74 Well seismic surveying and acoustic logging The results obtained therefore show that if the data are correctly sampled, a conventional VSP processing sequence can be adapted to downhole data. The VSP stacked trace can thus be used to tie a seismic reflection profile as shown in Figure 2.19. Figure 2.19 Tying of a VHR seismic section on the downhole stacked trace (EDF document). 2.6 Conclusion The main applications of well seismic surveying are: • Establishing the time-depth relationship at the well position • Establishing a velocity model (P and/or S) • Tying seismic refraction profiles • Validating static corrections
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