Chemical and stable isotope composition (18O/16O, 2H/1H) of formation waters from the Carabobo Oilfield, Venezuela
In this short note, we present the first data on stable isotope composition of the oilfield waters from Carabobo area of the Faja Petrolífera del Orinoco “Hugo Chávez” (Orinoco Oil Belt). From a chemical point of view, the formation waters show a main Na-Cl level (TDS up to 30g/l) with a dilution t...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Universitat de Barcelona (UB), Geociències Barcelona (Geo3BCN), Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDAEA), Universitat Autònoma de Barcelona (UAB)
2018-06-01
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| Series: | Geologica Acta |
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| Online Access: | https://revistes.ub.edu/index.php/GEOACTA/article/view/20023 |
| _version_ | 1797654560056016896 |
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| author | T. BOSCHETTI B. ANGULO F. QUINTERO J. VOLCÁN A. CASALINS |
| author_facet | T. BOSCHETTI B. ANGULO F. QUINTERO J. VOLCÁN A. CASALINS |
| author_sort | T. BOSCHETTI |
| collection | DOAJ |
| description |
In this short note, we present the first data on stable isotope composition of the oilfield waters from Carabobo area of the Faja Petrolífera del Orinoco “Hugo Chávez” (Orinoco Oil Belt). From a chemical point of view, the formation waters show a main Na-Cl level (TDS up to 30g/l) with a dilution trend toward Na-HCO3 composition (down to 1g/l). Until now, such a clear net chemical compositional trend was ascribed to a meteoric dilution (fresh/ brackish bicarbonate) of the seawater endmember (the saltiest chloride). The isotope results of this study reveal that the seawater mother water was modified during a high-temperature thrusting event (120–125°C), forming 18O-enriched diagenetic water (up to +4‰), which was diluted in recent times by glacial meltwater and presentday meteoric water. The hypothetical presence of flood by a meteoric paleo-water also offers new hints to explain the low API gravity (<10°API biodegraded, extra heavy oil) and composition of the local crude.
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| first_indexed | 2024-03-11T17:01:16Z |
| format | Article |
| id | doaj.art-64374f3b5c9a4ddba2c971be5c4dfc45 |
| institution | Directory Open Access Journal |
| issn | 1696-5728 |
| language | English |
| last_indexed | 2024-03-11T17:01:16Z |
| publishDate | 2018-06-01 |
| publisher | Universitat de Barcelona (UB), Geociències Barcelona (Geo3BCN), Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDAEA), Universitat Autònoma de Barcelona (UAB) |
| record_format | Article |
| series | Geologica Acta |
| spelling | doaj.art-64374f3b5c9a4ddba2c971be5c4dfc452023-10-20T07:26:41ZengUniversitat de Barcelona (UB), Geociències Barcelona (Geo3BCN), Institut de Diagnosi Ambiental i Estudis de l'Aigua (IDAEA), Universitat Autònoma de Barcelona (UAB)Geologica Acta1696-57282018-06-01163Chemical and stable isotope composition (18O/16O, 2H/1H) of formation waters from the Carabobo Oilfield, VenezuelaT. BOSCHETTI0B. ANGULO1F. QUINTERO2J. VOLCÁN3A. CASALINS4Department of Chemistry, life sciences and Environmental Sustainability, University of Parma Parco Area delle Scienze, 43124, Parma, Italy.Departamento de investigación estratégica en exploración. Instituto Tecnológico Venezolano del Petróleo (INTEVEP), Petróleos de Venezuela S.A. (PDVSA) Apartado 76343, Caracas 1070-A, Los Teques, Venezuela.Departamento de investigación estratégica en exploración. Instituto Tecnológico Venezolano del Petróleo (INTEVEP), Petróleos de Venezuela S.A. (PDVSA) Apartado 76343, Caracas 1070-A, Los Teques, Venezuela.Instituto de Ciencias de la Tierra. Universidad Central de Venezuela Apartado 3895, Caracas 1010-A, VenezuelaEstudios integrados, Petrolera Sinovensa Torre BVC, Barcelona 6001, Venezuela In this short note, we present the first data on stable isotope composition of the oilfield waters from Carabobo area of the Faja Petrolífera del Orinoco “Hugo Chávez” (Orinoco Oil Belt). From a chemical point of view, the formation waters show a main Na-Cl level (TDS up to 30g/l) with a dilution trend toward Na-HCO3 composition (down to 1g/l). Until now, such a clear net chemical compositional trend was ascribed to a meteoric dilution (fresh/ brackish bicarbonate) of the seawater endmember (the saltiest chloride). The isotope results of this study reveal that the seawater mother water was modified during a high-temperature thrusting event (120–125°C), forming 18O-enriched diagenetic water (up to +4‰), which was diluted in recent times by glacial meltwater and presentday meteoric water. The hypothetical presence of flood by a meteoric paleo-water also offers new hints to explain the low API gravity (<10°API biodegraded, extra heavy oil) and composition of the local crude. https://revistes.ub.edu/index.php/GEOACTA/article/view/20023Orinoco Oil BeltCarabobo areaFormation waterChemical and isotope composition. |
| spellingShingle | T. BOSCHETTI B. ANGULO F. QUINTERO J. VOLCÁN A. CASALINS Chemical and stable isotope composition (18O/16O, 2H/1H) of formation waters from the Carabobo Oilfield, Venezuela Geologica Acta Orinoco Oil Belt Carabobo area Formation water Chemical and isotope composition. |
| title | Chemical and stable isotope composition (18O/16O, 2H/1H) of formation waters from the Carabobo Oilfield, Venezuela |
| title_full | Chemical and stable isotope composition (18O/16O, 2H/1H) of formation waters from the Carabobo Oilfield, Venezuela |
| title_fullStr | Chemical and stable isotope composition (18O/16O, 2H/1H) of formation waters from the Carabobo Oilfield, Venezuela |
| title_full_unstemmed | Chemical and stable isotope composition (18O/16O, 2H/1H) of formation waters from the Carabobo Oilfield, Venezuela |
| title_short | Chemical and stable isotope composition (18O/16O, 2H/1H) of formation waters from the Carabobo Oilfield, Venezuela |
| title_sort | chemical and stable isotope composition 18o 16o 2h 1h of formation waters from the carabobo oilfield venezuela |
| topic | Orinoco Oil Belt Carabobo area Formation water Chemical and isotope composition. |
| url | https://revistes.ub.edu/index.php/GEOACTA/article/view/20023 |
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