A 3D Seismic Survey For Shallow Aquifer Mapping

A high-resolution 3D seismic survey was undertaken to map shallow aquifers near Calgary, Alberta. The survey was 500m x 300m in area, with shot and receiver lines in an orthogonal<br>geometry using 50m line separation. Shots and geophones were spaced at 10m intervals along source and receiver lines, respectively. The surface source used was an 18,000lb EnviroVibe<br>sweeping over a 10Hz to 180Hz range. The survey yielded excellent reflections with a dominant frequency of 50Hz. One high-amplitude west-dipping reflection, occurring between depths of<br>250m and 450 m, was mapped over the survey area. The event is correlative to a Tertiary sandstone which may be a regional aquifer.