Modelling leakage and groundwater pollution in a hypothetical CO2 sequestration project

Schwartz, Michael O.

doi:10.1016/j.ijggc.2014.02.005

Cited by 16 publications

(8 citation statements)

References 31 publications

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“…The calculations are performed with an expanded THER-MODDEM thermodynamic database (Blanc et al 2012) using all aqueous species of the elements shown in Table 3. The modification consists of adding surface complexation reactions with illite and dissociation reactions of UO 2.69 (solid phase) and galena with a Gibbs free energy of formation of -20.7 kcal/mol (Schwartz 2014). Furthermore, some new additions are necessary (Table 4 and 5):…”

Section: Initialisation Of Reactive-transport Conditionsmentioning

confidence: 99%

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Modelling the hypothetical methane-leakage in a shale-gas project and the impact on groundwater quality

Schwartz

2014

Environ Earth Sci

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The hypothetical leakage of methane gas caused by fracking a 1,000-m deep Cretaceous claystone horizon at Damme, Germany, is simulated in a TOUGH-REACT reactive-transport model with 5,728 elements. A hypothetical leakage zone connects the Cretaceous horizon with a Quaternary potable-water aquifer (q1). Methane gas rises up to the q1 horizon in less than 2 days in all calculated scenarios. The simulations include the major constituents of groundwater as well as the seven most hazardous trace components that are natural constituents of groundwater (As, Cd, Cr, Ni, Pb, Se and U). The general trend is characterised by depletion of the natural hazardous components with decreasing acidity and oxygen fugacity in the relevant pH range (7-9). Nevertheless, the concentrations of elements whose dominant aqueous species are negatively charged in this pH range (Cr and Se) rise against the general trend due to desorption reactions. Slight enhancement effects are produced by the dissolution of contaminant-bearing oxides such as Cr-bearing goethite. In summary, the geological risks of a fracking operation are minor. The technical risks are more important. This is especially the case when rising methane gas gets into contact with fracking fluid that accidentally escapes through faulty well seals.

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Section: Initialisation Of Reactive-transport Conditionsmentioning

confidence: 99%

“…The site density (5.8 9 10 -6 mol/m 2 ) as well as some surface-complexation equilibrium constants are taken from a compilation of Schwartz (2014), other sources being Gu and Evans (2007) and Scott (2010). The surface area for surface complexation onto illite is a calibrated maximum value.…”

Section: Initialisation Of Reactive-transport Conditionsmentioning

confidence: 99%

Modelling the hypothetical methane-leakage in a shale-gas project and the impact on groundwater quality

Schwartz

2014

Environ Earth Sci

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“…The most frequently proposed procedure is the injection of supercritical CO 2 into a sandstone aquifer. However, this poses a considerable risk that the CO 2 may leak to a near-surface aquifer and pollute the groundwater ( [1], and references therein). In a sandstone aquifer, there are hardly any mineral components that react with CO 2 to produce stable carbonate mineral phases within a reasonably short time (<1000 years; [2]).…”

Section: Introductionmentioning

confidence: 99%

Can CO₂ sequestration in basalt efficiently reduce greenhouse gas emission?

Schwartz

2020

Environmental Technology

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The research on the Columbia River Basalt is a unique combination of projects that minimise CO 2 emissions to the atmosphere. Both are underground waste disposal projects: CO 2 waste versus nuclear waste. The recent Wallula CO 2 project and the previous nuclear-waste project in the Columbia River Basalt (CRB), USA, provide the database for a high-capacity CO 2 sequestration model. Due to geomechanical constraints, the injection rate of CO 2 sequestration must be limited in order not to jeopardise the integrity of the reservoir and cap rock. The interbed in the continental flood basalt tested in the Wallula project only allows injection at a rate in the range of 9-19 kg CO 2 /s, depending on permeability (4 × 10 −14-10 −13 m 2) and porosity (0.1-0.15). At the end of a 50-year injection period, the fraction of CO 2 converted to carbonate minerals is 37.1-67.1%. Underground space for waste disposal is a rare asset. The Columbia River Basalt occupies an area of 200,000 km 2. Fifty years of CO 2 sequestration from a single well would require about the same fraction of the area as that of a nuclear waste repository (0.025%). The repository design is for a capacity of 70,000 MTHM (metric tons heavy metal). If all the waste is spent nuclear fuel, it originates from 1.2 × 10 4-8.4 × 10 4 TWh electric power production, depending on reactor type. The CO 2 injection well operating at maximum capacity (19 kg CO 2 /s) represents 50 TWh generated in a gas power station minus the energy consumed for CO 2 separation, i.e. less than 0.4% of the nuclear option.

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“…The ability to predict important properties of CO2 will further enhance its monitoring and control in geological carbon sequestration. For example, fear has been raised over the likelihood of leakage of CO2 from geological carbon sequestration site (Abidoye and Das 2014a; Das et al 2014;Little and Jackson, 2010;Schwartz 2014). As a result, a number of approaches have been developed to counteract the possibility of leakage.…”

Section: Introductionmentioning

confidence: 99%

ANN-derived equation and ITS application in the prediction of dielectric properties of pure and impure CO2

Abidoye

Mahdi

Idris

et al. 2018

Journal of Cleaner Production

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Modelling leakage and groundwater pollution in a hypothetical CO2 sequestration project

Cited by 16 publications

References 31 publications

Modelling the hypothetical methane-leakage in a shale-gas project and the impact on groundwater quality

Modelling the hypothetical methane-leakage in a shale-gas project and the impact on groundwater quality

Can CO₂ sequestration in basalt efficiently reduce greenhouse gas emission?

ANN-derived equation and ITS application in the prediction of dielectric properties of pure and impure CO2

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Modelling leakage and groundwater pollution in a hypothetical CO2 sequestration project

Cited by 16 publications

References 31 publications

Modelling the hypothetical methane-leakage in a shale-gas project and the impact on groundwater quality

Modelling the hypothetical methane-leakage in a shale-gas project and the impact on groundwater quality

Can CO2 sequestration in basalt efficiently reduce greenhouse gas emission?

ANN-derived equation and ITS application in the prediction of dielectric properties of pure and impure CO2

Contact Info

Product

Resources

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Can CO₂ sequestration in basalt efficiently reduce greenhouse gas emission?