Dissolved CO2 and Alkane Gas in Clay Formations

Lerouge, C.; Blessing, M.; Flehoc, C.; Gaucher, E.C.; Henry, B.; Lassin, A.; Marty, N.; Matray, J.M.; Proust, E.; Rufer, Daniel; Tremosa, J.; Vinsot, A. (2015). Dissolved CO2 and Alkane Gas in Clay Formations. Procedia earth and planetary science, 13, pp. 88-91. Elsevier 10.1016/j.proeps.2015.07.021

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Characterization of dissolved CO2 and alkane gas in clayrocks may help assessing the confinement properties of geological barriers considered as potential host rocks for a deep geological disposal as well as for caprocks of gas storages. A monitoring of alkanes with CO2, combined with carbon isotopes was performed on core samples coming from Underground Research Laboratories (Bure, Mont Terri, Tournemire) and the Schlattingen borehole in France and Switzerland. Composition of hydrocarbon gas and delta C-13 of methane strongly suggest a dominant thermogenic origin of methane which is mixed with a bacterial origin for the Toarcian shales, Pliensbachien and Callovian-Oxfordian clayrocks. Results also evidence the contrasted behavior of CO2, which is controlled by chemical equilibrium between pore water and carbonate mineralogy, compared to the alkanes which are present in the porosity as a stock of dissolved gases which can be depleted during degassing experiments. (C) 2015 The Authors. Published by Elsevier B.V.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Geological Sciences
08 Faculty of Science > Institute of Geological Sciences > Rock-Water Interaction

UniBE Contributor:

Rufer, Daniel

Subjects:

500 Science > 550 Earth sciences & geology

ISSN:

1878-5220

Publisher:

Elsevier

Language:

English

Submitter:

Daniel Rufer

Date Deposited:

08 Jul 2016 16:23

Last Modified:

30 Jan 2017 16:21

Publisher DOI:

10.1016/j.proeps.2015.07.021

Web of Science ID:

000360103500022

BORIS DOI:

10.7892/boris.84367

URI:

https://boris.unibe.ch/id/eprint/84367

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