The optimal development and management of a geothermal resource requires a knowledge of the hydrological characteristics of the reservoir. Reservoir engi neeri ng analysis techniques for permeable aquifers have been undergoing development for several decades but little attention has been paid to fracturedominated systems. The Department of Energy funded a joint EGtG Idaho, Inc./Univ. of Utah Research Institute program to test the ability of "Huff-Puff" tests to help characterize a fracture-dominated reservoir. Several series of these injection (*Huff")-backflow ("Puff") tests were conducted at the Raft River KGRA in Southern Idaho. These test series are described and preliminary results and interpretations are discussed.

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