Effects of pore water-rock reaction on heat extraction from the karst geothermal reservoirs

Based on the dual media model

Journal Article (2024)
Author(s)

Jiayan Ji (China University of Petroleum - Beijing)

Xianzhi Song (China University of Petroleum - Beijing)

Junlin Yi (China University of Petroleum - Beijing)

G. Song (TU Delft - Applied Geology)

Gaosheng Wang (China University of Petroleum - Beijing)

Research Group
Applied Geology
Copyright
© 2024 Jiayan Ji, Xianzhi Song, Junlin Yi, G. Song, Gaosheng Wang
DOI related publication
https://doi.org/10.1016/j.energy.2024.130651
More Info
expand_more
Publication Year
2024
Language
English
Copyright
© 2024 Jiayan Ji, Xianzhi Song, Junlin Yi, G. Song, Gaosheng Wang
Research Group
Applied Geology
Bibliographical Note
Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. @en
Volume number
293
Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Abstract

Fractures and caves are the main flow and storage channels for the karst geothermal reservoirs, and the water-rock reaction within them significantly affects the thermal performance. Most previous studies concentrated on the fractures, disregarding the impact of the pore water-rock reaction. The objective of this study is to explore the importance of pore water-rock reactions and identify the influence of various parameters when considering pore and fracture water-rock reactions. A 3D thermal-hydraulic-chemical coupling model considering dual media of pores and fractures was developed. The importance of pore water-rock reactions is demonstrated, and quantitatively characterize the effect of injection temperature (Tin), injection rate (Qin), injection concentration (cin), and ratio of the reaction-specific surface area between pore and fracture (Ap/Af) on the thermal performance. Results indicate that the pore water-rock reaction drastically affects the hydraulic conductivity and pressure difference, even leading to an opposite trend. The influence of water-rock reaction in pores on fracture deformation is regulated by Ap/Af, which augments with Ap/Af. The relative contribution of Ap/Af to production temperature, net thermal power, pressure difference, and hydraulic conductivity are 12.8%, 4.1%, 6.8%, and 13.7%, respectively. This study provides a significant guide for accurate production prediction and exploitation of karst-based geothermal reservoirs.

Files

1-s2.0-S0360544224004237-main.... (pdf)
(pdf | 7.25 Mb)
- Embargo expired in 08-08-2024
License info not available