Distinct element modelling of naturally fractured reservoirs is used to investigate changes of hydraulic conductivity induced by fluid injection. General conclusions are drawn relating to the effects of uniform changes of pore pressure on conductivity anisotropy in connected joint systems. The influence of cross-cutting discontinuous joints on the conductivity of the joints against which they terminate is emphasized. Results from a two dimensional model are related to the observed performance of a granitic geothermal reservoir. On emploie le modèle à éléments distincts des réservoirs fracturés de façon naturelle pour étudier les changements dans la conductivité induits par l'injection de fluide. Des conclusions générales sont tirées concernant les effets de changements uniformes de pression interstitielle dans des systèmes de joints reliés sur l'anisotropie de conductivité. On accentue l'influence exercée sur la conductivité des joints par des joints discontinus transversaux. Des résultats obtenus à partir d'un modèle bidimensionnel sont comparés avec lea performances observées d'un réservoir géotbermique granitique.
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