Geothermal Fluid Geochemistry and Thermometry
Summary
Geothermal fluid geochemistry examines the chemical and isotopic composition of naturally heated waters and gases to characterise subsurface processes, reservoir properties and fluid circulation pathways. Key controls on fluid composition include water–rock interaction, gas–fluid equilibrium, mixing with shallow or surface waters, and phase separation through boiling or condensation. Chemical geothermometers exploit temperature‐dependent equilibria between dissolved solutes and minerals or gas‐water partitioning to infer reservoir temperatures, while isotopic tracers (for example hydrogen, oxygen, carbon and noble gases) reveal fluid provenance, residence times and depth of circulation. Together, these approaches inform conceptual models of geothermal systems, guiding exploration and sustainable resource development. Geochemical signatures also aid assessment of scaling and corrosion risks in production wells, and support environmental monitoring of induced seismicity and subsurface injection activities. Advances in analytical precision and multicomponent modelling now allow more reliable temperature estimates and more detailed reconstructions of fluid evolution, enhancing the viability of geothermal energy worldwide.
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Geothermal Fluid Geochemistry and Thermometry publication trend
The graph below shows the total number of articles in geothermal fluid geochemistry and thermometry across all publications each year (not limited to Nature Index journals).
Technical terms
Geochemical thermometry: Techniques that estimate subsurface temperatures by analysing chemical equilibria between dissolved constituents and minerals or gases.
Isotopic fractionation: The preferential partitioning of isotopes between phases or species, often temperature‐dependent, used to trace fluid sources and thermal histories.
Convection‐conduction circulation: A heat transport regime in which fluid movement (convection) and thermal diffusion (conduction) jointly govern reservoir temperature distribution and flow pathways.
Hot dry rock (HDR): A geothermal resource hosted in low‐permeability crystalline rocks, heated primarily by radiogenic decay, targeted through enhanced permeability for energy extraction.
Chalcedony geothermometer: A temperature indicator based on the solubility of microcrystalline silica, used to reconstruct reservoir temperatures from dissolved silica concentrations.
References
- The influence of oxygen isotope exchange between CO2 and H2O in natural CO2-rich spring waters: Implications for geothermometry. Applied Geochemistry (2017).
- Heat Generation and Accumulation for Hot Dry Rock Resources in the Igneous Rock Distribution Areas of Southeastern China. Lithosphere (2022).
- Hydrogeochemical and Isotopic Analyses of Deep Geothermal Fluids in the Wumishan Formation in Xiong’an New Area, China. Lithosphere (2022).
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