Stress-Strain-Sorption Behaviour of Smectites Upon Exposure to Dry and Wet CO2
نویسندگان
چکیده
The swelling-shrinkage behavior of smectites induced by interlayer uptake or sorption CO 2 and H O has been investigated with increasing interest recent years, primarily because its potential impact on the sealing efficiency clay-bearing caprocks overlying storage reservoirs. To get a better understanding stress-strain-sorption coupling in smectite exposed to supercritical , we performed multiple stepwise axial loading unloading, oedometer-type experiments ?1 mm thick discs pre-pressed Na-SWy-1 Ca-SAz-1 montmorillonite. Initially air-dry (AD) samples were first tested presence wet (20% RH) at 10 MPa pressure, vacuum-dry (VD) state pure (dry) MPa. incrementally loaded unloaded 40°C, employing effective stresses ranging from 0.5 44 Control tests using dry He Ar instead distinguish strains due loading-related sorption/desorption purely poroelastic effects. All saturated exhibited 30–65% lower apparent stiffness moduli than when Ar, showing that adsorption/desorption altered mechanical response smectites. Relative tests, swelling few % (corrected for effects) measured AD decreasing 4.9 3.8% range 1.6–36.2 SAz-1 material similar tends. VD showed much smaller relative (0.5–1.5%), which also decreased applied stresses. experimental data strain versus stress are well fitted thermodynamic model coal. Results derived fits indicate smectite-rich rocks have significant capacity shallow depths (up 1.5–2 km) through clay minerals. However, this component is reduced more 80% burial depth beyond 3 km. provides step towards modelling effects rich penetrated though further refinements needed broader application smectite-CO -H system.
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ژورنال
عنوان ژورنال: Frontiers in Earth Science
سال: 2022
ISSN: ['2296-6463']
DOI: https://doi.org/10.3389/feart.2022.911247