Abstract

Analysis of prestack amplitude variation with offset and azimuth (often called “azimuthal AVO analysis” or “AVAZ”) is one of the most effective tools for seismic characterization of fractures and in-situ stress field. The main advantage of amplitude methods compared to traveltime inversion is their high vertical resolution that makes AVO analysis applicable to relatively thin reservoirs. Also, body-wave amplitudes are highly sensitive to seismic anisotropy and, in particular, to azimuthal velocity variations associated with vertical fracture systems and nonhydrostatic stresses.

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