Chemical and stable isotope composition (18O/16O, 2H/1H) of formation waters from the Carabobo Oilfield, Venezuela

IF 1.3 4区 地球科学 Q2 GEOLOGY
T. Boschetti, B. Angulo, F. Quintero, J. Volcan, A. Casalins
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引用次数: 1

Abstract

In this short note, we present the first data on stable isotope composition of the oilfield waters from Carabobo area of the Faja Petrolifera del Orinoco “Hugo Chavez” (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.
委内瑞拉Carabobo油田地层水化学和稳定同位素组成(18O/16O, 2H/1H
在这篇简短的文章中,我们首次介绍了Faja Petrolifera del Orinoco“Hugo Chavez”(Orinoco油带)Carabobo地区油田水的稳定同位素组成数据。从化学角度看,地层水以Na-Cl为主(TDS达30g/l), Na-HCO3组分有稀释趋势(降至1g/l)。到目前为止,如此明确的净化学成分趋势被归因于海水末端成员(最咸的氯化物)的大气稀释(新鲜/微咸碳酸氢盐)。同位素结果表明,海水母水在高温逆冲事件(120 ~ 125℃)中发生了变质,形成了富18o的成岩水(高达+4‰),并在近代被冰川融水和现代大气水稀释。大气古水洪水的假设存在也为解释当地原油的低API重力(<10°API生物降解,超重油)和成分提供了新的线索。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Geologica Acta
Geologica Acta 地学-地质学
CiteScore
2.50
自引率
6.70%
发文量
13
审稿时长
>12 weeks
期刊介绍: - Relevant conceptual developments in any area of the Earth Sciences. - Studies presenting regional synthesis. - Thematic issues or monographic volumes presenting the results from one or more research groups. - Short papers reflecting interesting results or works in progress. - Contributions and results from Research Projects, Workshops, Symposiums, Congresses and any relevant scientific activity related to Earth Sciences. - Geologica Acta aims to stimulate rapid diffusion of results and efficient exchange of ideas between the widespread communities of Earth Science researchers (with special emphasis on Latinamerica, the Caribbean, Europe, the Mediterranean
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