Distribution and origin of organic compounds in the condensates from a Mexican high-temperature geothermal field

•This is the first description of dissolved organics in a super-hot active field.•A thermogenic origin is the main precursor of dissolved organics in the condensates.•Injection and exploitation of the field could affect the dissolved organic composition. We report herein for the first time, the pres...

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Bibliographic Details
Published in:Geothermics 2021-01, Vol.89, p.101980, Article 101980
Main Authors: Sánchez-Avila, Juan Ignacio, García-Sánchez, Brenda Estela, Vara-Castro, Gabriela Michel, Kretzschmar, Thomas
Format: Article
Language:English
Subjects:
Alkanes
Aromatic compounds
Biogenic and abiogenic origin
Condensates
Exploitation
Geothermal power
High temperature
Homology
Hydrothermal systems
Los humeros geothermal field
Organic compounds
Organic dissolved fraction
Organic matter
SPE–GC–MS analysis
Super-hot geothermal system
Water wells
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Summary:•This is the first description of dissolved organics in a super-hot active field.•A thermogenic origin is the main precursor of dissolved organics in the condensates.•Injection and exploitation of the field could affect the dissolved organic composition. We report herein for the first time, the presence and relative composition of medium volatility organic compounds in samples from a super-hot geothermal field in Mexico. We sampled ten water/vapor condensates from active exploitation wells from Los Humeros Geothermal field. We identified 48 compounds, being alkanes, aromatics and S-bearing the predominant homologues, followed by O-bearing. Evidence suggests that the origin of the hydrocarbons is mainly thermogenic derived from hydrothermal alteration of buried organic matter, supported by the presence of aromatics, S-bearing and an alkane CPI below 1. The results of this study increase the scarce knowledge of dissolved organic fraction in hydrothermal systems.
ISSN:0375-6505
1879-3576
DOI:10.1016/j.geothermics.2020.101980