This paper proposes to improve the natural fracture network characterisation by analysis microseismic data. We use a 3D Hough transform to build fracture orientation and density maps describing discontinuities that cannot be described by other measurements. The stochastic Discrete fracture simulator combines geostatistical and pseudo-genetic approaches to generate models that honour both measures from field characterisation and hierarchical organisation that result from the fracturing process itself. We suggest that using realistic fracture network characterisation and introducing mechanical concepts in the DFN simulation process affect connectivity of DFNs, hence is essential for predictivity of reservoir flow models.