269 9. Defining high enthalpy geothermal drilling target with multi-physics interpretation steps, the model underwent a phase of global consistency, during which many modifications were made to better align with reality. Among these, a final chimney was added in the southern part of the island to explain a high value observed in the magnetotelluric data at this location, which also correlates with visible scoria ejections on the surface (Figure 9.14). Figure 9.14 EW2 cross-section (see Figure 9.4) highlighting a potential material upwelling zone. The orange lines mark the boundaries of this “chimney”. The geological model is then ready (Figure 9.15). It is consistent with the surface geological map and respects the general geometries observed. Some simplifications were made, notably the choice to assimilate the entire portion of Grande Terre within the model to volcanic substratum, even though in reality the area is covered by more recent minor lava flows. Since the project focuses primarily on Petite Terre, approximations at the edge of the model are not of major importance. The same applies to the geometry of the reservoir, which is, of course, largely extrapolated where data is absent. With the finalized 3D geological model, the next step is to create a hydrothermal model. This stage helps determine the heat flow behaviours based on the geometry created, in order to estimate the most favorable region for the location of an initial exploration well.
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