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Figure 1 shows a typical equipment setup and seismic ray paths in a borehole seismic survey. In a checkshot velocity survey, only the first directly arriving signals sensed by the downhole geophone are used. In vertical seismic profiling, both directly arriving and reflected signals are used. Graphics courtesy of R. J. Brewer.
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Figure 1 shows a typical equipment setup and seismic ray paths in a borehole seismic survey. In a checkshot velocity survey, only the first directly arriving signals sensed by the downhole geophone are used. In vertical seismic profiling, both directly arriving and reflected signals are used. Graphics courtesy of R. J. Brewer.