Fluid flow through rock fractures undergoing chemical interactions: 
experimental investigations with implications for EGS sustainability

Milsch, H.; Cheng, C.

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Fluid flow through rock fractures undergoing chemical interactions: experimental investigations with implications for EGS sustainability

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Milsch, H.
4.8 Geoenergy, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Cheng, C.
4.8 Geoenergy, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Milsch, H., Cheng, C. (2022): Fluid flow through rock fractures undergoing chemical interactions: experimental investigations with implications for EGS sustainability - Proceedings, European Geothermal Congress 2022 (Berlin, Germany 2022).

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5015581

Abstract

This contribution outlines the protocol, results, and implications of several long-term flow-through experiments conducted with one pure quartz sandstone sample containing a tensile fracture and three slate samples with a saw-cut fracture. Both rock types display very low matrix permeability. The samples were flown through intermittently for 1~4 months at constant temperature and confining pressure. Fracture permeability was determined throughout the experiments, accompanied by a complete ICP-OES chemical analysis of the effluents in defined time intervals. For the slate samples, we also explore the effects of fluid chemistry on permeability changes by flowing with both deionized water and a 0.5 M NaCl solution.