Experimental study of carbonated water imbibition in deep coal rocks using nuclear magnetic resonance spectroscopy
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Abstract
The deep eastern edge of the Ordos Basin is rich in coalbed methane, presenting great potential for development. Meanwhile, CO₂ imbibition is an important method to increase production. To study the CO₂-water-rock interactions and microstructural damage characteristics before and after supercritical carbon dioxide immersion in deep coal rocks, CO₂ imbibition experiments were conducted on these rocks by using nuclear magnetic resonance and scanning electron microscopy imaging techniques. The results showed that CO₂ imbibition leads to pore dilatation and reveals the key role of coal rock anisotropy on imbibition efficiency under different physicochemical conditions. Specifically, the immersion of CO₂ produces cracks due to the brittle action of the coal rock, as well as calcite dissolution that exacerbates crack production and expansion. Due to adsorption of CO₂, part of the coal rock becomes swollen, which leads to detachment and changed the physical properties and surface characteristics of the coal rock.
Document Type: Original article
Cited as: Yang, L., Liu, Z., Zhao, Z., Li, W., Ding, J., Sun, L. Experimental study of carbonated water imbibition in deep coal rocks using nuclear magnetic resonance spectroscopy. Capillarity, 2025, 16(2): 27-38. https://doi.org/10.46690/capi.2025.08.01
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