Escape of Supercritical-CO 2 Fluids Trapped in Calcite Nano-metric Pores

Pierpaolo Zuddas (1) , Stefano Salvi (2) , Olivier Lopez (3) , Giovanni de Giudici (4) , Paolo Censi (5)

1 IG2E - Institut Génie de l'Environnement Ecodéveloppement
2 LMTG - Laboratoire des Mécanismes et Transfert en Géologie
3 LPL - Laboratoire de Physique des Lasers
4 Dipartimento di Scienze Chimiche e Geologiche
5 DiSTeM - Dipartimento di Scienze della Terra e del Mare [Palermo]

Flow of supercritical CO2-bearing fluids through a rock is a fundamental phenomenon which acts upon a great many geological processes ranging from seismic activity to formation of ore deposits. Atomic Force Microscopy scanning experiments allowed us to infer movement of supercritical CO2-bearing fluids through calcite crystals and relate it to natural decrepitation of nanoscale fluid inclusions. Calculated velocities exceed the rate of diffusion predicated via current vacancy models by several orders of magnitude implying that CO2-rich fluid movement through micro and nano-pore space may presently be greatly underestimated.

Domaines: Minéralogie; Sciences de la Terre

Pierpaolo Zuddas, Stefano Salvi, Olivier Lopez, Giovanni de Giudici, Paolo Censi. Escape of Supercritical-CO 2 Fluids Trapped in Calcite Nano-metric Pores. WRI-16, Jul 2019, Tomsk, Russia. 01056; 4 p., ⟨10.1051/e3sconf/20199801056⟩. ⟨hal-02363315⟩