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In situ diffusion experiment in granite: phase I.

P Vilks1, J J Cramer, M Jensen

  • 1AECL, Whiteshell Laboratories, Pinawa, Manitoba, Canada R0E 1L0. vilksp@aecl.ca

Journal of Contaminant Hydrology
|February 25, 2003
PubMed
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In situ diffusion experiments in sparsely fractured rock (SFR) revealed unique iodide concentration patterns. These findings highlight changes in rock properties under stress, informing future diffusion studies.

Area of Science:

  • Geosciences
  • Hydrogeology
  • Rock Mechanics

Background:

  • Understanding solute transport in sparsely fractured rock (SFR) is crucial for geological disposal and resource management.
  • Previous studies lacked in situ data on diffusion processes within intact crystalline rock under realistic stress conditions.

Purpose of the Study:

  • To develop and validate a methodology for estimating diffusion parameters in SFR.
  • To investigate diffusion processes in highly stressed crystalline rock at a depth of 450 m.

Main Methods:

  • Conducted four in situ diffusion experiments using an iodide tracer over a two-year period.
  • Employed laboratory studies to complement in situ findings.
  • Utilized the MOTIF code for estimating diffusion coefficients and permeability.

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Main Results:

  • Estimated rock permeability at 2 x 10(-21) m(2) and effective diffusion coefficients ranging from 2.1 x 10(-14) to 1.9 x 10(-13) m(2)/s.
  • Observed a characteristic "dog leg" diffusion profile near the borehole, suggesting stress-induced changes.
  • Documented alterations in physical properties of rock samples when removed from high-stress environments.

Conclusions:

  • In situ diffusion behavior in SFR is influenced by stress redistribution and borehole effects.
  • Laboratory measurements may not fully represent in situ rock properties under high stress.
  • Lessons learned from Phase I informed the initiation of a Phase II program for enhanced understanding of diffusion in SFR.