Full waveform inversion of VSP accelerometer data from the CaMI field site

Scott Keating, Matthew Eaid, Kristopher A. Innanen

The 2018 CaMI VSP survey provided a data-set suitable for creating a baseline subsurface model for later monitoring comparisons. Here, we implement elastic full waveform inversion to obtain an estimate of subsurface properties. Several challenges exist in applying full waveform inversion on the field data, including in particular a complex, difficult to characterize near-surface and discrepancies between geometrical spreading in 2D simulations and field data. We develop approaches for coping with these challenges, and obtain an inversion result that accurately reproduces the measured data. The inversion results in a subsurface model that is plausible, but difficult to verify.