Integrity analysis of CO2 storage sites concerning geochemical-geomechanical interactions in saline aquifers
MetadataShow full item record
A systematic and careful analysis of changes in the magnitude of geomechanical parameters is essential to mitigate the risk of leakage from CO2 storage sites. However, depending on rocks and storage sites, these changes might be different due to chemical reactions taking place, especially when it comes to saline aquifers. There have only been few studies carried out in the past to evaluate the maximum sustained pressure of rocks being exposed to these chemical interactions. However, more studies are still required to evaluate the strength of the storage medium or seals when different kinds of rocks and fluids (fresh water or brine) are included in the hostile environment of a storage site. In this paper, attempts were made to evaluate changes in the variation of geomechanical parameters of the Berea sandstone during and after the injection of supercritical CO2 in a short period of time. The results obtained indicated that the presence of brine in the pore space during injection enhances the severity of geochemical reactions, causing reductions in the magnitudes of elastic parameters including shear modulus. Having a good look into the SEM images of the sample before and after exposure to scCO2 indicated that these changes can be attributed to the dissolution/fracturing of calcite and clays in the matrix of the sample. Although findings were provided based on the pulse measurements tests, more studies are required to have a deeper understanding as to how geochemical reactions may cause difficulties during and after injection into a storage site.
Showing items related by title, author, creator and subject.
Lüth, S.; Ivanova, A.; Juhlin, Christopher; Juhojuntti, N.; Kashubin, A.; Bergmann, P.; Götz, J. (2011)As a response to global warming, mainly caused by increasing atmospheric concentration of carbon dioxide, and growing energy consumption world-wide, Carbon Capture and Storage (CCS) is regarded as one option to ensure ...
Zhang, Y.; Lebedev, Maxim; Sarmadivaleh, Mohammad; Yu, H.; Iglauer, Stefan (2018)Copyright 2018, Unconventional Resources Technology Conference (URTeC). Carbon geosequestration in deep saline aquifers is an efficient way to mitigate climate change due to greenhouse gas emissions. The carbonate reservoir ...
Review of the deterministic modelling of deformation zones and fracture domains at the site proposed for a spent nuclear fuel repository, Sweden, and consequences of structural anisotropyStephens, M.; Follin, S.; Petersson, J.; Isaksson, H.; Juhlin, Christopher; Simeonov, A. (2015)© 2015 Elsevier B.V. This paper presents a review of the data sets and methodologies used to construct deterministic models for the spatial distribution of deformation zones and intervening fracture domains in 3-D space ...