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Related Experiment Videos

Modeling multiscale heterogeneity and aquifer interconnectivity.

Christopher J Proce1, Robert W Ritzi, David F Dominic

  • 1Department of Geological Sciences, Wright State University, Dayton, OH 45435, USA.

Ground Water
|October 2, 2004
PubMed
Summary

Indicator geostatistics effectively modeled multiscale aquifer heterogeneity, revealing geologic structures create high-permeability pathways. This overcomes borehole data bias and matches hydraulic study findings.

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Area of Science:

  • Geosciences
  • Hydrogeology
  • Geostatistics

Background:

  • Characterizing complex aquifer heterogeneity is crucial for understanding groundwater flow.
  • Borehole log data often contain biases that can affect heterogeneity modeling.
  • Regional buried valley aquifer systems exhibit hierarchical geological organization.

Purpose of the Study:

  • To develop and apply a methodology for characterizing and modeling multiscale heterogeneity in aquifers.
  • To circumvent biases common in borehole log data.
  • To investigate the interconnectivity of higher-permeability pathways within a complex aquifer system.

Main Methods:

  • Utilized indicator geostatistics to model multiscale heterogeneity.
  • Applied the methodology to the Spiritwood Aquifer in North America's western glaciated plains.

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  • Statistically characterized sedimentary architecture at large and small scales.
  • Formulated indicator correlation models and simulated multiscale realizations.

    • Main Results:

    • The methodology successfully characterized hierarchical heterogeneity with facies assemblages and facies types.
    • Indicator correlation models revealed geologic structures create significant interconnectivity of higher-permeability pathways.
    • These pathways span the realization despite the low proportion of high-permeability facies, exceeding the percolation threshold.
    • Simulated interconnectivity aligns with prior hydraulic and geochemical study results.

    Conclusions:

    • The developed indicator geostatistics methodology effectively models multiscale aquifer heterogeneity and its impact on groundwater flow.
    • Geologic structures play a vital role in creating interconnected high-permeability pathways, influencing aquifer behavior.
    • The findings support previous hydraulic and geochemical interpretations of the Spiritwood Aquifer system.