A field study of azimuthal seismic anisotropy in fractured carbonates at Canyon Lake, central Texas

摘要

Because many important reservoirs lie in faulted and fractured carbonate rocks, we are encouraged by the correlation of seismic anisotropy and fractures in this carbonate outcrop study. P-wave traveltime and surface-wave particle-motion plots both showed a direct link between azimuthal seismic anisotropy and aligned fractures at the Canyon Lake study site. The P-wave analysis, most applicable to subsurface studies, indicated 32.3% and 14.7% velocity anisotropy in the top two layers at the study site, respectively. The P-wave fast direction aligned with the observed dominant fracture strike.