Halliburton integrates 3-D VSP data with surface seismic and well-logging data to define and describe formation properties and identify other reservoir details with the greatest amount of resolution. The results give operators a better understanding of the best ways to exploit the reservoir.
Over time, a 3-D VSP can more than pay for itself
by enabling more accurate drilling decisions using fewer wells to
produce the reservoir.
3-D VSP Benefits and Applications
(From http://www.halliburton.com)