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effective medium theory

1. n. [Reservoir Characterization]
A method for determining the effective properties of random fields, commonly abbreviated EMT. Originally developed to estimate transport coefficients, this theory is based on the idea of replacing the inhomogeneous medium by an equivalent homogenous medium such that the fluctuations induced by restoring the heterogeneity average to zero. EMT is used to upscale parameters such as permeability for use in coarse-grained reservoir simulation studies. This use is controversial in reservoirs that are not homogeneous. Reference Kilpatrick S: Percolation and conduction, Reviews of Modern Physics 45 (1973): 574-614.

Mansoori J: "A Review of Basic Upscaling Procedures: Advantages and Disadvantages," in Yarus JM and Chambers RL (eds): Stochastic Modeling and Geostatistics, AAPG Computer Applications in Geology , no. 3. AAPG, Tulsa, Oklahoma, USA, 1994.