Multiphase reactive flow during CO₂ storage in sandstone
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
Geological CO2 storage is a promising strategy for reducing greenhouse gas emissions; however, its underlying multiphase reactive flow mechanisms remain poorly understood. We conducted steady-state imbibition relative permeability experiments on sandstone from a proposed storage site, complemented by in situ X-ray imaging and ex situ analyses using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). Despite our use of a brine that was pre-equilibrated with CO2, there was a significant reduction in both CO2 relative permeability and absolute permeability during multiphase flow due to chemical reactions. This reduction was driven by decreased pore and throat sizes, diminished connectivity, and increased irregularity of pore and throat shapes, as revealed by in situ pore-scale imaging. Mineral dissolution, primarily of feldspar, albite, and calcite, along with precipitation resulting from feldspar-to-kaolinite transformation and fines migration, were identified as contributing factors through SEM–EDS analysis. This work provides a benchmark for storage in mineralogically complex sandstones, for which the impact of chemical reactions on multiphase flow properties has been measured.
Date Issued
2025-05-01
Date Acceptance
2025-01-21
Citation
Engineering, 2025, 48, pp.81-91
ISSN
2095-8099
Publisher
ELSEVIER
Start Page
81
End Page
91
Journal / Book Title
Engineering
Volume
48
Copyright Statement
© 2025 THE AUTHORS. Published by Elsevier LTD on behalf of Chinese Academy of Engineering and Higher Education Press Limited Company. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
License URL
Subjects
ALKALI-FELDSPAR DISSOLUTION
DEGREES-C
Engineering
Engineering, Multidisciplinary
Geochemical reactions
Geological CO2 storage
INJECTION
Multiphase reactive flow
Relative permeability
RELATIVE PERMEABILITY
RESERVOIR
ROCK INTERACTIONS
Science & Technology
SECONDARY MINERAL PRECIPITATION
SIMON SANDSTONE
SUPERCRITICAL CO2
Technology
VISCOSITY
Publication Status
Published
Date Publish Online
2025-02-24