106 Well seismic surveying and acoustic logging gain law on a short window (30 ms) was used to highlight the reflectors close to the surface, which had the effect of increasing the amplitude of the reflectors. It can be noted that the VSP allows a calibration of the surface seismic in the depth range (25 to 85 m) where the measurements were made, but also under the well. The VSP stacked trace highlights reflectors that appear at times (two way times) greater than 80 ms and are below the well. Seismic reflectors can be seen beyond 100 ms. This example illustrates the predictive role of VSP: prediction under the well. Figure 4.2 Tying a seismic section using VSP.
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