f Integrated Reservoir Characterization, Part 3 - the Petrophysical Basis

Theoretical and experimental results are utilized to estimate reservoir properties (porosity and permeability) distribution from impedance-derived compressional seismic velocities. Empirical relations link ultrasonic velocities to rock properties such as lithology, porosity and permeability at laboratory conditions. A theoretical-based model is employed to incorporate the effects of wave frequency and reservoir conditions (such as pressure, saturation, fluid properties and temperature) into the laboratory velocities-rock properties relations: Therefore, this approach enables us to integrate acoustic measurements from laboratory (ultrasonic) to borehole (sonic) to the reservoir scale.