Chemical and stable isotope composition (18O/16O, 2H/1H) of formation waters from the Carabobo Oilfield, Venezuela
Boschetti, Tiziano (Università di Parma. Dipartamento di Scienze ambientali)
Angulo, B. (Instituto Tecnológico Venezolano del Petróleo (INTEVEP). Departamento de Investigación Estratégica en Exploración.)
Quintero, F. (Instituto Tecnológico Venezolano del Petróleo (INTEVEP). Departamento de Investigación Estratégica en Exploración.)
Volcán, J. (Universidad Central de Venezuela. Instituto de Ciencias de la Tierra)
Casalins, A. (Estudios Integrados, Petrolera Sinovensa (Barcelona, Veneçuela))

Date:	2018
Abstract:	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.
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan aquestes es distribueixin sota la mateixa llicència que regula l'obra original i es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Orinoco oil belt ; Carabobo area ; Formation water ; Chemical and isotope composition
Published in:	Geologica acta, Vol. 16 Núm. 3 (September 2018) , p. 257-264, I-III (Short note) , ISSN 1696-5728

Adreça alternativa: https://raco.cat/index.php/GeologicaActa/article/view/341268
Adreça alternativa: https://revistes.ub.edu/index.php/GEOACTA/article/view/GeologicaActa2018.16.3.2
DOI: 10.1344/GeologicaActa2018.16.3.2

11 p, 2.1 MB

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