Speaker
Description
Saline water evaporation from porous media may result in salt precipitation within the pore system influencing transport properties of porous media (Dashtian et al., 2018). Porosity is one of the key characteristics which could be modified due to salt precipitation. Understanding the nature and extent of porosity reduction as a result of salt crystallization is crucial in understanding transport processes in porous media.
This work studies salt precipitation within four rock samples with significantly different pore systems and compositions. We present the precipitated salt distribution along these samples directly measured using 3D X-ray micro-tomography (micro-CT) imaging technique. The selected samples are Boise sandstone, Silurian Dolomite, Mount Gambier limestone, and Berea sandstone. All samples were initially saturated with Potassium Iodide solution (5 molar concentration) and left to evaporate over the course of 31.5 hours. The evaporation process and salt precipitation are monitored using 3D images obtained with X-ray micro-CT at timestamps of 3 and 31.5 hours after the initial saturation. Images were then segmented to determine the porosity of each sample along the core length. Although a time resolved X-ray micro-CT study (such as Pak et al 2019) may be needed to better understand dynamics of the process, the recorded pore-scale images enabled us to quantify the variation of porosity in natural porous media as a result of drying-induced salt precipitation with a high spatial resolution. Our results reveal the significant impacts of heterogeneity on the spatial distribution of precipitated salt. Additionally, we will discuss the potential consequences of our findings on water evaporation from heterogeneous porous media (Shokri-Kuehni et al. 2017).
References
Dashtian, H., Shokri, N., Sahimi, M. (2018). Pore-network model of evaporation-induced salt precipitation in porous media: the effect of correlations and heterogeneity. Adv. Water Resour., 112, 59-71. https://doi.org/10.1016/j.advwatres.2017.12.004
Shokri-Kuehni, S.M.S., Norouzirad, M., Webb, C., Shokri, N. (2017). Impact of type of salt and ambient conditions on saline water evaporation from porous media. Adv. Water Resour., 105, 154-161. https://doi.org/10.1016/j.advwatres.2017.05.004
Pak, T., Archilha, N., Mantovani, I. et al. An X-ray computed micro-tomography dataset for oil removal from carbonate porous media. Sci Data 6, 190004 (2019). https://doi.org/10.1038/sdata.2019.4
| Participation | Online |
|---|---|
| Country | United Kingdom |
| MDPI Energies Student Poster Award | Yes, I would like to submit this presentation into the student poster award. |
| Time Block Preference | Time Block B (14:00-17:00 CET) |
| Acceptance of the Terms & Conditions | Click here to agree |
