Evaluation of CO 2 Storage in a Shale Gas Reservoir Compared to a Deep Saline Aquifer in the Ordos Basin of China

Danqing Liu, Yilian Li and Ramesh Agarwal
Additional contact information
Danqing Liu: School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
Yilian Li: School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
Ramesh Agarwal: Computational Fluid Dynamics Laboratory, Washington University in St. Louis, 1 Brookings Dr., St. Louis, MO 63130, USA

Energies, 2020, vol. 13, issue 13, 1-18

Abstract: As a new “sink” of CO 2 permanent storage, the depleted shale reservoir is very promising compared to the deep saline aquifer. To provide a greater understanding of the benefits of CO 2 storage in a shale reservoir, a comparative study is conducted by establishing the full-mechanism model, including the hydrodynamic trapping, adsorption trapping, residual trapping, solubility trapping as well as the mineral trapping corresponding to the typical shale and deep saline aquifer parameters from the Ordos basin in China. The results show that CO 2 storage in the depleted shale reservoir has merits in storage safety by trapping more CO 2 in stable immobile phase due to adsorption and having gentler and ephemeral pressure perturbation responding to CO 2 injection. The effect of various CO 2 injection schemes, namely the high-speed continuous injection, low-speed continuous injection, huff-n-puff injection and water alternative injection, on the phase transformation of CO 2 in a shale reservoir and CO 2 -injection-induced perturbations in formation pressure are also examined. With the aim of increasing the fraction of immobile CO 2 while maintaining a safe pressure-perturbation, it is shown that an intermittent injection procedure with multiple slugs of hug-n-puff injection can be employed and within the allowable range of pressure increase, and the CO 2 injection rate can be maximized to increase the CO 2 storage capacity and security in shale reservoir.

Keywords: CO 2 geological storage; shale; phase transformation; pressure perturbation; injection schemes (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (5)

Downloads: (external link)
https://www.mdpi.com/1996-1073/13/13/3397/pdf (application/pdf)
https://www.mdpi.com/1996-1073/13/13/3397/ (text/html)

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:gam:jeners:v:13:y:2020:i:13:p:3397-:d:379356

Access Statistics for this article

Energies is currently edited by Ms. Agatha Cao

More articles in Energies from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().