CREWES 2018 multi-azimuth walk-away VSP field experiment
Kevin W. Hall, Kevin L. Bertram, Malcolm B. Bertram, Kristopher A. Innanen, Donald C. Lawton
CREWES conducted a high-resolution multi-azimuth walk-away three-component vertical seismic profile (VSP) survey at the Containment and Monitoring Institutes Field Research Station (FRS) in the first week of September 2018. This data is primarily intended for use in full-waveform inversion (FWI) and modelling studies. The FRS has three wells, referred to here (from SW to NE) as the geophysics, injection and geochemistry wells. Four of the thirteen source lines were acquired with a 10 m VP spacing (bearings 0, 45, 90 and 135 degrees), and the remainder were acquired at 60 m VP spacing. The source was an Inova Univib running a linear 1-150 Hz sweep. In addition to existing permanent 3C geophones and fibre at the FRS, High Definition Seismic Corporation deployed a string of Inova 3C VectorSeis accelerometers in the geophysics well at a nominal 1 m spacing, from the surface to 324 m depth. The data are currently undergoing zero-offset and far-offset VSP processing. First-break picks sorted by offset and azimuth appear to confirm the presence of weak HTI anisotropy at the FRS, as observed on a single offset semi-circular walk-around VSP recorded in the injection well in 2015.