Decoding the depths: A new geothermometry framework for China’s mixed-fluid carbonate systems

Chinese scientists have developed an integrated geothermometry approach to tackle a persistent challenge in geothermal exploration: accurately estimating subsurface temperatures in carbonate reservoirs where multiple fluids mix. Published in Geothermics, the research led by Rudan Zheng and colleagues from several Chinese institutions focuses on the Yichuan Basin in central China, a region where complex hydrochemical and structural conditions have historically complicated thermal assessments.

Traditional geothermometers, which rely on the chemical composition of geothermal fluids, often fail in mixed-fluid systems because they cannot distinguish between waters from different depths or origins. The team’s novel methodology combines standard chemical geothermometry with structural geological constraints and hydrochemical data, creating a more robust framework. By incorporating fault systems and fracture networks into the temperature calculation model, the researchers achieved a significant improvement in predictive accuracy over conventional methods.

For China, which holds vast untapped geothermal potential, this advancement is strategically important. The Yichuan Basin is representative of many sedimentary basins across the country where carbonate-hosted geothermal systems are found. A more reliable method for assessing reservoir temperatures directly impacts the feasibility and efficiency of geothermal power generation and direct-use heating projects. This work provides a practical, field-tested tool that can be applied to de-risk exploration in similar geological settings throughout China and globally.

Why it matters:
This research provides a critical methodological upgrade for geothermal resource assessment in complex geological settings. For energy investors and project developers operating in China’s sedimentary basins, it offers a pathway to more accurate resource estimation, ultimately reducing exploration uncertainty and supporting the country’s push for cleaner, baseload renewable energy.

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