6533b863fe1ef96bd12c7925

RESEARCH PRODUCT

Escape of Supercritical-CO2 Fluids Trapped in Calcite Nano-metric Pores

Stefano SalviGiovanni De GiudiciPierpaolo ZuddasOlivier LopezPaolo Censi

subject

Calcitelcsh:GE1-350Materials science010504 meteorology & atmospheric sciences[SDU.STU]Sciences of the Universe [physics]/Earth SciencesOrders of magnitude (numbers)010502 geochemistry & geophysics01 natural sciencesSupercritical fluidDecrepitationchemistry.chemical_compoundchemistryChemical physicsVacancy defectNano-Fluid inclusionsCO2Current (fluid)lcsh:Environmental sciences0105 earth and related environmental sciences[SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy

description

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.

10.1051/e3sconf/20199801056https://www.e3s-conferences.org/articles/e3sconf/pdf/2019/24/e3sconf_wri-162018_01056.pdf