Caprock interaction with CO2: A laboratory study of reactivity of shale with supercritical CO2 and brine

Alemu, Binyam Lema; Aagaard, Per; Munz, I. A.; Skurtveit, Elin

doi:10.1016/j.apgeochem.2011.06.028

Cited by 169 publications

(90 citation statements)

References 55 publications

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“…The identification of the scCO 2 -rock-pore water geochemical reaction at scCO 2 sequestration conditions has been studied by various analytical processes. These approaches include qualitative processes mostly depending on visual inspection or compositional analysis using SEM/EDS (Scanning Electron Microscope/Energy Dispersive X-ray Spectrometer; VEGA II LSU, Tescan, Brno, Czech Republic), XRD (X-ray Diffractometer; X Pert-MPD, Philips, Eindhoven, The Netherlands), and XRF (X-ray Fluorescence Spectrometer; XRF-1800, Shimadzu, Kyoto, Japan) [45,46]. However, quantitative information acquired from this study was very limited, such as in mineral composition transfer and structural change [47,48].…”

Section: Figurementioning

confidence: 99%

The Use of the Surface Roughness Value to Quantify the Extent of Supercritical CO2 Involved Geochemical Reaction at a CO2 Sequestration Site

et al. 2017

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Changes in the physical properties of the supercritical CO 2 (scCO 2 ) reservoir rock is one of the most important factors in controlling the storage safety at a scCO 2 sequestration site. According to recent studies, it is probable that geochemical reactions influence changes in the rock properties after a CO 2 injection in the subsurface, but quantitative data that reveal the interrelationship of the factors involved and the parameters needed to evaluate the extent of scCO 2 -rock-groundwater reactions have not yet been presented. In this study, the potential for employing the surface roughness value (SR RMS ) to quantify the extent of the scCO 2 involved reaction was evaluated by lab-scale experiments. For a total of 150 days of a simulation of the scCO 2 -sandstone-groundwater reaction at 100 bar and 50 • C, the trends in changes in the physical rock properties, pH change, and cation concentration change followed similar logarithmic patterns that were significantly correlated with the logarithmic increase in the SR RMS value. These findings suggest that changes in surface roughness can quantify the extent of the geochemical weathering process and can be used to evaluate leakage safety due to the progressive changes in rock properties at scCO 2 storage sites.

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Section: Figurementioning

confidence: 99%

The Use of the Surface Roughness Value to Quantify the Extent of Supercritical CO2 Involved Geochemical Reaction at a CO2 Sequestration Site

et al. 2017

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“…Batch experiments were conducted from 80 to 300 bar of pCO 2 and from 50 to 250 • C for about 2 months to study the reactivity of different shales under supercritical CO 2 conditions (Kaszuba et al, 2005;Kohler et al, 2009;Alemu et al, 2011;Credoz et al, 2011;Liu et al, 2012;Garrido et al, 2013), showing significant mineral alterations and changes in pore volume owing to dissolution and precipitation of carbonate and clay minerals, illitization of smectite and formation of swelling clays.…”

Section: Introductionmentioning

confidence: 99%

Interaction between a fractured marl caprock and CO2-rich sulfate solution under supercritical CO2 conditions

Dávila

Luquot

Soler

et al. 2016

International Journal of Greenhouse Gas Control

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Please cite this article in press as: Dávila, G., et al., Interaction between a fractured marl caprock and CO 2 -rich sulfate solution under supercritical CO 2 conditions. Int. J. Greenhouse Gas Control (2015), http://dx.doi.org/10.1016/j.ijggc.2015.11.005 Geological CO 2 sequestration at pilot-plant scale will be developed at Hontomín (Spain). CO 2 will be injected into a limestone reservoir that contains a NaCl-and sulfate-rich groundwater in equilibrium with calcite and gypsum. The caprock site is composed of marl. The present study seeks to evaluate the interaction between the Hontomín marl and CO 2 -rich sulfate solutions under supercritical CO 2 conditions (P Total = 150 bar, pCO 2 = 61 bar and T = 60 • C). Flow-through percolation experiments were performed using artificially fractured cores to elucidate (i) the role of the composition of the injected solutions (S-free and S-rich solutions) and (ii) the effect of the flow rate (0.2, 1 and 60 mL h −1 ) on fracture permeability. Major dissolution of calcite (S-free and S-rich solutions) and precipitation of gypsum (S-rich solution) together with minor dissolution of the silicate minerals contributed to the formation of an altered skeleton-like zone (mainly made up of unreacted clays) along the fracture walls. Dissolution patterns changed from face dissolution to wormhole formation and uniform dissolution with increasing Peclet numbers. ARTICLE IN PRESSIn S-free experiments, fracture permeability did not significantly change regardless of the flow rate despite the fact that a large amount of calcite dissolved. In S-rich solution experiments, fracture permeability decreased under slow flow rates (0.2 and 1 mL h −1 ) because of gypsum precipitation that sealed the fracture. At the highest flow rate (60 mL h −1 ), fracture permeability increased because calcite dissolution predominated over gypsum precipitation.

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“…, whereas the activation energy for the dissolution of illite in the water is 46 kJ·mol −1 (Alemu et al, 2011). This difference indicates that illite has an intermediate state that can reduce the activation energy for dissolution, namely, an intermediate state activated complex.…”

Section: Ion Release Mechanismmentioning

confidence: 89%

“…The reaction liquid (10 mL) was collected every 2 d and acidified with HNO 3 to maintain all of the ions in the solution for later chemical analyses (Alemu et al, 2011). After the reaction, the solid samples were removed from the sample cell and immediately vacuum dried at 50°C for at least 24 h.…”

Section: Methodsmentioning

confidence: 99%

Dissolution of Illite in Supercritical CO<sub>2</sub>–Saturated Water: Implications for Clayey Caprock Stability in CO<sub>2</sub> Geological Storage

Sang

Wang

et al. 2018

J. Chem. Eng. Japan / JCEJ

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A series of experimental simulations were conducted to study the e ects of supercritical CO 2 -water on the dissolution of illite under di erent burial depth conditions (1,000, 1,500, and 2,000 m). In addition, the mineral composition, crystalline structure, and uid composition were analyzed. The results indicate that illite dissolution is controlled by solid-liquid diffusion and surface chemical reactions. The elements that undergo metathesis are more easily released than the original xed elements in the crystal lattice, and the interlayer cations are released more easily than octahedral and tetrahedral ions. At deeper burial depths, the percentages of dissolved ions increase. After the reaction, the crystallinity of illite decreases, the proportion of amorphous material increases, and the morphology changes with damage to the lattice. Meanwhile, the dissolution of illite can contribute to the generation of diaspore and siderite.

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Caprock interaction with CO2: A laboratory study of reactivity of shale with supercritical CO2 and brine

Cited by 169 publications

References 55 publications

The Use of the Surface Roughness Value to Quantify the Extent of Supercritical CO2 Involved Geochemical Reaction at a CO2 Sequestration Site

The Use of the Surface Roughness Value to Quantify the Extent of Supercritical CO2 Involved Geochemical Reaction at a CO2 Sequestration Site

Interaction between a fractured marl caprock and CO2-rich sulfate solution under supercritical CO2 conditions

Dissolution of Illite in Supercritical CO<sub>2</sub>–Saturated Water: Implications for Clayey Caprock Stability in CO<sub>2</sub> Geological Storage

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