The Coso geothermal system is the location of a major EGS project. This system is ideal for the study of fluid-mineral equilibria along the injection-production flow path because it has a large geochemical database spanning 15 years of production, nearly 100 production wells, 23 injection wells, and a broad range of temperatures and salinities. Injection waters range from acidified hot brine to cool condensate.

Like all geothermal systems, the temperatures and compositions of the injection waters naturally perturb the initial-state fluid-mineral equilibria by introducing water with temperatures and compositions that are distinctly different than that in the reservoir. In this paper we present some examples of shifts in the Coso reservoir fluid composition that have been brought about by injection, and discuss the implications for these changes with respect to modeling the injection-production flow path.

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