Experimental investigation of trace element dissolution in formation water in the presence of supercritical CO2 fluid for a potential geological storage site of CO2 in Taiwan

Jean, Jiin-Shuh; Wang, Chien Lih; Hsiang, Hsing I.; Li, Zhaohui; Yang, Huai Jen; Jiang, Wei Teh; Kang, Yang; Bundschuh, Jochen

doi:10.1016/j.jngse.2015.02.006

Cited by 22 publications

(7 citation statements)

References 27 publications

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“…In this study, we designed a unique experiment to react sandstone fragments (without grinding) with saline water and supercritical CO 2 for 20, 40, 60, and 80 d in a time series, from which the reacted water and sandstone fragment samples were collected for measurements of dissolved trace elements and mineral composition. This unique experimental approach is different from that of our previous study (Jean et al, 2015), in which the reaction times among saline water-rock-CO 2 interactions were set to be constant at 20 d. The aim of this research was to understand (1) the extent to which trace elements are released from sandstone and the effect on the quality of drinking water as well as (2) the effect of supercritical carbon dioxide (scCO 2 ) on the chemical characteristics and mineral composition of sandstone after the rock-water-scCO 2 interactions. This information can provide the basis for site selection in terms of in-situ environmental conditions to secure the safe geological sequestration of CO 2 .…”

Section: Introductionmentioning

confidence: 75%

“…Several studies (Kaszuba et al, 2005;Bertier et al, 2006;Lin et al, 2008;Carroll et al, 2011b;Rempel et al, 2011;Jean et al, 2015;Jean et al, 2016;Rathnaweera et al, 2016) have been conducted to experimentally evaluate the interactions in water-rock-supercritical CO 2 mineral systems under geologic CO 2 sequestration conditions. After injection of CO 2 , CO 2 will dissolve into the local formation water and generate a variety of geochemical reactions .…”

Section: Introductionmentioning

confidence: 99%

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Salinity-enhanced Release of Trace Metals from Sandstone and Variations in Mineral Compositions after Water-rock Interactions in the Presence of Supercritical CO2

Jean

Lin

et al. 2019

Aerosol Air Qual. Res.

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This research is aimed toward an understanding of the effects of the chemical characteristics and mineral compositions of sandstone and formation water based on saline water-rock-supercritical CO 2 interaction simulation experiments. These experiments were conducted to assess whether toxic trace elements could be dissolved and released in formation water from sandstone in a CO 2 storage layer after CO 2 geological sequestration, thus affecting groundwater quality. The experimental results reveal that the concentrations of Cd and Pb in the water under examination exceeded the national primary drinking standard as a result of saline/fresh water-rock-supercritical CO 2 interactions after 40 d of sandstone immersion in saline/fresh water and 20 d of interaction. In addition, the Mn concentration in the saline/fresh water exceeded the national secondary drinking standard after 40 d of sandstone immersion and 20-80 d of interaction. However, Cd, Pb, and Mn were released to a greater extent (in terms of concentration, 2-fold for Cd, 7-fold for Pb, and 1.7-fold for Mn) in the presence of salinity, revealing that salinity may enhance the dissolution of Cd, Pb, and Mn after 20 d of saline water-rock-scCO 2 interaction. After a long period of supercritical CO 2 -sandstone interaction, the trace metals previously mobilized can be immobilized again by an increase in alkalinity due to aragonite dissolution.

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Section: Introductionmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Salinity-enhanced Release of Trace Metals from Sandstone and Variations in Mineral Compositions after Water-rock Interactions in the Presence of Supercritical CO2

Jean

Lin

et al. 2019

Aerosol Air Qual. Res.

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“…34 The increasing and decreasing trends of D 1 and D 2 of the UB and LB shale after CO 2 saturation is mainly the result of the combined effects of dissolution or precipitation and the CO 2 -adsorption induced swelling, which correlates with the variations in the pore structures. 33,34,77,78 Previous studies have shown that D 1 has a positive correlation with specific surface area and that D 2 has a negative correlation with the average pore size. 14,34 The dissolution of organic matter or clay minerals in the shale after CO 2 saturation causes some of the micropores to disappear and convert into meso-and macropores, thereby increasing and decreasing specific surface area and D 1 .…”

Section: Discussionmentioning

confidence: 98%

Pore Structure Alteration of Organic-Rich Shale with Sc-CO₂ Exposure: the Bakken Formation

et al. 2021

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The interaction between various components of shale and CO 2 is interesting since it alters pore structures that are the governing factor in different projects. In this study, samples from the Upper (UB) and Lower (LB) Bakken were exposed to super critical CO 2 for 3, 8, 16, 30, and 60 days. Then, chemical and structural changes during the process of exposure were evaluated with different methods, including X-ray diffraction (XRD), gas adsorption (N 2 ) isotherm, and fractal theory. The results showed that quartz increased in the UB and decreased in the LB, whereas clay and other minerals had a decreasing trend for both UB and LB after CO 2 saturation. After saturation, the pore size distributions (PSDs) were skewed to smaller pore sizes at all diameters, indicating that the number of pores decreased as a result of the reaction. Fractal dimension has an increasing trend as the samples were exposed to CO 2 , where the roughness of the pore surface and the complexity of pore structure increased after 8−16 days of CO 2 saturation and then decreased after 30−60 days of saturation to become more homogeneous. Furthermore, clay mineral dissolution enhanced the pore volume, and carbonate dissolution increased the specific surface area. These results provided experimental evidence to further test the mechanisms of geological storage of CO 2 in organic-rich self-sourced plays.

