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Int ro duc tion Because of the drastic increase in o i Ugas discovertes where natotal fractures pl ay an important tule in production (North sea, Middle east ; USA, North Africa. . .), focus on fracture studies with an ultimate goal of fracturing on subsurface Huid flow and subsequent reservoir performance is of paramount importance in the reservoir evaluation and management. This interest manifested itself by including different topics such as fracture origin, morphology ; spacing, permcability, timing. .. at different sca l es (well bore, seismic, surface) using different techniques .

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