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.

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Rapid deployment

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Three-component towed geophones

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Accelerated mass or vibrating source

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Yield up to 3 km/day on motorable road

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Summer and winter operation

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Used for seismic reflection and MASW2D surveys

Flexible deployment

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Use of regular or accelerated sledgehammer or dynamite as needed

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Deployment of up to 48 measurement stations for seismic refraction or MASW surveys

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Deployment of up to 156 three-component wireless stations for high-resolution combined seismic

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Operation summer and winter, in all types of environment

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Seismic refraction

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Ideal for sites with unconsolidated deposits <20m thick

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Allows bedrock surface mapping

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Provides clues about the presence of fluid and the quality of the rock

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Layer or tomography interpretation of Vp velocities

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Seismic reflection

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Ideal for depths 10 -  100m

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Often used for bedrock mapping

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Allows mapping of Vs

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Allows to differentiate the types of unconsolidated deposits (ex: sand vs clay)

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MASW-1D

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Provides a vertical profile of Vs for the site investigated

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Deployment possible in urban or remote areas

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Possibility of coupling with another seismic method to increase control over interpretation

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MASW - 2D

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 Ideal for depths 0 – 30m

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Allows mapping of stratigraphic units

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Can be produced at the same time as seismic reflection

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Useful for hydrogeological and geotechnical characterization

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Vertical seismic profile ( downhole )

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Deployment in an existing borehole

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Allows high vertical resolution of seismic velocities P and S

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Use of a three-component sensor for better identification of propagation modes

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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.

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Electrical resistivity tomography (ERT)

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Allows you to identify and map the presence of possible contamination

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Can be operated on long lines in remote or difficult to access areas

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Ideal for depths 10 - 60m

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Allows mapping of stratigraphic units

Induced polarization tomography (IP)

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Allows to image the presence of conductors

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Can be combined with electrical resistivity tomography in simultaneous measurements

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Can be operated on long lines in remote or difficult to access areas

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Spontaneous polarization (SP)

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Maps the presence of thermal gradient

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Allows to identify areas of change in fluid pressure in the ground (eg flow)

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Ideally combined with other geophysical measurements

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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.

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ground penetrating radar

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Ideal for investigation depth up to 15m

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Allows to interpret the continuity of the layers at the level of unconsolidated deposits

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Allows you to precisely locate anomalies (e.g. buried reservoir)

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 Affected by the presence of clay soils

TDEM

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Allows mapping of resistivity at great depth

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Allows to interpret the continuity of the layers at the level of unconsolidated deposits

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Enables rapid deployment over large areas

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Frequency EM

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Detection of conductors near the surface

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Allows mapping of old infrastructures (ex: reservoir)

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Easy, fast and inexpensive to deploy