Understanding the chemico-mineralogical changes of caprock sealing in deep saline CO2 sequestration environments: A review study

Jayasekara, D.W.; Ranjith, P.G.; Wanniarachchi, W.A.M.; Rathnaweera, T.D.

doi:10.1016/j.supflu.2020.104819

Cited by 41 publications

(11 citation statements)

References 129 publications

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“…Understanding how wet supercritical CO 2 - and CH 4 (scCO 2 , scCH 4 )-rich fluids interact with subsurface minerals is important for optimizing carbon utilization and storage operations in the industrial sector, − where studies − have suggested that single phase hydrated scCO 2 can persist for appreciable periods of time after injection depending on a number of factors. For example, enhanced gas recovery (EGR) technologies are moving toward CO 2 as an alternative to water-based fracking fluids to tap difficult-to-recover gas from tight shale reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Coupling of CO₂ and H₂O during Expansion of Clays in Supercritical CO₂–CH₄ Fluid Mixtures

Loring

Qafoku

Thompson

et al. 2021

Environ. Sci. Technol.

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We used IR and XRD, with supporting theoretical calculations, to investigate the swelling behavior of Na+-, NH4 +-, and Cs+-montmorillonites (SWy-2) in supercritical fluid mixtures of H2O, CO2, and CH4. Building on our prior work with Na-clay that demonstrated that H2O facilitated CO2 intercalation at relatively low RH, here we show that increasing CO2/CH4 ratios promote H2O intercalation and swelling of the Na-clay at progressively lower RH. In contrast to the Na-clay, CO2 intercalated and expanded the Cs-clay even in the absence of H2O, while increasing fluid CO2/CH4 ratios inhibited H2O intercalation. The NH4-clay displayed intermediate behavior. By comparing changes in the HOH bending vibration of H2O intercalated in the Cs-, NH4-, and Na-clays, we posit that CO2 facilitated expansion of the Na-clay by participating in outer-sphere solvation of Na+ and by disrupting the H-bond network of intercalated H2O. In no case did the pure CH4 fluid induce expansion. Our experimental data can benchmark modeling studies aimed at predicting clay expansion in humidified fluids with varying ratios of CO2 and CH4 in real reservoir systems with implications for enhanced hydrocarbon recovery and CO2 storage in subsurface environments.

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Section: Introductionmentioning

confidence: 99%

Synergistic Coupling of CO₂ and H₂O during Expansion of Clays in Supercritical CO₂–CH₄ Fluid Mixtures

Loring

Qafoku

Thompson

et al. 2021

Environ. Sci. Technol.

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“…Therefore, it is crucial to study caprock integrity to ensure effective CO 2 storage, as summarized by Jayasekara et al The maximum pressure that the caprock can withstand also determines the maximum depth at which CO 2 can be injected, and exceeding this limit can cause fractures in the caprock . On the other hand, injecting CO 2 at a shallow depth may result in insufficient pressure and temperature to convert CO 2 into a liquid or supercritical state, leading to a high risk of leakage .…”

Section: Trapping Mechanismmentioning

confidence: 99%

Recent Advances in Geological Storage: Trapping Mechanisms, Storage Sites, Projects, and Application of Machine Learning

Feng

et al. 2023

Energy Fuels

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A significant amount of carbon dioxide (CO2) is being released into the atmosphere as a result of the acceleration of industrialization and increased energy consumption, which are causing a rise in world temperatures. Despite the fact that nations all over the world have actively participated in CO2 storage projects, there is still not enough to moderate global temperatures. Therefore, there is an urgent need for the development of CO2 sequestration technologies. The main geological storage trapping mechanisms are discussed in this work along with an analysis of the major influencing variables. Additionally, the benefits and drawbacks of significant storage locations and current research hotspots are explored. Storage project development across the globe is outlined. The use of machine learning for CO2 sequestration is reviewed toward the end. This extensive review reveals that the main variables affecting CO2 capture capacity are hydrodynamic and geochemical. The sequestration capability of various storage sites is significantly influenced by the reservoir characteristics and implementation methodologies. The successful implementation of the storage project is determined by local policies and public support. The development of machine learning technologies makes storage projects safer and more dependable.

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“…The mineral evolution of carbonate reservoirs in a deep CO 2 sequestration environment is a complex process (Jayasekara et al, 2020). Calcite and dolomite are assemblages of various minerals with abundant natural pore channels.…”

Section: Mineral Transformation Analysismentioning

confidence: 99%

Dissolution and Deformation Characteristics of Limestones Containing Different Calcite and Dolomite Content Induced by CO₂‐Water‐Rock Interaction

CHEN

Tan

et al. 2023

Acta Geologica Sinica (Eng)

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To investigate the impacts of mineral composition on physical and mechanical properties of carbonate rocks, limestone specimens containing different contents in calcite and dolomite are selected to perform CO2‐water‐rock reaction experiments. The X‐ray Diffraction (XRD) and Nuclear Magnetic Resonance (NMR) are carried out to examine the change characteristics of mineral dissolution and pore structure after reaction. The core flooding experiments with Fiber Bragg gratings are implemented to examine the stress sensitivity of carbonate rocks. The results show that the limestones containing pure calcite are more susceptible to acid dissolution compared to limestone containing impure dolomite. The calcite content in pure limestone decreases as the reaction undergoes. The dissolution of dolomite leads to the formation of calcite in impure limestone. Calcite dissolution leads to the formation of macropore and flow channels in pure limestone, while the effects of impure dolomite in impure limestone results in mesopore formation. When confining pressure is lower than 12 MPa, pure limestones demonstrate higher strain sensitivity coefficients compared to impure limestone containing dolomite after reaction. When confining pressure exceeds 12 MPa, the strain sensitivity coefficients of both pure and impure limestones become almost equal.

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Understanding the chemico-mineralogical changes of caprock sealing in deep saline CO2 sequestration environments: A review study

Cited by 41 publications

References 129 publications

Synergistic Coupling of CO₂ and H₂O during Expansion of Clays in Supercritical CO₂–CH₄ Fluid Mixtures

Synergistic Coupling of CO₂ and H₂O during Expansion of Clays in Supercritical CO₂–CH₄ Fluid Mixtures

Recent Advances in Geological Storage: Trapping Mechanisms, Storage Sites, Projects, and Application of Machine Learning

Dissolution and Deformation Characteristics of Limestones Containing Different Calcite and Dolomite Content Induced by CO₂‐Water‐Rock Interaction

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Understanding the chemico-mineralogical changes of caprock sealing in deep saline CO2 sequestration environments: A review study

Cited by 41 publications

References 129 publications

Synergistic Coupling of CO2 and H2O during Expansion of Clays in Supercritical CO2–CH4 Fluid Mixtures

Synergistic Coupling of CO2 and H2O during Expansion of Clays in Supercritical CO2–CH4 Fluid Mixtures

Recent Advances in Geological Storage: Trapping Mechanisms, Storage Sites, Projects, and Application of Machine Learning

Dissolution and Deformation Characteristics of Limestones Containing Different Calcite and Dolomite Content Induced by CO2‐Water‐Rock Interaction

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Product

Resources

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Synergistic Coupling of CO₂ and H₂O during Expansion of Clays in Supercritical CO₂–CH₄ Fluid Mixtures

Synergistic Coupling of CO₂ and H₂O during Expansion of Clays in Supercritical CO₂–CH₄ Fluid Mixtures

Dissolution and Deformation Characteristics of Limestones Containing Different Calcite and Dolomite Content Induced by CO₂‐Water‐Rock Interaction