Abstract

Compressional and Shear wave velocities (Vp & Vs) have been measured on dry and NaCl saturated core plugs of Kessanapalli area of KG Basin under ambient as well as reservoir confining pressure conditions. The acoustic velocities have been found to increase with the increase in confining pressure and increase being most pronounced in the lower range of confining pressures. However when the core plugs are saturated with brine, the increase in velocities is not much as compared to that of dry plugs. The acoustic velocity data generated is then plotted which show simple linear relationships between Vp and Vs. For dry core plugs, the Vp-Vs curve passes through zero indicating a constant Compressional to Shear wave velocity ratio of 1.66. However, for NaCl saturated core plugs, the relationship between Vp and Vs under reservoir confining pressure conditions is found to be as follows: Vp (m/sec) = 1.55 Vs + 266