Core Lab operates a full service geomechanics laboratory that provides customers with multi-frequency
acoustic velocities and elastic properties for revolutionary seismic and log calibration.
Low-frequency determination of the behavior of reservoir rocks under changing fluid states and reservoir
pressures establishes correlations between static and dynamic data.
Frequency effects: Both P-wave (compressional) and S-wave (shear) velocities increase as
frequency increases from low frequency to seismic to logging and ultrasonic frequencies. Calibration with only
ultrasonic data results in overestimation of velocities at lower frequencies. Elastic moduli change dramatically
with frequency whereas Poisson's ratio varies less.
Correlations between static and dynamic elastic constants are difficult to establish because they depend on many
reservoir-specific variables. Without core data acquired at low frequencies in the lab, reservoir models are
highly variable and subjective.