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Transport in Porous Media

, Volume 67, Issue 3, pp 395–412 | Cite as

Permeability up-scaling using Haar Wavelets

  • Vera PancaldiEmail author
  • Kim Christensen
  • Peter R. King
Original Paper

Abstract

In the context of flow in porous media, up-scaling is the coarsening of a geological model and it is at the core of water resources research and reservoir simulation. An ideal up-scaling procedure preserves heterogeneities at different length-scales but reduces the computational costs required by dynamic simulations. A number of up-scaling procedures have been proposed. We present a block renormalization algorithm using Haar wavelets which provide a representation of data based on averages and fluctuations.

In this work, absolute permeability will be discussed for single-phase incompressible creeping flow in the Darcy regime, leading to a finite difference diffusion type equation for pressure. By transforming the terms in the flow equation, given by Darcy’s law, and assuming that the change in scale does not imply a change in governing physical principles, a new equation is obtained, identical in form to the original. Haar wavelets allow us to relate the pressures to their averages and apply the transformation to the entire equation, exploiting their orthonormal property, thus providing values for the coarse permeabilities.

Focusing on the mean-field approximation leads to an up-scaling where the solution to the coarse scale problem well approximates the averaged fine scale pressure profile.

Keywords

Up-scaling Real-space Renormalization Haar Wavelets 

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Copyright information

© Springer Science+Business Media B.V. 2006

Authors and Affiliations

  • Vera Pancaldi
    • 1
    • 2
    Email author
  • Kim Christensen
    • 2
  • Peter R. King
    • 1
  1. 1.Department of Earth Science and EngineeringSouth Kensington Campus, Imperial CollegeLondonUK
  2. 2.Department of PhysicsSouth Kensington Campus, Imperial CollegeLondonUK

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