Fig. 3

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Illustration of (a) a regular fracture network where different sub-volumes (sub-blocks) are present (Sv1a, Sv2a, Sv3a, and Sv4a), (b) the MINC6–PF model, (c) an irregular fracture network distribution occurring in a matrix grid cell where different sub-volumes (sub-blocks) are present (Sv1b, Sv2b, Sv3b, and Sv4b) and (d) its corresponding MINC6–PF model.