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Advancements in coupled processes numerical models: Upscaling aperture fields using spatial continuity.

Gonçalo Benitez Cunha1,2, Christopher Ian McDermott1, Alexander Bond3

  • 1School of Geosciences, The University of Edinburgh, The King's Buildings, James Hutton Road, Edinburgh EH9 3FE, UK.

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This summary is machine-generated.

Incorporating spatial continuity into fracture aperture models improves fluid flow simulations in geological media. This method enhances accuracy, especially with coarser mesh resolutions, for better resource management and energy exploration.

Keywords:
Earth sciencesGeologyMethods in earth sciencesPetrophysics

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Area of Science:

  • Geosciences
  • Hydrogeology
  • Computational Modeling

Background:

  • Fluid flow in fractured geological media is vital for climate change adaptation, resource management, and energy exploration.
  • Current numerical models often use simplified fracture representations, neglecting spatial continuity and directionality in fracture aperture data.
  • This oversight can lead to inaccurate aperture geometry and compromised flow simulation results.

Purpose of the Study:

  • To investigate the impact of integrating spatial continuity information into numerical models of fractured geological media.
  • To assess the benefits of using semi-variogram analysis for deriving spatial continuity in fracture aperture fields.
  • To compare the accuracy of flow simulations using spatial continuity-informed upscaling versus traditional methods.

Main Methods:

  • Semi-variogram analysis was employed to derive spatial continuity information from fracture data.
  • A Freiberg gneiss fracture aperture field was upscaled using two methods: one incorporating spatial continuity and another using traditional arithmetic averaging.
  • Numerical flow simulations were conducted using the upscaled aperture fields, with a focus on performance at coarser mesh resolutions.

Main Results:

  • Upscaling fracture aperture fields with incorporated spatial continuity demonstrated significant improvements in flow simulation accuracy.
  • These improvements were particularly pronounced when using coarser mesh resolutions, indicating enhanced efficiency.
  • The study confirmed that accounting for spatial continuity leads to a more realistic representation of aperture geometry.

Conclusions:

  • Integrating spatial continuity information derived from semi-variogram analysis enhances the accuracy of numerical flow simulations in fractured geological media.
  • This approach offers a superior alternative to traditional methods, especially for large-scale modeling and when computational resources necessitate coarser grids.
  • The findings support the adoption of this enhanced methodology for improved understanding and prediction of fluid flow in complex geological systems.