The Effect of Supercritical CO2 on Shaly Caprocks

Hadian, Pooya; Rezaee, Reza

doi:10.3390/en13010149

Cited by 20 publications

(13 citation statements)

References 49 publications

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“…Generally, the fluid–rock interactions promote element mobility, which may result in various levels of mineral dissolution–precipitation . For instance, kaolinite precipitation in basalt rocks was reported due to the dissolution of anorthite during CO 2 injection . The impact of minerals mobility with hydrogen injection in basalts might occur as well, despite the low acidity of hydrogen redox reactions as mentioned earlier .…”

Section: Discussionmentioning

confidence: 96%

“…The XRD results show high compositions of plagioclase minerals, which, in the presence of other fluids such as CO 2 , CH 4 , and H 2 , may cause mineral dissolution and precipitation within the rock matrix. Based on the previous observations of feldspar-based minerals’ interactions with CO 2 , , the reaction can promote the generation of divalent cations (Ca 2+ ) and monovalent cations (Na + or K + ), which in both cases can lead to precipitation of carbonate and clay minerals such as kaolinite, calcite, and dolomite . However, compared to CO 2 injection, which is dominated by acid–base reactions, it is expected that the injection of hydrogen will have a minor level of mineral dissolution/precipitation on basalt due to the associated reduction–oxidation (redox) reactions .…”

Section: Discussionmentioning

confidence: 99%

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Basalt–Hydrogen–Water Interactions at Geo-Storage Conditions

Al-Yaseri,

Fatah,

Amao

et al. 2023

Energy Fuels

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Hydrogen geo-storage is a promising technology to achieve net-zero carbon emissions. Basaltic rocks have attracted limited attention, and only limited knowledge of the suitability of the basaltic formations for large-scale hydrogen storage is available. The complex in situ geochemical reaction of basalt−hydrogen is a key factor in evaluating the suitability of basalt for hydrogen storage. This paper investigates the geochemical interactions of hydrogen−basalt− water and evaluates the impact on basalt's physical properties. Basalt samples collected from the CarbFix site in Iceland are treated with hydrogen−water for 108 days under 9.65 MPa at 348 K, and various analytical methods are employed. The results show minor dissolution of plagioclase minerals after hydrogen treatment due to the redox reactions of hydrogen. However, this dissolution behavior might contribute to the precipitation of calcium on the basalt surface. Images obtained from scanning electron microscopy reveal that only the filling of the cracks was removed after the treatment with no obvious crack growth, which resulted in a minor increase in the pores (4%). Contact angle measurements show that the surface wettability remains water-wet after the treatment. A blank nitrogen− DI water test is performed, to reveal the potential reactions between water and basalt, indicating that only minor changes exist. We conclude that the reactivity of basaltic minerals to hydrogen−water injection is low; thus, the suitability of basalt for hydrogen storage is promising. This work can be a suitable experimental framework to assist in evaluating the hydrogen reactivity to basaltic rocks and assessing the suitability for UHS.

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Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 99%

Basalt–Hydrogen–Water Interactions at Geo-Storage Conditions

Al-Yaseri,

Fatah,

Amao

et al. 2023

Energy Fuels

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“…Generally, higher temperatures and pressures correspond to a stronger degree of reaction, especially when CO 2 reaches a supercritical state (31.05 °C, 7.38 MPa). ,,, Supercritical CO 2 can not only induce corrosion and dissolution of inorganic minerals in shale but also act as an organic solvent to dissolve and extract organic matter in shale. Thus, compared with subcritical CO 2 (SubCO 2 ), the chemical reaction between ScCO 2 and shale causes more significant alterations in the minerals of shale. − The higher the pressure, the greater the amount of CO 2 dissolved in the water, resulting in a lower pH of the acid solution (Figure ); thereby the dissolution ability of the acid solution on the minerals in shale can be enhanced. However, the temperature shows a complicated impact on the mineral alterations.…”

