246 Geophysics in Geothermal Exploration Compared to raw statistics such as variance, the ellipse fitting imposes anisotropy to be organized and oriented. It acts as a powerful denoising, and the orientation of the major axis is a key QC, supposed to be aligned with the fault/fracture orientations. For each source of information, the computation is performed in 3D, then extracted at key levels to evaluate the results, as illustrated in Figure 8.3. Figure 8.2 Ellipse fitting to extract the anisotropy intensity and orientation. Figure 8.3 Ellipse fitting, a powerful tool to combine maps into anisotropy estimation.
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