Interpreting Self-Potential Signal during Reactive Transport: Application to Calcite Dissolution and Precipitation

Geochemistry and reactive transport play a critical role in many fields. In particular, calcite dissolution precipitation are chemical processes occurring ubiquitously the Earth’s subsurface. Therefore, understanding quantifying them necessary for various applications (e.g., water resources, reservoirs, geo-engineering). These fundamental geochemical can be monitored using self-potential (SP) method, which is sensitive to pore space changes, mineralization, mineral–solution interactions. However, there lack of physics-based models linking SP response. Thus, this study, we develop first geochemical–geophysical fully coupled multi-species numerical workflow predict electrochemical This based on simulation computation new expression electro-diffusive coupling multiple ionic species. We apply experiments, performed study focused monitoring alternating with sample electrical conductivity (EC) measurements. carried out experimental part column packed grains, equipped multichannel EC subjected or conditions. From combined investigation analysis, method shows clear responses related concentration gradients, well reproduced simulation, no measurable electrokinetic coupling. novel approach allows us determine location zone. The developed opens perspectives characterize biogeochemical porous media.