Maybe the greatest value of technology in geothermal energy issues can be assessed in<br>terms of its ability to reduce risk. The present contribution only addresses subsurface matters<br>and, even more specifically, how naturally fractured geothermal reservoirs could be more<br>efficiently tapped and developed in the framework of EGS operations. Lastly, among the two<br>aspects which have to be investigated in EGS projects, i.e. temperatures and flow rates, only<br>the latter is considered here, assuming that the isotherm geometry can, for instance, be<br>constrained by MT (magneto-telluric) surveys looking for electrically conductive altered rocks<br>(clay alteration zones) or other techniques.<br>The ability to characterize NFSs (natural fracture systems) in the early field development<br>stage of an EGS project reduces economic risk because it enables the development team to<br>determine optimal well placement and trajectories. Characterizing, tapping and developing a<br>geothermal NFS, as well as predicting the heat and fluid flows in response to hot water<br>extraction and cooled water re-injection, is a challenging task that span multiple disciplines<br>and multiple scales.


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