Naturally fractured reservoirs have received considerable attention in the recent decades since more than half of the world oil reserves are found in this type of deposits; then, it is becoming fundamental a good characterization of these reservoirs and their understanding for having a better success in their exploitation and management. Generally, as originally proposed by Warren and Root, naturally-fractured formations are represented by a two scale model: a fracture network and a matrix.

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... modeling assumes that the fracture network is equivalent to a homogeneous medium fixed into a Euclidean geometry. However, it has been shown that the fracture networks are fractal elements which must be seen as alternative views for reservoirs with multiple scales and a network of non-Euclidean fractures. Fractal geometry is a good candidate for representing such systems. Several models and solutions based on the transient-pressure behavior have been presented in the literature with which were found that the change in pressure is a function of a power-law relationship where the exponent is related to the fractal dimension. In this work, direct expressions were developed from observing characteristic features on the pressure derivative log-log plot, so fracture permeability, fractal dimension conductivity index, flow capacity and storativity ratio can be estimated. The equations were successfully tested with synthetic examples.