Experimental Geochemistry for Geothermal Solutions: Advancing Industry Practice at ESNZ

Abstract

The Experimental Geochemistry Laboratory (EGL) at Earth Science New Zealand (ESNZ) has expanded its capabilities to include the supercritical pressure-temperature region. With experimental work spanning water-rock interactions, mineral solubilities, scaling/corrosion simulations, and CO2 reinjection, the laboratory contributes to advancing geochemical understanding and industry practices in the geothermal setting. With expanded capabilities the lab can conduct such studies at the more extreme temperature and pressure conditions of the supercritical environment. New innovative experimental methods at supercritical conditions include seawater - basalt interaction, water/brine - greywacke interaction, CO2 – brine co-injection, and mineral thermochemistry measurement. The experimental approach aids in understanding geochemical processes at sub/supercritical conditions in geothermal reservoirs and in current and future power station infrastructure.