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Hydrophysical Logging » RAS Inc. - Integrated Subsurface Evaluation

Integrated Subsurface Evaluation

Hydrophysical Logging

Hydrophysical Logging (click to enlarge)


The RAS hydrophysical tool is the only multi-fluid electrical conductivity/ temperature sensor instrument, developed as a result of our application in hundreds of wells as well as numerous laboratory and numerical simulations conducted in conjunction with national DOE and USGS laboratories.

As a result, the RAS system collects superior data more quickly, allowing more sensitive and accurate data analyses.

Hydrophysical Logging

RAS provides an advanced method called hydrophysical logging for the hydraulic characterization of aquifers.

Data acquisition involves logging with RAS’s proprietary multi-sensor tool which measures temperature and fluid electrical conductivity. Logging is conducted during procedures replacement of the native wellbore fluids with environmentally safe deionized water. The formation fluids contrast electrically with the deionized water and provide a means of establishing the location of formation fluids and quantifying flow rates in-situ.

The RAS hydrophysical tool is the only multi-FEC/T sensor tool available for the purpose of testing with this technique. Our instrumentation package has been developed as a result of extensive field experience as well as numerous laboratory/numerical simulations conducted in conjunction with several national DOE and USGS laboratories.

When the hydrophysical method is applied in multiple well investigations, critical data regarding intermediate to large scale permeability and aquifer parameters may be acquired. This information is critical for analyzing the extent of contamination, developing effective remediation plans, understanding groundwater system hydraulics, and calculating aquifer volumetrics/movement.

Hydrophysical Logging Summary

  • Technique applicable in a wide variety of hydrogeologic settings: low to high yield bedrock, alluvial/porous settings, karst and volcanic aquifers.
  • Both open boreholes and completed wells can be characterized (2 inch minimum diameter).
  • Water bearing intervals are identified to one borehole diameter resolution.
  • A wide range of interval specific flow rates can be quantified (0.01 to 100+ gpm).
  • Flow rates can be assessed independent of borehole diameter.
  • Wellbore flow is evaluated under ambient or stressed aquifer conditions.
  • A larger volume of aquifer is investigated than by traditional packer testing.
  • Interval specific water quality can be evaluated.
  • Single and cross-hole aquifer characterization (i.e. larger scale hydraulic connections between two or more wells) can be conducted.
  • Data output equivalent to packer testing (Dp and Dq) for transmissivity and hydraulic conductivity can be calculated.