GeoVista - Version DPS -Downhole Sonde Software

The Geovista Downhole P&S (DPS) probe is used to log formation compressional (P) and shear (S) wave propagation velocities. It is particularly effective in "slow" formations where shear velocity is lower than borehole-fluid velocity. Formation P&S wave slowness are among the parameters required to estimate rock properties at the site investigation stage, be it for foundations or civil engineering projects such as dams. The Geovista DPS probe comes with one transmitter and two receivers. The transmitter is designed to excite a dispersive flexural mode which propagates at a velocity close to that of the formation shear velocity. It is currently the only technique available in slow formations where shear velocity is lower than borehole fluid velocity. This method does not require clamping to achieve acoustic coupling.