Estimation of fluid mobility from frequency dependent azimuthal AVO - a modelling study

摘要

Azimuthal amplitude-versus-offset (AVOZ) data can contain abundant information on fracture properties, lithology and fluid saturation, but procedures for interpretation in terms of such properties remain relatively poorly developed. This paper develops recently developed rock physics model based inverse schemes with a particular emphasis on accounting for the frequency-dependence of anisotropy, which is believed to be important in fractured reservoirs. Frequency-dependent anisotropy is expected to be influenced by fluid mobility, and determining this parameter from seismic data would be advantageous. The method is applied to a range of models, and it is shown that under relevant conditions it is theoretically possible to obtain fluid mobility information from AVOZ.