Modelling the Effect of Frequency Dependent Anisotropy on Azimuthal AVO Analysis

P095 Modelling the effect of frequency dependent anisotropy on azimuthal AVO analysis. Abstract 1 Evidence suggests that hydrocarbon saturated zones exhibit anomalously high values of attenuation and we are therefore interested to understand this phenomenon. We consider seismic wave propagation through multi-layered models containing one layer which shows strong attenuation. The dominant frequency of the P-wave reflected from the top of this layer is generally shifted with respect to other arrivals with the shift depending strongly on the AVO class. Reflections from class III gas sand tend to be shifted to lower frequency while those from class I water sands