LAPSE:2023.27249
Published Article
LAPSE:2023.27249
Origin and Biodegradation of Crude Oils from the Northernmost Fields in the Bolivar Coastal Complex (Zulia State, Venezuela)
April 4, 2023
Abstract
The organic geochemical features of 30 sampled oils from the northern Bolivar Coastal Complex (Lake Maracaibo Basin, NW Venezuela) were examined by combining carbon isotope, classical biomarker, and extended diamondoid analyses to clarify source facies and to assess the thermal maturity and extent of biodegradation of the oils analyzed. In this work, oils are understood as a mixture of two episodes of petroleum generation from the La Luna Formation: a paleobiodegraded oil pulse during Paleogene times and a late pulse having a higher maturity in the post-Oligocene. For the oil samples analyzed, results revealed a mixing composed of different proportions of almost a terrestrially derived siliciclastic-sourced and a purely marine carbonate-sourced oil pulse. Moreover, two main groups of oils were identified by means of hierarchical cluster analysis. Finally, inter- and intrafield variations in the extent of biodegradation were also assessed using two classification schemes (Peters and Moldowan, and Manco scales).
The organic geochemical features of 30 sampled oils from the northern Bolivar Coastal Complex (Lake Maracaibo Basin, NW Venezuela) were examined by combining carbon isotope, classical biomarker, and extended diamondoid analyses to clarify source facies and to assess the thermal maturity and extent of biodegradation of the oils analyzed. In this work, oils are understood as a mixture of two episodes of petroleum generation from the La Luna Formation: a paleobiodegraded oil pulse during Paleogene times and a late pulse having a higher maturity in the post-Oligocene. For the oil samples analyzed, results revealed a mixing composed of different proportions of almost a terrestrially derived siliciclastic-sourced and a purely marine carbonate-sourced oil pulse. Moreover, two main groups of oils were identified by means of hierarchical cluster analysis. Finally, inter- and intrafield variations in the extent of biodegradation were also assessed using two classification schemes (Peters and Moldowan, and Manco scales).
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Keywords
biodegradation scales, Bolivar Coastal Complex, mixed oils, QEDA analysis, source facies
Subject
Suggested Citation
Escobar M, Márquez G, Guerrero B, Marín P, Boente C, Bernardo-Sánchez A, Romero E, Permanyer A. Origin and Biodegradation of Crude Oils from the Northernmost Fields in the Bolivar Coastal Complex (Zulia State, Venezuela). (2023). LAPSE:2023.27249
Author Affiliations
Escobar M: Postgraduate Studies in Petroleum Geology, Faculty of Engineering, University of Zulia, Maracaibo 10482, Venezuela
Márquez G: Department of Mining, Mechanical, Energetic and Civil Engineering, University of Huelva, 21819 Huelva, Spain
Guerrero B: Department of Exploration and Production, PDVSA Western Division, Maracaibo 4002, Venezuela
Marín P: Department of Mining, Mechanical, Energetic and Civil Engineering, University of Huelva, 21819 Huelva, Spain
Boente C: Department of Mining, Mechanical, Energetic and Civil Engineering, University of Huelva, 21819 Huelva, Spain [ORCID]
Bernardo-Sánchez A: Department of Mining Technology, Topography and Structures, University of León, 24071 León, Spain [ORCID]
Romero E: Department of Mining, Mechanical, Energetic and Civil Engineering, University of Huelva, 21819 Huelva, Spain [ORCID]
Permanyer A: Department of Mineralogy, Petrology and Applied Geology, University of Barcelona, 08028 Barcelona, Spain [ORCID]
Márquez G: Department of Mining, Mechanical, Energetic and Civil Engineering, University of Huelva, 21819 Huelva, Spain
Guerrero B: Department of Exploration and Production, PDVSA Western Division, Maracaibo 4002, Venezuela
Marín P: Department of Mining, Mechanical, Energetic and Civil Engineering, University of Huelva, 21819 Huelva, Spain
Boente C: Department of Mining, Mechanical, Energetic and Civil Engineering, University of Huelva, 21819 Huelva, Spain [ORCID]
Bernardo-Sánchez A: Department of Mining Technology, Topography and Structures, University of León, 24071 León, Spain [ORCID]
Romero E: Department of Mining, Mechanical, Energetic and Civil Engineering, University of Huelva, 21819 Huelva, Spain [ORCID]
Permanyer A: Department of Mineralogy, Petrology and Applied Geology, University of Barcelona, 08028 Barcelona, Spain [ORCID]
Journal Name
Energies
Volume
13
Issue
21
Article Number
E5615
Year
2020
Publication Date
2020-10-27
ISSN
1996-1073
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Original Submission
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PII: en13215615, Publication Type: Journal Article
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LAPSE:2023.27249
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https://doi.org/10.3390/en13215615
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