P113 ROBUST ESTIMATION OF ANISOTROPY PARAMETERS FROM CORRELATION OF PP AND PS IMAGES AND WELLS O. MIKHAILOV 1 and E. F. HERKENHOFF 2 Summary Isotropic imaging of 4C data at Alba has resulted in significant mismatches between reflector depths in PP and PS images and the depths determined from well control (Mikhailov et al. 2001). These mismatches indicate that the subsurface at Alba is effectively anisotropic. We present a simple procedure for estimating anisotropy parameters of the effective TI medium based on these depth mismatches. Our analysis relies primarily on near-offset information and therefore may be more robust than methods


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