PilotSTRATEGY was present at the Caprock Integrity and Gas Storage Symposium (CIGSS) that took place in Saint-Ursanne, Switzerland on 27-18 January 2026. On Day 1, French partner Frédéric Mathurin (BRGM) delivered the presentation Quantification of potential mineralogical alteration of the transitional Callovian caprock in a context of geological CO2 storage (Paris Basin, France).
The conference provided an opportunity to introduce the PilotSTRATEGY project to present the French study site, and to explain the site‑specific approach applied within the project. The presentation also highlighted the high‑pressure and high‑temperature laboratory experiments (180 bar and 70°C) carried out on caprock samples (French site) to evaluate rock reactivity under different CO₂ pressure conditions, simulating the various physical states of CO₂ expected during long‑term geological storage. The understanding of the geochemical processes was further refined through numerical simulations (geochemical modelling) due to the complex mineralogy (up to 13 mineral phases). The integrated workflow, combining both experimental investigations and numerical simulations, was particularly well received and clearly stood out.
The presentation sparked productive discussions, particularly regarding the project’s careful consideration of all mineralogical specificities — an aspect that is often overlooked when generic conceptual geochemical models, largely derived from published regional‑scale data, are used (and result in higher uncertainty).