Anisotropic Traveltime and Polarisation Tomography of 3D VSP Data

M-11 ANISOTROPIC TRAVELTIME AND POLARISATION TOMOGRAPHY OF 3-D VSP DATA A.J. CHERRETT 1 2 and S.C. SINGH 1 3 Abstract 1 1 LITHOS Bullard Laboratories Department of Earth Sciences University of Cambridge Cambridge CB3 0EZ UK 2 Total Fina Elf GRC 3 IPG Paris The results of a simultaneous tomographic inversion of traveltime and polarisation data from a multicomponent 3-D walkaway VSP experiment in the North Sea are shown. Despite the presence of significant levels of noise and poor aperture ray coverage laterally heterogenous structures are imaged and robust measurements of seismic anisotropy are obtained both at depth in the