PS-Wave Azimuthal Anisotropy – Seismic Properties for Fractured-Reservoir Management

C-22 PS-WAVE AZIMUTHAL ANISOTROPY – SEISMIC PROPERTIES FOR FRACTURED- RESERVOIR MANAGEMENT Abstract 1 Fractures can significantly influence the behavior of reservoir porosity and permeability resulting in numerous dry wells and higher production costs. In some cases fractures can dominate storage and flow mechanisms within the reservoir and in other cases they can create barriers. 3D converted wave (PS-wave) surveys provide complimentary surface-seismic information to help identify fracture properties early in the production history of a reservoir. Based on azimuthal anisotropy measurements PS-waves indicate fracture density and strike and are also sensitive to fracture dip because of their asymmetry. These large-scale