Séminaire ISTerre

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Clay, water, and salt: Controls on the hydrology and mechanics of fine-grained soils, sediments, and sedimentary rocks

jeudi 22 juin 2023 - 11h00

Ian C. Bourg (introduction Bastien Wild 10:45) - Princeton University
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A recurrent theme in the use of the subsurface for water, energy, or carbon mitigation is the importance of ne-grained (clay-rich) soils and sedimentary rocks. Fine-grained rocks (shale, mudstone) are used as caprocks, host rocks, and source rocks in a range of low-carbon energy technologies including carbon capture and storage, high-level radioactive waste storage, and shale hydrocarbon extraction. Fine-grained soils play an equally outsized role in agriculture and soil carbon storage. This importance of clay-rich media derives largely from their distinct hydrologic and mechanical properties (ultra-low permeability, swelling-shrinking and cracking). Here, we re-examine existing data on the hydrologic and mechanical properties of ned grained soils and sedimentary rocks. We show that these properties are controlled by chemo-mechanical-chemical couplings at two key scales: a nanoscale dened by the aggregation and swelling of clay (nano)particles and a mesoscale dened by the assemblage of larger grains. We present recent advances in modeling the distinct properties of clay-rich media on these two length scales using molecular dynamics (MD) and computational uid dynamics (CFD) simulations.

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Equipe organisatrice : Grands Séminaires ISTerre

Amphithéâtre Killian, Maison des Géosciences, 38400 Saint Martin d'Hères

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