Flow-coupled-geomechanical modelling of CO2 transport in depleted shale from a microscopic perspective

Qi Gao, Songcai Han, Yuanfang Cheng, Xian Shi, Chuanliang Yan and Zhongying Han

Energy, 2022, vol. 257, issue C

Abstract: Depleted shale reservoirs are the potential candidate sites for long-term geologic storage of CO2. However, understanding of CO2 transport behavior in shale is still a challenge because of the heterogeneity of shale matrix. In this paper, a flow-coupled-geomechanical model is developed for analyzing CO2 transport at the microscale. This model is able to simultaneously capture the geomechanical deformation of organic matter (OM) and inorganic matter (iOM), gas transport in OM and iOM, gas sorption in OM, and both solid and fluid interactions between OM and iOM. The obtained results show that due to shale matrix heterogeneity, i.e., coexistence of OM and iOM, CO2 transport and shale matrix deformation behaviors exhibit regional differences. Specifically, during CO2 injection, pore pressure in OM increases slower, Knudsen number in OM has larger value, apparent permeability in OM is smaller, and volumetric strain in OM is larger. Thus, taking matrix heterogeneity into account is necessary. Moreover, sensitivity analysis indicates that during CO2 injection the apparent permeability of OM changes with both OM and iOM properties while the apparent permeability of iOM only changes with iOM properties. The flow-coupled-geomechanical modelling provides new insights for understanding CO2 transport in depleted shale from a microscopic perspective.

Keywords: Depleted shale; CO2 injection; Matrix heterogeneity; Apparent permeability; Gas sorption (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S0360544222016309
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:257:y:2022:i:c:s0360544222016309

DOI: 10.1016/j.energy.2022.124727

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().