Abstract Surface-based seismic field data were acquired through distributed acoustic sensing (DAS) measurements by utilizing vertical loop configurations of a tight-buffered fiber-optic cable at the Aquistore CO2 storage site. A continuous run of the cable was buried in an 80 cm deep trench with vertical fiber-loops attached to acrylonitrile butadiene styrene (ABS) pipes that were deployed in shallow, 3 m, drillholes to record steep-angle P-wave reflections from over 400 dynamite shots. The capabilities and potential of DAS fiber loops for surface-based seismic surveys in such an environment have been evaluated. The DAS strain measurements were converted to particle velocity and compared to geophone data that were acquired concurrently; stacked sections were focused on the deeper P-wave reflections in the 0.7 – 2.0 s time window. Estimated average phase response shows that the fiber loop converted-velocity DAS data is ~160° phase-rotated compared to the geophone data. Furthermore, well-tie results for the DAS fiber-loop and the geophone data show 66% and 78% correlation, respectively. The P-wave reflection imaging results demonstrate that the DAS fiber loops can provide a comparable alternative to the geophones in this case.
Asafuah et al. (Mon,) studied this question.