Inversion of fracture properties based on frequency dependent seismic AVAZ attributes

Fracture systems are often characterized by using seismic anisotropy. Only fracture density and azimuth can be estimated with the limitation of traditional equivalent medium theories however frequency-dependent anisotropy is very sensitive to the scale of fractures. Recent studies have shown the potential of using frequency dependent seismic attributes to estimate reservoir seismic anisotropy. In this study, the objective of the inversion is to estimate fracture properties including fracture strike, fracture density, fracture length and fluid type from seismic frequency dependent amplitude versus incident angle and azimuth (AVAZ) data. Obtain the solution by genetic algorithm (GA) simulation and then characterize the uncertainty in the inversion results, respectively and analysis posterior probabilities influenced by prior probabilities based on Bayesian theory.