Os informamos del próximo seminario organizado conjuntamente entre Geociències Barcelona-CSIC (GEO3BCN-CSIC) y la Facultat de Ciències de la Terra (UB) 

miércoles día 31/01/2024, a las 12:00h (CET), in situ al Geo3BCN-CSIC y online vía Youtube en el siguiente enlace: Online

realizado por:

Pilar Sánchez-Pastor, Geociències Barcelona (Geo3Bcn-CSIC).

Título: Monitoring geothermal reservoirs using seismic noise 

Abstract: Harvesting geothermal energy often leads to a pressure drop in reservoirs, decreasing their profitability and promoting the formation of steam caps. While steam caps are valuable energy resources, they also alter the reservoir thermodynamics. Accurately measuring the steam fraction in reservoirs is essential for both operational and economic perspectives. However, steam content estimations are very limited both in space and time since current methods rely on direct measurements within production wells. Besides, these estimations normally present large uncertainties. We introduce a pioneering method for indirectly sampling the steam content in the subsurface using the ever-present seismic background noise. We observe a consistent annual velocity drop in the Hengill geothermal field (Iceland) and establish a correlation between the velocity drop and steam buildup using in-situ borehole data. This application opens new avenues to track the evolution of any two-phase fluid in the crust with a surface-based and cost-effective method.