263 9. Defining high enthalpy geothermal drilling target with multi-physics Figure 9.6 First model obtained considering only the results of MT data inversion. Furthermore, on the field, the following surface manifestations have been observed: • CO2 degassing at the airport beach; • CO2 upwelling in a well in the center of the island. These observations indicate the likely existence of a permeable zone passing through these two points, forming a N150°E direction. This is the main direction observed on the island outcrops and also corresponds to the regional geodynamic direction (Famin et al., 2020). These elements lead to the presence of a possible sub-vertical fault passing through these points, defining a northeast boundary to the reservoir in the subsurface (Figure 9.7). Figure 9.7 First model, with a N150°E fault based on the field observation. The confidence on the existence of this fault is very low at this stage of the model construction.
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