Abstract
Summary A shallow VSP survey was conducted in the University of Calgary Test Well using an EnviroVibe vibrator source and a downhole clamping 3C geophone. The goal was to evaluate VSPs for imaging thin-bed stratigraphy in the nearsurface environment. Two offset VSPs were obtained with the vibrator located 15m and 30m south of the wellhead. The vertical component data were subjected to wavefield separation to remove down-going P and S waves, and laterarriving (low-velocity) up-going and down-going events. The residual up-going P-wave reflections were further processed and mapped using a simplified VSP/CDP procedure. Features on the resulting reflectivity maps corresponded closely to the near-surface stratigraphy of the Paskapoo formation close to the well as identified by sonic velocity, resistivity, and natural gamma-ray logs. The project confirmed that the EnviroVibe vibrator used in nearsurface VSP surveys produces enough high-frequency energy to be effective for imaging relatively thin lithological beds in the upper 100m.
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