267 9. Defining high enthalpy geothermal drilling target with multi-physics These points provide an orientation for the faults. To model them in GeoModeller, the software requires a dip value. Based on the apparent dips observed in the section (Figure 9.10) and the angle assumed relative to the fault azimuth, obtained from surface observation points (Figure 9.11), it is possible to assign a real dip to the model before creating 3D surfaces (Figure 9.12). Figure 9.12 The two normal faults modelled under Petite Terre. 9.3 Gravimetric data integration A total of 116 gravimetric measurement points acquired during the Pajot et al. (2007) campaign were inverted to obtain a density model. The inversion is performed jointly with the inversion of MT data, using a global correlation of resistivity and density structures as a constraint. The density structure results (Figure 9.13) show a negative anomaly at the surface between the two interpreted faults forming a small graben. The main direction remains the same as the one observed in the previous paragraph, providing additional evidence supporting the presence of these faults, which were not visible in the resistivity inversion.
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