A tracer test will be conducted at the Los Azufres geothermal field to detect possible high permeability flowpaths interconnecting reinjection and production wells, in order to access reinjection feasibility in the Tejamaniles area. This test will be the first of its kind to be conducted in this geothermal field. Tracers will be injected in wells A-7 and A-8; A-2 will constitute the main observation well. This study suggests that other wells, including probably A-16, A-1, A-22 and A-18, should also be monitored. Continuous production/reinjection will provide the driving force for interwell flow. results, simplify logistics, reduce costs, slugs of two different tracers, each identifying a particular well, will be simultaneously injected. We chose anions as tracers because they propagate through reservoir formations with negligible absorption, and considering the availability of equipment for their analysis. Several bromide, iodide and thiocyanate salts were considered as prospective tracer sources. The unknown background iodide concentrations in the reservoir were detemined by us. We estimated the munts of the prospective salts to be injected by means of Lenda and Zuber's method, and computed the corresponding costs. Considering these amount-cost calculations and that bromide and iodide have been extensively tested in geothemal enviroments, we chose these anions as the main tracers for the test. As a complement, we propose to conduct a field experiment to evaluate thiocynate as a geothemal tracer.

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