3D fracture assessment using AVAz and layer-stripping approach

Abstract

Subtle variations in P-wave multi-azimuthal seismic reflections can be used to map lineations in a horizon, representing seismic amplitude changes as a result of the presence of vertical fractures. This paper shows how the amplitude maps were used to determine if layers were fractured or not, and presents a layer-stripping approach to reduce the interference of upper-horizon fracture effects on lower horizons, allowing greater clarity in mapping the deeper horizons. The technique is demonstrated using physical modelling data.