Geophysical surveys
Since 2012, we have been offering geophysical services adapted to the needs of the industry. Rather than promoting the use of a single method, we believe that geophysical planning should be done early in a project and involving the geophysicist.
Thus, we offer solutions with combined methods, tailor-made approaches according to the scale, the budget and the objectives of the projects. Contact us to share your challenges.
Seismic methods
The geostack team has unique expertise in seismic applied to near-surface settings (< 100 m below the surface). With an acquisition system designed specifically by its technical team and inspired by university research, we have participated in a large number of characterization projects at different scales for industrial, academic and government partners. We are equipped for projects of all sizes and are very agile in adapting to your needs and meeting your objectives.
Rapid deployment
Three-component towed geophones
Accelerated mass or vibrating source
Yield up to 3 km/day on motorable road
Summer and winter operation
Used for seismic reflection and MASW2D surveys
Flexible deployment
Use of regular or accelerated sledgehammer or dynamite as needed
Deployment of up to 48 measurement stations for seismic refraction or MASW surveys
Deployment of up to 156 three-component wireless stations for high-resolution combined seismic
Operation summer and winter, in all types of environment
Seismic refraction
Ideal for sites with unconsolidated deposits <20m thick
Allows bedrock surface mapping
Provides clues about the presence of fluid and the quality of the rock
Layer or tomography interpretation of Vp velocities
Seismic reflection
Ideal for depths 10 - 100m
Often used for bedrock mapping
Allows mapping of Vs
Allows to differentiate the types of unconsolidated deposits (ex: sand vs clay)
MASW-1D
Provides a vertical profile of Vs for the site investigated
Deployment possible in urban or remote areas
Possibility of coupling with another seismic method to increase control over interpretation
MASW - 2D
Ideal for depths 0 – 30m
Allows mapping of stratigraphic units
Can be produced at the same time as seismic reflection
Useful for hydrogeological and geotechnical characterization
Vertical seismic profile ( downhole )
Deployment in an existing borehole
Allows high vertical resolution of seismic velocities P and S
Use of a three-component sensor for better identification of propagation modes
Electrical methods
Often used in addition to the seismic methods that we deploy, the electrical methods make it possible to discriminate the electrical conductivity (or resistivity) contrasts of the materials of the subsoil and of the fluids present. By performing electrical resistivity tomography (ERT) and induced polarization (IP) acquisitions, we are able to analyze, interpret and integrate this data to provide added value to your projects.
Electrical resistivity tomography (ERT)
Allows you to identify and map the presence of possible contamination
Can be operated on long lines in remote or difficult to access areas
Ideal for depths 10 - 60m
Allows mapping of stratigraphic units
Induced polarization tomography (IP)
Allows to image the presence of conductors
Can be combined with electrical resistivity tomography in simultaneous measurements
Can be operated on long lines in remote or difficult to access areas
Spontaneous polarization (SP)
Maps the presence of thermal gradient
Allows to identify areas of change in fluid pressure in the ground (eg flow)
Ideally combined with other geophysical measurements
Electromagnetic methods
We have the expertise to deploy high-performance methods for mapping structures near the surface with ground penetrating radar or electromagnetic frequency methods. As some projects can benefit from high-performance electrical resistivity mapping at greater depth, we can offer methods such as TDEM in these cases. Write to us to find out more and share your challenges.
ground penetrating radar
Ideal for investigation depth up to 15m
Allows to interpret the continuity of the layers at the level of unconsolidated deposits
Allows you to precisely locate anomalies (e.g. buried reservoir)
Affected by the presence of clay soils
TDEM
Allows mapping of resistivity at great depth
Allows to interpret the continuity of the layers at the level of unconsolidated deposits
Enables rapid deployment over large areas
Frequency EM
Detection of conductors near the surface
Allows mapping of old infrastructures (ex: reservoir)
Easy, fast and inexpensive to deploy