The safe application of geological carbon storage depends also on the seismic hazard associated with fluid injection. In this regard, we performed friction experiments using a rotary shear apparatus on precut basalts with variable degree of hydrothermal alteration by injecting distilled H2O, pure CO2, and H2O + CO2fluid mixtures under temperature, fluid pressure, and stress conditions relevant for large-scale subsurface CO2storage reservoirs. In all experiments, seismic slip was preceded by short-lived slip bursts. Seismic slip occurred at equivalent fluid pressures and normal stresses regardless of the fluid injected and degree of alteration of basalts. Injection of fluids caused also carbonation reactions and crystallization of new dolomite grains in the basalt-hosted faults sheared in H2O + CO2fluid mixtures. Fast mineral carbonation in the experiments might be explained by shear heating during seismic slip, evidencing the high chemical reactivity of basalts to H2O + CO2mixtures.

Frictional Instabilities and Carbonation of Basalts Triggered by Injection of Pressurized H2O- and CO2- Rich Fluids / Giacomel, Piercarlo; Elena, Spagnuolo; Nazzari, Manuela; Andrea, Marzoli; Francois, Passelegue; Nasrrddine, Youbi; Giulio Di Toro,. - In: GEOPHYSICAL RESEARCH LETTERS. - ISSN 0094-8276. - 45:12(2018), pp. 6032-6041. [10.1029/2018GL078082]

Frictional Instabilities and Carbonation of Basalts Triggered by Injection of Pressurized H2O- and CO2- Rich Fluids

GIACOMEL, Piercarlo
;
Manuela Nazzari;
2018

Abstract

The safe application of geological carbon storage depends also on the seismic hazard associated with fluid injection. In this regard, we performed friction experiments using a rotary shear apparatus on precut basalts with variable degree of hydrothermal alteration by injecting distilled H2O, pure CO2, and H2O + CO2fluid mixtures under temperature, fluid pressure, and stress conditions relevant for large-scale subsurface CO2storage reservoirs. In all experiments, seismic slip was preceded by short-lived slip bursts. Seismic slip occurred at equivalent fluid pressures and normal stresses regardless of the fluid injected and degree of alteration of basalts. Injection of fluids caused also carbonation reactions and crystallization of new dolomite grains in the basalt-hosted faults sheared in H2O + CO2fluid mixtures. Fast mineral carbonation in the experiments might be explained by shear heating during seismic slip, evidencing the high chemical reactivity of basalts to H2O + CO2mixtures.
2018
CO2storage in basalts; fast mineral carbonation; fault reactivation; Geophysics; Earth and Planetary Sciences (all)
01 Pubblicazione su rivista::01a Articolo in rivista
Frictional Instabilities and Carbonation of Basalts Triggered by Injection of Pressurized H2O- and CO2- Rich Fluids / Giacomel, Piercarlo; Elena, Spagnuolo; Nazzari, Manuela; Andrea, Marzoli; Francois, Passelegue; Nasrrddine, Youbi; Giulio Di Toro,. - In: GEOPHYSICAL RESEARCH LETTERS. - ISSN 0094-8276. - 45:12(2018), pp. 6032-6041. [10.1029/2018GL078082]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1174420
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