Section: Alterations In Physical and Chemical Properties Of Shalementioning

confidence: 99%

Comprehensive Review of Property Alterations Induced by CO₂–Shale Interaction: Implications for CO₂ Sequestration in Shale

et al. 2022

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CO2–shale interaction performs a crucial role in determining the capacity and leakage risk of CO2 storage in shale reservoirs. In this paper, the alterations of physical and chemical properties of shale triggered by CO2–shale interaction are reviewed, and then the implications for CO2 sequestration in shale formations are discussed. CO2–shale interaction induced the mineral alterations in shale and then further induced the pore structure alterations. The pore structure alterations are mainly controlled by mineral dissolution/precipitation and extraction and CO2 adsorption induced swelling in shale, which is closely related to the reservoir pressures and temperatures. Furthermore, the mineral and pore structure alterations may also influence the wetting behavior of shale. After CO2 exposure, the contact angle of shale increased, indicated the weakening in the hydrophilicity of the shale surface. The microscopic property alterations induced the macroscopic mechanical properties of shale to be weakened after CO2–shale interaction. The permeability variation of shale is significantly influenced by chemical–mechanical coupling effects including mineral dissolution/precipitation, adsorption induced swelling, wettability, and mechanical weakening induced by CO2–shale interaction. The shale property alterations will ultimately affect the CO2 storage capacity and security in shale. Future research needs to focus on the CO2–shale interaction covering multiple spatial and temporal scales at in situ conditions and considering the chemical–mechanical coupling effect on CO2 sequestration in shale.

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“…Another important aspect of scCO2 is its reactivity with shale matrix [11][12][13][14][15]. Dissolution of carbonate minerals in the presence of water, caused by carbonic acid, has an important role on altering the micro-structure of shale rocks 15].…”

Section: Introductionmentioning

confidence: 99%

Effects of Supercritical CO2 on Matrix Permeability of Unconventional Formations

2021

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We studied the effects of supercritical carbon dioxide (scCO2) on the matrix permeability of reservoir rocks from the Eagle Ford, Utica, and Wolfcamp formations. We measured permeability using argon before exposure of the samples to scCO2 over time periods ranging from days to weeks. We measured permeability (and the change of permeability with confining pressure) when both argon and scCO2 were the pore fluids. In all three formations, we generally observe a negative correlation between initial permeability and carbonate content – the higher the carbonate content, the lower the initial permeability. In clay- and organic-rich samples, swelling of the matrix resulting from adsorption decreased the permeability by about 50% when the pore fluid was scCO2 although this permeability change is largely reversible. In carbonate-rich samples, dissolution of carbonate minerals by carbonic acid irreversibly increased matrix permeability, in some cases by more than one order of magnitude. This dissolution also increases the pressure dependence of permeability apparently due to enhanced mechanical compaction. Despite these trends, we observed no general correlation between mineralogy and the magnitude of the change in permeability with argon before and after exposure to scCO2. Flow of scCO2 through mm-scale cracks appears to play an important role in determining matrix permeability and the pressure dependence of permeability. Extended permeability measurements show that while adsorption is nearly instantaneous and reversible, dissolution is time-dependent, probably owing to reaction kinetics. Our results indicate that the composition and microstructure of matrix flow pathways control both the initial permeability and how permeability changes after interaction with scCO2. Electron microscopy images with Back-Scattered Electron (BSE) and Energy Dispersive Spectroscopy (EDS) revealed dissolution and etching of calcite minerals and precipitation of calcium sulfide resulting from exposure to scCO2.

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The Effect of Supercritical CO2 on Shaly Caprocks

Cited by 20 publications

References 49 publications

Basalt–Hydrogen–Water Interactions at Geo-Storage Conditions

Basalt–Hydrogen–Water Interactions at Geo-Storage Conditions

Comprehensive Review of Property Alterations Induced by CO₂–Shale Interaction: Implications for CO₂ Sequestration in Shale

Effects of Supercritical CO2 on Matrix Permeability of Unconventional Formations

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The Effect of Supercritical CO2 on Shaly Caprocks

Cited by 20 publications

References 49 publications

Basalt–Hydrogen–Water Interactions at Geo-Storage Conditions

Basalt–Hydrogen–Water Interactions at Geo-Storage Conditions

Comprehensive Review of Property Alterations Induced by CO2–Shale Interaction: Implications for CO2 Sequestration in Shale

Effects of Supercritical CO2 on Matrix Permeability of Unconventional Formations

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Comprehensive Review of Property Alterations Induced by CO₂–Shale Interaction: Implications for CO₂ Sequestration in Shale