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Dissolution-induced preferential flow in a limestone fracture.

Jishan Liu1, Amir Polak, Derek Elsworth

  • 1School of Oil and Gas Engineering, The University of Western Australia, 39 Stirling Highway, Crawley WA 6009, Australia. jishan@cyllene.uwa.edu.au

Journal of Contaminant Hydrology
|June 7, 2005
PubMed
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Dissolution in rock fractures significantly alters fluid flow paths. Changes in water chemistry can cause permeability to decrease or dramatically increase, impacting groundwater movement.

Area of Science:

  • Geosciences
  • Hydrogeology
  • Geochemistry

Background:

  • Fluid flow in rock fractures is crucial for groundwater transport and resource management.
  • Dissolution processes can alter fracture geometry and significantly impact permeability over time.

Purpose of the Study:

  • To investigate how dissolution affects fluid flow paths and permeability in a limestone fracture.
  • To characterize the evolution of flow paths under changing water chemistry conditions.

Main Methods:

  • Conducted a 1500-hour flow-through test on an artificial limestone fracture.
  • Used sequential circulation of tap groundwater and distilled water.
  • Monitored differential pressure, mass fluxes, and employed X-ray CT imaging.

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Main Results:

  • Initial groundwater circulation led to a threefold increase in differential pressure, indicating reduced permeability.
  • Subsequent distilled water circulation caused an initial permeability decrease followed by a two-order-of-magnitude increase.
  • X-ray CT imaging revealed evolving flow path localization driving permeability changes.

Conclusions:

  • Fracture permeability is highly sensitive to dissolution and water chemistry.
  • Flow path evolution, driven by dissolution, can lead to spontaneous and significant changes in permeability.
  • A flow path-dependent model can simulate these complex behaviors.