Characterization of asphaltic oil occurrences from the southeastern margin of the Basque-Cantabrian Basin, Spain

A geochemical investigation has been undertaken on biodegraded hydrocarbons in outcropping reservoirs of the south-eastern margin of the Basque-Cantabrian Basin (Álava sector). The aims of the study were the characterization of the geochemical features and biodegradation level of these hydrocarbons,...

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Authors: Marín Barba, P., Márquez Martínez, Gonzalo, Gallego, J. R., Permanyer, Albert
Format: article
Publication Date:2014
Country:España
Institution:Universidad de Huelva (UHU)
Repository:Arias Montano. Repositorio Institucional de la Universidad de Huelva
Language:English
OAI Identifier:oai:ariasmontano.uhu.es:10272/13677
Online Access:http://hdl.handle.net/10272/13677
Access Level:Open access
Keyword:Asphaltic oil occurrences
Basque-Cantabrian Basin
Álava sector
Ayoluengo oil field
Biodegradation
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spelling Characterization of asphaltic oil occurrences from the southeastern margin of the Basque-Cantabrian Basin, SpainMarín Barba, P.Márquez Martínez, GonzaloGallego, J. R.Permanyer, AlbertMárquez Martínez, GonzaloAsphaltic oil occurrencesBasque-Cantabrian BasinÁlava sectorAyoluengo oil fieldBiodegradationA geochemical investigation has been undertaken on biodegraded hydrocarbons in outcropping reservoirs of the south-eastern margin of the Basque-Cantabrian Basin (Álava sector). The aims of the study were the characterization of the geochemical features and biodegradation level of these hydrocarbons, and the evaluation of their resemblance to oils from the Ayoluengo onshore oil field by means of isotopic analyses and gas chromatography-mass spectrometry techniques. Most of the samples lack n-alkanes, isoprenoids, low molecular weight aromatic compounds, steranes, homohopanes, diasteranes and triaromatic steroids, whereas hexacyclic and heptacyclic alkanes appear as key compounds although some structures were not totally elucidated. Thermal maturity has been assessed with several parameters and a calculated-equivalent vitrinite reflectance value of around 0.8% was estimated. In addition, gammacerane content, diasterane-to-sterane ratio and C35 to C34 hopanes ratio suggest that the Álava oil shows were derived from a carbonate rock deposited in a reducing, water-stratified and possibly hypersaline environment. Isotopic signatures and other data confirmed that these hydrocarbons are not genetically related to the oils from Ayoluengo and, consequently, their origin is associated with a yet unknown source rock in the basin.Universitat de Barcelona20142014-01-0120142014-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10272/13677reponame:Arias Montano. Repositorio Institucional de la Universidad de Huelvainstname:Universidad de Huelva (UHU)InglésengMinisterio de Ciencia e Innovacion [CGL2010-15887] Not available Not availableopen accesshttp://purl.org/coar/access_right/c_abf2Atribución-NoComercial-SinDerivadas 3.0 Españahttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:ariasmontano.uhu.es:10272/136772026-06-02T14:58:11Z
dc.title.none.fl_str_mv Characterization of asphaltic oil occurrences from the southeastern margin of the Basque-Cantabrian Basin, Spain
title Characterization of asphaltic oil occurrences from the southeastern margin of the Basque-Cantabrian Basin, Spain
spellingShingle Characterization of asphaltic oil occurrences from the southeastern margin of the Basque-Cantabrian Basin, Spain
Marín Barba, P.
Asphaltic oil occurrences
Basque-Cantabrian Basin
Álava sector
Ayoluengo oil field
Biodegradation
title_short Characterization of asphaltic oil occurrences from the southeastern margin of the Basque-Cantabrian Basin, Spain
title_full Characterization of asphaltic oil occurrences from the southeastern margin of the Basque-Cantabrian Basin, Spain
title_fullStr Characterization of asphaltic oil occurrences from the southeastern margin of the Basque-Cantabrian Basin, Spain
title_full_unstemmed Characterization of asphaltic oil occurrences from the southeastern margin of the Basque-Cantabrian Basin, Spain
title_sort Characterization of asphaltic oil occurrences from the southeastern margin of the Basque-Cantabrian Basin, Spain
dc.creator.none.fl_str_mv Marín Barba, P.
Márquez Martínez, Gonzalo
Gallego, J. R.
Permanyer, Albert
Márquez Martínez, Gonzalo
author Marín Barba, P.
author_facet Marín Barba, P.
Márquez Martínez, Gonzalo
Gallego, J. R.
Permanyer, Albert
author_role author
author2 Márquez Martínez, Gonzalo
Gallego, J. R.
Permanyer, Albert
author2_role author
author
author
dc.contributor.none.fl_str_mv
dc.subject.none.fl_str_mv Asphaltic oil occurrences
Basque-Cantabrian Basin
Álava sector
Ayoluengo oil field
Biodegradation
topic Asphaltic oil occurrences
Basque-Cantabrian Basin
Álava sector
Ayoluengo oil field
Biodegradation
description A geochemical investigation has been undertaken on biodegraded hydrocarbons in outcropping reservoirs of the south-eastern margin of the Basque-Cantabrian Basin (Álava sector). The aims of the study were the characterization of the geochemical features and biodegradation level of these hydrocarbons, and the evaluation of their resemblance to oils from the Ayoluengo onshore oil field by means of isotopic analyses and gas chromatography-mass spectrometry techniques. Most of the samples lack n-alkanes, isoprenoids, low molecular weight aromatic compounds, steranes, homohopanes, diasteranes and triaromatic steroids, whereas hexacyclic and heptacyclic alkanes appear as key compounds although some structures were not totally elucidated. Thermal maturity has been assessed with several parameters and a calculated-equivalent vitrinite reflectance value of around 0.8% was estimated. In addition, gammacerane content, diasterane-to-sterane ratio and C35 to C34 hopanes ratio suggest that the Álava oil shows were derived from a carbonate rock deposited in a reducing, water-stratified and possibly hypersaline environment. Isotopic signatures and other data confirmed that these hydrocarbons are not genetically related to the oils from Ayoluengo and, consequently, their origin is associated with a yet unknown source rock in the basin.
publishDate 2014
dc.date.none.fl_str_mv 2014
2014-01-01
2014
2014-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10272/13677
url http://hdl.handle.net/10272/13677
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv Ministerio de Ciencia e Innovacion [CGL2010-15887] Not available Not available
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Atribución-NoComercial-SinDerivadas 3.0 España
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universitat de Barcelona
publisher.none.fl_str_mv Universitat de Barcelona
dc.source.none.fl_str_mv reponame:Arias Montano. Repositorio Institucional de la Universidad de Huelva
instname:Universidad de Huelva (UHU)
instname_str Universidad de Huelva (UHU)
reponame_str Arias Montano. Repositorio Institucional de la Universidad de Huelva
collection Arias Montano. Repositorio Institucional de la Universidad de Huelva
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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