Shear-Wave Anisotropy from Far Offset VSP

B017 Z-99 SHEAR-WAVE ANISOTROPY FROM FAR Abstract 1 Two types of shear waves have been recorded from a land VSP survey at zero and far offset locations with a vertical Vibroseis source. The two shear waves polarized normal to the compressional waves traveled at different velocities indicative of possible shear-wave splitting. Shear-wave anisotropic parameter γ was estimated from the traveltime data which ranges mostly from 6 to 15%. These results show that zero and offset VSP data can be used to detect and evaluate formation anisotropy. Introduction OFFSET VSP RAN ZHOU XIAOMIN ZHAO AND DAVID J. DUSHMAN VSFusion 16430 Park