M-30 INVERSION OF VSP FIRST ARRIVAL TRAVEL- TIMES FOR ANISOTROPY PARAMETERS Abstract 1 First arrival traveltimes from a multi-offset Vertical Seismic Profile (VSP) in the Alberta Basin were modelled to determine the Thomsen anisotropy parameters of clastic Mesozoic rocks. Computed traveltime data were matched successfully to those observed using either a geologically controlled or arbitrarily divided horizontally stratified earth. Although the solution was found to be non-unique the average velocity anisotropy was found to be about 18%. An empirical relationship was developed between gamma-ray count and the anisotropy parameter ε that was used successfully in the modelling. Introduction First arrival


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