f Azimuthal anisotropy analysis with P waves - The AVO-AVAZ approach

Amplitudes Versus Offset (AVO) techniques may be used for azimuthal anisotropy analysis and detection. For example, in a fractured medium the reflection coefficient variations with offset are different if the source-geophone line is striking parallel or perpendicular to the fractures. Due to the offset and azimuth distributions in a bin, a 3D acquisition scheme can affect the AVO response of a given lithological contrast. By analysing within one single bin, or within an elementary pattern, the azimuth versus offset variations of the amplitudes with a potar representation of the Amplitudes Versus Offset and of the Amplitudes Versus AZimuth (AVO & AVAZ), a 3D surface data set allows to directly detect the directions characteristic of the azimuthal anisotropy.