VSP survey has an advantage of shooting at earth surface and receiving in borehole that can bypass surface interference waves. With VSP data, especially the data obtained by adoption of multiple level receivers, formation velocity of higher quality can be calculated, which in turn leads to more reliable petrophysical parameters (such as ratio of P-waves and S-waves, Poisson's ratio, etc). With well data, one can infer the presence of hydrocarbons through an analysis of the variability of these parameters in formation. The results will be helpful for future seismic data interpretation and hydrocarbon test.
Geophysical Prospecting For Petroleum