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An approach consisting of a combination of composite and naturally fractured reservoir models has been proposed to interpret pressure-transient data from an 11-well interface test in a highly heterogenous geothermal reservoir. The approach leads to an integrated interpretation that accounts for all of the salient features of the data. An initial appraisal of the data indicates excellent agreement with theoretical results for double-porosity reservoirs. For some of the wells, however, the bulk storativity, calculated with the double-porosity model, differs significantly from the average value of this parameter. Furthermore, it increases systematically as the distance between the active and observation well decreases. To explain this particular result, an alternative method of analyzing data from composite reservoirs is presented. The method demonstrates that local permeability variations can result in enormous variations in the apparent storativity without causing variations in the apparent permeability-thickness of the reservoir. A simple graphical technique, based on analyzing systematic variations in the apparent storativity, has been developed to determine the size of the region and the mobility contrast between different regions of the reservoir. By using this technique, the authors show that the observed variations in the storativity are the result of a small, high-permeability region that surroundsmore » the pumped well and is penetrated by several of the observation wells.« less

Analysis of Interference Data in a Highly Heterogeneous Naturally Fractured Geothermal Reservoir