Experimental study of carbonated water imbibition in deep coal rocks using nuclear magnetic resonance spectroscopy
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
Keywords:
Coal rock, imbibition, carbonated water imbibition, nuclear magnetic resonance, pore structureReferences
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