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“…During CO 2 injection, carbonic acid can also mobilize major and trace elements, affecting the physical structure of shales [75][76][77]. Recently, a study by Luo et al [50] concluded that the hydrolysis and carbonation of silicate minerals is the main cause of element mobilization; minerals such as calcite, calcium, magnesium, sodium, potassium, and aluminum could face varying degrees of mobilization, which is controlled by the mineral composition and occurrence.…”

Section: Mineral Compositionmentioning

confidence: 99%

A Review on the Influence of CO2/Shale Interaction on Shale Properties: Implications of CCS in Shales

et al. 2020

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Carbon capture and storage (CCS) is a developed technology to minimize CO2 emissions and reduce global climate change. Currently, shale gas formations are considered as a suitable target for CO2 sequestration projects predominantly due to their wide availability. Compared to conventional geological formations including saline aquifers and coal seams, depleted shale formations provide larger storage potential due to the high adsorption capacity of CO2 compared to methane in the shale formation. However, the injected CO2 causes possible geochemical interactions with the shale formation during storage applications and CO2 enhanced shale gas recovery (ESGR) processes. The CO2/shale interaction is a key factor for the efficiency of CO2 storage in shale formations, as it can significantly alter the shale properties. The formation of carbonic acid from CO2 dissolution is the main cause for the alterations in the physical, chemical and mechanical properties of the shale, which in return affects the storage capacity, pore properties, and fluid transport. Therefore, in this paper, the effect of CO2 exposure on shale properties is comprehensively reviewed, to gain an in-depth understanding of the impact of CO2/shale interaction on shale properties. This paper reviews the current knowledge of the CO2/shale interactions and describes the results achieved to date. The pore structure is one of the most affected properties by CO2/shale interactions; several scholars indicated that the differences in mineral composition for shales would result in wide variations in pore structure system. A noticeable reduction in specific surface area of shales was observed after CO2 treatment, which in the long-term could decrease CO2 adsorption capacity, affecting the CO2 storage efficiency. Other factors including shale sedimentary, pressure and temperature can also alter the pore system and decrease the shale “caprock” seal efficiency. Similarly, the alteration in shales’ surface chemistry and functional species after CO2 treatment may increase the adsorption capacity of CO2, impacting the overall storage potential in shales. Furthermore, the injection of CO2 into shales may also influence the wetting behavior. Surface wettability is mainly affected by the presented minerals in shale, and less affected by brine salinity, temperature, organic content, and thermal maturity. Mainly, shales have strong water-wetting behavior in the presence of hydrocarbons, however, the alteration in shale’s wettability towards CO2-wet will significantly minimize CO2 storage capacities, and affect the sealing efficiency of caprock. The CO2/shale interactions were also found to cause noticeable degradation in shales’ mechanical properties. CO2 injection can weaken shale, decrease its brittleness and increases its plasticity and toughness. Various reductions in tri-axial compressive strength, tensile strength, and the elastic modulus of shales were observed after CO2 injection, due to the dissolution effect and adsorption strain within the pores. Based on this review, we conclude that CO2/shale interaction is a significant factor for the efficiency of CCS. However, due to the heterogeneity of shales, further studies are needed to include various shale formations and identify how different shales’ mineralogy could affect the CO2 storage capacity in the long-term.

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Experimental investigation of trace element dissolution in formation water in the presence of supercritical CO2 fluid for a potential geological storage site of CO2 in Taiwan

Cited by 22 publications

References 27 publications

Salinity-enhanced Release of Trace Metals from Sandstone and Variations in Mineral Compositions after Water-rock Interactions in the Presence of Supercritical CO2

Salinity-enhanced Release of Trace Metals from Sandstone and Variations in Mineral Compositions after Water-rock Interactions in the Presence of Supercritical CO2

Pore Structure Alteration of Organic-Rich Shale with Sc-CO₂ Exposure: the Bakken Formation

A Review on the Influence of CO2/Shale Interaction on Shale Properties: Implications of CCS in Shales

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Experimental investigation of trace element dissolution in formation water in the presence of supercritical CO2 fluid for a potential geological storage site of CO2 in Taiwan

Cited by 22 publications

References 27 publications

Salinity-enhanced Release of Trace Metals from Sandstone and Variations in Mineral Compositions after Water-rock Interactions in the Presence of Supercritical CO2

Salinity-enhanced Release of Trace Metals from Sandstone and Variations in Mineral Compositions after Water-rock Interactions in the Presence of Supercritical CO2

Pore Structure Alteration of Organic-Rich Shale with Sc-CO2 Exposure: the Bakken Formation

A Review on the Influence of CO2/Shale Interaction on Shale Properties: Implications of CCS in Shales

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Pore Structure Alteration of Organic-Rich Shale with Sc-CO₂ Exposure: the Bakken Formation