Identification of production zones in a fractured or faulted qeothermal well is quantitatively difficult. Temperature and spinner surveys along with flow tens are the techniques generally used to identify and describe these fractured zones during production testing.These techniques generally do not describe the production zones in any detail and they miss or bypass potential zones of production when fractures have been closed or plugged during the drilling process.These latter zones could possibly be stimulated(hydraulic fracturing,acidizing,explosive fracturing ) and brought into production if all the fracture zones could be identified and described. Interpretation techniques using wire line logs show pronisc in identifying and describing fractured (open and closed) zones in geothermal wells. The strategy described in this paper on two different geothermal well s ( the hot dry rock well and the Surprise Valley well ) used atrial and error basis to outline and define the interpretation techniques that Nork best in each case. Fracture zones are identified that are both open and closed and this type of in formation gives a better estimation of reservoir size, flow control and reservoir life (production potential ) from geothermal wells.

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