Well tests are commonly recognized as a valuable source of information for the large scale characterization of the dynamic behaviour of a reservoir. However, when the level of heterogeneity is high, the interpretation becomes complex as the data convolute multi-scale responses. A key to resolving the complexity may be to isolate the wells evidencing a specific flow mechanism.<br>This paper focuses on a karst reservoir where both emersion & hydrothermal circulation occurred. The static model has been discussed in a previous paper (1) and more specifically the way fractures control karst development. In the present work, we focus on the dynamic data and show how the main features of the karst can be characterized by the use of well test and pressure build up data.<br>


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