Investigation of fracture network permeability using Effective Medium Theory (EMT) approach looks an efficient alternative method for the numerical modeling. However the degree of uncertainties for fluid flow analysis using EMT method compared with numerical modeling has not yet been reported. A numerical code based on the EMT approach for calculating the equivalent permeability of fracture network was developed. A series of stochastic DFN models were generated with a large number of realizations with different model sizes. The Representative Elementary Volumes (REV) of permeability for both numerical and EMT models are investigated. The calculated values of permeability with EMT are overestimated compared with the numerical modeling results. The mean value of equivalent permeability of EMT method is two orders larger than numerical modeling results. With increasing the model side length, network permeability is increased in EMT method and REV is estimated in rather small DFN model size.

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