2022/06/03 by Saeed Mahmoodpour, Mrityunjay Singh, Mahmoodpour, Saeed +9
Energy · Engineering · Environmental Science · Physics and Astronomy · #CO2 Sequestration and Geologic Interactions #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Geophysics (physics.geo-ph) #Geothermal Energy Systems and Applications #Hydraulic Fracturing and Reservoir Analysis #physics.flu-dyn #physics.geo-ph
paper · pdf · doi:10.48550/arxiv.2206.01830
29 pages, 9 figures
arxiv created 2022/06/03 · openalex publication_date 2022/06/03 · arxiv updated 2022/06/07 · openalex created_date 2022/06/13 · openalex updated_date 2026/07/28
Porosity and permeability alteration due to the thermo-poro-elastic stress field disturbance from the cold fluid injection is a deciding factor for longer, economic and safer heat extraction from an enhanced geothermal system (EGS). In the Soultz-sous-Forêts geothermal system, faulted zones are the main flow paths and the resulting porosity-permeability development over time due to stress reorientation is more sensitive in comparison with the regions without faulted zones. Available operational and field data are combined through a validated numerical simulation model to examine the mechanical impact on the pressure and temperature evolution. Results shows that near the injection wellbore zones, permeability and porosity values are strongly affected by the stress field changes and the permeability changes will affect the overall temperature and pressure of the system demonstrating a fully coupled phenomenon. In some regions inside the faulted zones and close to the injection wellbores, the porosity doubles whereas permeability may enhance up to 30 times. From the sensitivity analysis on the two unknown parameters from the mechanical aspect is performed and results shows that only one of the parameters impacts significantly on the porosity-permeability changes. Further experimental and field works on this parameter will help to model the heat extraction from the Soultz-sous-Forêts and elsewhere more precisely than before.