27 1. Shear velocity measurement in boreholes each slice must contain a minimum of 3 measurement points, ideally 4 or 5 (see Figure 1.12). As a result, it is not recommended to carry out downhole acquisition with 2 receivers simultaneously to perform velocity calculations based on these 2 measurements. Finally, we also note that a downhole analysis, even with a metric measurement interval, is more integrative than a crosshole measurement. Figure 1.10 S downhole, up to 50 m in depth (InterPacific). Figure 1.11 Illustration of a downhole (DH) analysis in P and S-waves based on 4 slices.
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