Time-lapse Seismic Anisotropy Analysis for CO2 Geosequestration Using 3D 3C VSP Data

We present a quantitative analysis of the change of the seismic anisotropy observed after CO2 injection within the CO2CRC Otway Basin Project. We invert two 3C 3D VSP datasets for the density scaled stiffness tensors and compute the difference of the resulting compliance tensors. The results are in good agreement with the observed changes in the time-lapse zero-offset VSP experiments and with the available sonic log data.