A 2D full-waveform inversion using trench-deployed surfaceand VSP DAS data from CaMI FRS

Luping Qu, Wenyong Pan, Kristopher A. Innanen

Based on the previous surface-wave full-waveform inversion (FWI). A full-waveform inversion using trench-deployed surface waves and two wells’ Vertical Seismic Profiling(VSP) data was conducted to generate a high-resolution S- and P-wave velocity models of the near surface at Containment and Monitoring Institute Field Research Station in Alberta.In this preliminary inversion, a sequential inversion was conducted by firstly inverting Vs using surface-wave FWI, and secondly inverting Vp using the VSP FWI. There are two datasets collected in August 2022 for the main CO₂ monitoring line, line 13. They possess the same frequency range, with linear and low-dwell sweep, respectively. In this study, we compared these two datasets in detail. The inversion results are from the DAS data generated using the low-dwell sweep. Optical transport method was adopted to mitigate the cycle skipping problem mainly in surface wave inversion.