A31 BOREHOLE CALIBRATION OF PS-WAVES FOR FRACTURE CHARACTERIZATION – PINEDALE FIELD WYOMING Summary 1 J. E. GAISER AND R. R. VAN DOK WesternGeco 1625 Broadway Suite 1300 Denver Colorado 80202 USA Converted-wave (PS-wave) 3D surveys where downgoing compressional (P) waves convert to upgoing shear (S) wave reflections provide a practical means to obtain S-wave anisotropy attributes for characterizing fractures. This is particularly important for delineating naturally fractured reservoirs by exploiting the unique characteristics of S-wave splitting in azimuthally anisotropic media. An important aspect of this process that is often missing is to use borehole fracture information for calibrating the anisotropy.


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