Stanford Geothermal WorkshopFebruary 9-11, 2026

Despite significant technical challenges (Kibikas et al., 2026), drilling into supercritical fluids offers access to exceptionally high-energy resources, with the potential to deliver up to ten times more power than conventional geothermal wells. In addition to engineering hurdles, the origin and chemical composition of these fluids remain active areas of research. Sub- and supercritical fluids may originate from magmatic degassing or be trapped during the late stages of crystallization of magmatic intrusions. Recent high-temperature flow-through experiments have provided new insights, revealing the chemical and mineralogical transformations associated with supercritical fluid formation during conductive heating and boiling of subcritical geothermal groundwater by magmatic intrusions. These studies suggest that resulting supercritical fluids are typically depleted in major rock-forming elements such as Si, Na, K, Ca, Mg, and Al, but enriched in volatile elements including C, S, and B. As part of the Supercritical Drilling Material Analysis (Kibikas et al., 2026), we have compiled detailed fluid chemistry data from both subcritical and supercritical geothermal wells. With the release of this publicly accessible dataset on the Geothermal Data Repository (GDR, https://gdr.openei.org), we aim to advance our understanding of the characteristics and behavior of fluids across the sub- to supercritical transition. In this study, we examine differences in fluid chemistry across subcritical to supercritical geothermal fields to establish a foundation for further investigations of drilling and completion materials. This integrated approach helps refine conceptual models of supercritical geothermal systems and supports the development of more efficient, targeted drilling strategies, as well as informed selection of well construction materials for future exploration.

Topic: Emerging Technology