Patent ID: 8607628

Claim:
A method for determining a property of a formation, the method comprising: disposing a well-logging tool in a borehole within the formation, the tool comprising a device for varying temperature of the formation and at least two acoustic logging probes located symmetrically along the tool length relative to the device for varying temperature of the formation, moving the well logging tool in the borehole and performing continuous acoustic logging while simultaneously and continuously varying the temperature of the formation and measuring (i) temperature of the formation and (ii) velocity and attenuation of Stoneley waves generated by the acoustic logging probes, obtaining the measured velocity and the measured attenuation of the Stoneley waves as functions of the measured temperature of the formation, and determining from the functions at least one property selected from the group consisting of: relative phase permeability of the formation, fluid viscosity within the formation, and viscous flow activation energy within the formation.