At the time of sulmitting this paper we are running the first tracer test in the Los Azufres field. The main goals of test are: to probe the concept of using separated spent brines as extranely inexpensive sources of tracers; to detect possible high conductivity hydraulic flowpaths between prospective reinjection wells and the nearby production zone in the Tejamaniles area; to monitor reservoir temperatures during tie test in order to abtain valuable extra obsenmticnal constrain- to aid the interpretation; and to field test a number of techniques concerning data gathering and analysis. So far, we have found no evidence of the existence of hydraulic communication between the reinjection and the production zone. Nevertheless, we were able to conclude that the a- and Na+ dissolved in concentrated spent geothermal bines can be used as reliable and extrarrely inexpnsive tracers for hidrothepllal flows, pimvided that the injectim of the brine is steplike (amtinuns injection at constant flowrate and concentration). we also found in necessary to &tor reserwir temperatures during the test, by mans of both, the m/K and the silica gecthemmeters, in onkr to allow dhgmsis of boiling in the reservoir, which can cause the arrival of a chemical front.

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