molecular parameters for evaluating the BL of biodegraded S-rich petroleum. The S-isotopic measurements showed a 34S enrichment in several alkyl BTs down the oil leg in well B, with their δ34S values increasing by up to 6‰, consistent with the microbial utilisation of 32S (n.b., the δ34S values of alkyl BTs were not measured in well A oils because of low aromatic sub-fraction concentrations). In contrast, there was little variation in the δ34S values of alkyl DBTs down both wells indicating negligible S-isotopic fractionation of these OSCs in the deeper more biodegraded oils, ... |
format |
Article in Journal/Newspaper |
author |
He, N. Grice, Kliti Greenwood, P. |
spellingShingle |
He, N. Grice, Kliti Greenwood, P. The distribution and δ34S values of organic sulfur compounds in biodegraded oils from Peace River (Alberta Basin, western Canada) |
author_facet |
He, N. Grice, Kliti Greenwood, P. |
author_sort |
He, N. |
title |
The distribution and δ34S values of organic sulfur compounds in biodegraded oils from Peace River (Alberta Basin, western Canada) |
title_short |
The distribution and δ34S values of organic sulfur compounds in biodegraded oils from Peace River (Alberta Basin, western Canada) |
title_full |
The distribution and δ34S values of organic sulfur compounds in biodegraded oils from Peace River (Alberta Basin, western Canada) |
title_fullStr |
The distribution and δ34S values of organic sulfur compounds in biodegraded oils from Peace River (Alberta Basin, western Canada) |
title_full_unstemmed |
The distribution and δ34S values of organic sulfur compounds in biodegraded oils from Peace River (Alberta Basin, western Canada) |
title_sort |
distribution and δ34s values of organic sulfur compounds in biodegraded oils from peace river (alberta basin, western canada) |
publisher |
Pergamon |
publishDate |
2019 |
url |
https://hdl.handle.net/20.500.11937/74544 https://doi.org/10.1016/j.orggeochem.2019.01.005 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Peace River |
genre_facet |
Peace River |
op_relation |
http://purl.org/au-research/grants/arc/DP150102235 http://hdl.handle.net/20.500.11937/74544 doi:10.1016/j.orggeochem.2019.01.005 |
op_doi |
https://doi.org/20.500.11937/7454410.1016/j.orggeochem.2019.01.005 |
container_title |
Organic Geochemistry |
container_volume |
128 |
container_start_page |
16 |
op_container_end_page |
25 |
_version_ |
1768372973045022720 |