Interpretation of the Tracer Test of Balçova Geothermal Field

Abstract

A successful two well tracer test was conducted in Balcova - Narlidere Geothermal field (Turkey) where Rhodamine B and NaCl salt were injected from two separate injection wells. Observation of Rhodamine B and increase in the NaCl concentration in all production wells indicated that the production and injection wells are connected along the Agamemnon fault. Analysis of mean arrival time arrow plots showed the presence of several orthogonal fracture systems. Mathematical modeling results showed that NaCl tracer profiles were modeled by double porosity models. On the other hand, Rhodamine B tracer return curves were matched with fracture-matrix and multifracture models. It was found that as the production well depth becomes deeper the number of interstitial velocity inflection points increases showing that the well produces from more than one fracture systems.