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Aquitard layers effectively isolate deep groundwater, showing negligible transfer over millions of years. This research is crucial for assessing geological waste storage safety.

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Area of Science:

  • Geochemistry
  • Hydrogeology
  • Environmental Science

Background:

  • Aquitards, low-permeability rock layers, are considered for toxic waste storage.
  • Evaluating aquitard isolation properties is critical for safe reservoir design.

Purpose of the Study:

  • Investigate long-term groundwater mobility between aquifers separated by an aquitard.
  • Assess the isolation capacity of a Paris Basin aquitard using geochemical tracers.

Main Methods:

  • Utilized helium isotopes (radiogenic 4He and primordial 3He) as geochemical tracers.
  • Analyzed groundwater from Trias sandstone and Dogger carbonate aquifers in the Paris Basin.
  • Examined a ~600m thick aquitard composed of shales and clays.

Main Results:

  • The Trias aquifer accumulates significant helium from crust and mantle sources.
  • The overlying Dogger aquifer is stagnant, indicating excellent isolation from the Trias.
  • Demonstrated negligible diffusive mass transfer across the aquitard over millions of years.

Conclusions:

  • Aquitard layers provide effective long-term isolation for groundwater reservoirs.
  • Diffusive mass transfer through aquitards is minimal, contrary to some models.
  • Cross-formational groundwater flow in basins is primarily controlled by faults, not diffusion through aquitards.