Data from a seven week pressure interference test in the Klamath Falls, Oregon geothermal resource have been analyzed. indicate that productive wells are fed by a highly permeable fracture network and that the less permeable matrix blocks contributes ignifi-cantly to the reservoir storage capacity. Detailed analysis of data from two wells is presented. Data from both of the wells yield a reservoir permeability-thickness ( k h ) of approximately 1 .3X106 md-ft and a storativity ($cth) of 6.8X10-3 f t / p s i. The parameters (A and w ), which are determined by the distribu-tion of permeability and storativity between the matrix and fractures, vary by more than an order of magnitude. A sensitivity study shows that for these wells, the pressure transients are not very sensitive to the distribution of permeability and storativity between the fractures and matrix blocks. No hydrologic boundaries were detected during the test. This indicates that the fault which supplies hot water to the shallow hydrothermal system does not behave according to the classical model of either a barrier or constant potential boundary.

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