Effect of Celestite Precipitation in Compacted Illite on the Diffusion of HTO, 36 Cl - , and 22 Na +

Diffusion driven barite front nucleation and crystallisation in sedimentary rocks

“…For the negative charge of the anions, their diffusion is restricted in the vicinity of the clay particles charged negatively by the electric double layer of the TOT (tetrahedral-octahedral-tetrahedral) layers. This effect is reported for 36 Cl − by Fukatsu et al (2017) and Chagneau et al (2015b).…”

“…On the other hand, the cations diffusion accelerations of Melkior et al (2009) are not applicable since the experimental rock is not equilibrated with a cation to have homogeneous gel structure in the smectite. At least the results of Fukatsu et al (2017) and Chagneau et al (2015b) regarding the reduced diffusion of anions could be considered if the presence of 10% of clay would be sufficient to influence their diffusion. Thus the position of the barite front in the Vosges is still debated as to the influence of the clay fraction on the ionic diffusion.…”

“…They focused on the transport of chemical species: restriction of anion diffusion in the smallest pore after celestite precipitation (e.g. Chagneau et al (2015b); Fukatsu et al (2017)). According to Loon et al (2016), homogeneous nucleation happens in compacted illite as nanocrystalline celestite crystals are precipitated in the pore space.…”

Capturing the Dynamic Processes of Porosity Clogging

“…Understanding mineral precipitation induced porosity clogging and quantifying its impact on transport and mechanical properties of porous media is important for several energy‐related subsurface systems, including CO 2 sequestration (Brunet et al., 2013; Masoudi et al., 2021; Noiriel et al., 2012; Rathnaweera et al., 2016; Wasch et al., 2013), oil recovery (Schovsbo et al., 2016), geothermal reservoirs (Tranter et al., 2021; Wagner et al., 2005), or deep geological disposal of radioactive waste (De Windt & Spycher, 2019; Fukatsu et al., 2017; Marty et al., 2009; Mon et al., 2017; Samper et al., 2016; Shao et al., 2013; Steefel & Lichtner, 1998; Trinchero et al., 2020; Xie et al., 2022). At the interfaces of multi‐barrier systems, chemical and thermal gradients promote mineral precipitation reactions in porous media, altering pore space morphology (pore size, shapes, and connectivity) and porosity of the system.…”