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Geophys Res Lett. 2018 Jun 28;45(12):6032-6041. doi: 10.1029/2018GL078082. Epub 2018 Jun 29.

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

Author information

1
Dipartimento di Geoscienze Università degli Studi di Padova Padua Italy.
2
Now at Dipartimento di Scienze della Terra Sapienza Università di Roma Rome Italy.
3
Istituto Nazionale di Geofisica e Vulcanologia Rome Italy.
4
Dipartimento di Scienze della Terra Sapienza Università di Roma Rome Italy.
5
LEMR, IIC, ENAC, EPFL Lausanne Switzerland.
6
Geology Department, Faculty of Sciences-Semlalia Cadi Ayyad University Marrakech Morocco.
7
Instituto Dom Luiz, Faculdade de Ciências Universidade de Lisboa Lisbon Portugal.

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 + CO2 fluid mixtures under temperature, fluid pressure, and stress conditions relevant for large-scale subsurface CO2 storage 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 + CO2 fluid 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 + CO2 mixtures.

KEYWORDS:

CO2 storage in basalts; fast mineral carbonation; fault reactivation

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