A novel concept for enhanced geothermal systems (EGS) was proposed recently that would use supercritical CO2 (sc-CO2) instead of water as heat transmission fluid. Modeling studies have indicated that sc-CO2 has very favorable properties (low viscosity and large expansivity) for heat extraction and transmission to the land surface. The present paper considers the CO2-rich geothermal system at Mt. Amiata in Tuscany (Central Italy) as a potential analogue for studying geochemical changes in the peripheral and outer zones of an EGS operated with sc-CO2 (CO2-EGS). Field observations of mineral alteration and fluid chemistry are used to constrain reactive chemical transport simulations, and to obtain insights into rock-fluid interactions in a CO2-EGS system.
Modeling gas-water-rock interactions at Mt. Amiata geothermal field (Italy)
Gherardi F;
2010
Abstract
A novel concept for enhanced geothermal systems (EGS) was proposed recently that would use supercritical CO2 (sc-CO2) instead of water as heat transmission fluid. Modeling studies have indicated that sc-CO2 has very favorable properties (low viscosity and large expansivity) for heat extraction and transmission to the land surface. The present paper considers the CO2-rich geothermal system at Mt. Amiata in Tuscany (Central Italy) as a potential analogue for studying geochemical changes in the peripheral and outer zones of an EGS operated with sc-CO2 (CO2-EGS). Field observations of mineral alteration and fluid chemistry are used to constrain reactive chemical transport simulations, and to obtain insights into rock-fluid interactions in a CO2-EGS system.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
