Borehole seismic surveys provide vital depth and velocity parameters needed to link surface seismic data with downhole log and well data. Furthermore they can deliver high-resolution subsurface images, detect anisotropy caused by natural fractures and help to monitor fluid movement depending on the chosen survey geometry.
A borehole seismic survey, whether simple checkshots or a more complex VSP, is usually part of the initial data acquisition program in exploration and appraisal wells, but it is not uncommon that only the depth-time data from such a survey is used in seismic interpretation. This paper is intended for geoscientists working on subsurface projects to highlight information that can be gleaned from a VSP wavefield in addition to only a depth-time correlation.
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