Compressional and shear wave velocities are measured with NER's PS² ultrasonic transducer assembly.  These assemblies easily measure one compressional and two shear wave velocities at confining pressures to 15,000 psi and pore pressures to 10,000 psi.  Rugged coreholder assemblies accommodate core diameters to 1.5 inches.

The AutoLab system is designed to allow for both two electrode and two-four electrode resistivity measurements as a function of frequency, effective pressure, and temperature.  Routinely, complex resistivity is measured over at frequencies between 0.01 Hz and 500 kHz.

Since the system is servo-controlled several unique capabilities are possible.  One key technique is a new transient technique for the measurement of permeability.  The method involves control of a complex transient and pore pressure at the upstream side of the sample while monitoring the pore pressure response to the downstream side.  The permeability is measured by fitting the response to analytical solutions.  An important feature of the permeability technique is its short duration (10 seconds) and that it involves only a small perturbation in pore pressure above the mean value.  The characteristics are significant advantages over traditional methods.