Abstract
Subsurface immobilization and conversion of CO2 into solid mineral phases in deep siliciclastic saline formations containing silicate minerals, commonly known as “mineral trapping”, is gaining research attention as a significant option to reduce CO2 emissions in the atmosphere. Although mineral trapping of CO2 is a long-term process, a combination of short-term results from both laboratory experiments and numerical simulations can lead to some general understanding of the required long-term CO2 sequestration mechanisms. This is a 100 year preliminary batch simulation study of four sandstone samples, under CO2 saturated water at 75 °C from the Upper Permian formations in the Ordos Basin, using the TOUGHREACT/ECO2N module to simulate the CO2-brine-rock interaction processes in deep siliciclastic multilayered saline aquifers. The samples approximately correspond to the four target saline formations selected by the Shenhua Group for a CO2 sequestration field demonstration project in the Ordos Basin, PR China. Preliminary simulation results show that the initial salinity of formation brine plays a significant role in determining the amount of CO2 that will be sequestered by solubility or mineral trapping in a deep saline aquifer. Minimal differences between experimental results and numerical calculation occur in low salinity waters, and significantly larger differences in high salinity waters, which is still under the maximum acceptable difference between experimental and computed data (10 %). The upper Liujiagou formation, with the highest level of salinity (ca. 88.7 g/L TDS) and lowest level of CO2 solubility, offers the highest mineral trapping capacity, with a maximum carbonate mineral storage of ca. 0.7 kg/m3 of bulk rock over a 100 year period. Regardless of the initial acidity or alkalinity of the aquifer brine, injection of CO2 will inflict a sudden drop in pH of the brine to acidity levels in a range of 3.0–4.6. The subsequent amount of dissolved and precipitated minerals, arising from the CO2-brine-rock interaction, is site specific and mainly dependent on initial aquifer mineralogy and brine composition.
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Abbreviations
- A n :
-
Specific reactive surface area per kg H2O of mineral n (m2/kg H2O)
- C :
-
Component concentration (mol/L)
- E a :
-
Activation energy (J)
- K :
-
Equilibrium constant (–)
- K 0 :
-
Thermodynamic equilibrium constant for each component (CO2 and H2O) at the conditions of reference pressure P 0 (equals to 1 bar) and temperature T (–)
- k :
-
Permeability (m2)
- k n :
-
Rate constant of mineral n (–)
- \(\mathop k\limits^{ = }\) :
-
Rate constant when reaction mechanisms are considered (–)
- \(\bar{k}_{25}\) :
-
Rate constant at 25 °C (–)
- N p :
-
Number of minerals (–)
- N c :
-
Number of components (–)
- P :
-
Pressure (Pa)
- R :
-
Gas constant (–)
- \(\gamma_{x}^{\prime }\) :
-
Activity coefficient for aqueous CO2 (–)
- T :
-
Temperature (°C)
- \(\bar{V}\) :
-
Average partial molar volume of each phase (CO2 or water) (m3/mol)
- X :
-
Mass fraction (–)
- \(x_{{{\text{CO}}_{ 2} }}\) :
-
CO2 mole fraction in the aqueous phase (–)
- \(y_{{{\text{H}}_{ 2} {\text{O}}}}\) :
-
Water mole fraction in the CO2-rich phase (–)
- α :
-
Ionic activity (mol/m3)
- γ :
-
Activity coefficient (–)
- η :
-
Fitting parameter in kinetic rate equation (–)
- θ :
-
Fitting parameter in kinetic rate equation (–)
- \(\varPhi\) :
-
Fugacity coefficient of each component in the CO2-rich phase (–)
- Ω :
-
Mineral saturation ratio (–)
- c :
-
CO2
- j :
-
Primary chemical component
- n :
-
Power term in rate constant equation under consideration of reaction mechanisms
- m :
-
Minerals under equilibrium state
- n :
-
Minerals under kinetic rate control state
- nu, H, OH:
-
Reaction is under neutral, acid and base mechanism, respectively
- H2O, CO2 :
-
Components of H2O and CO2, respectively
- CO2 (g):
-
CO2 component in gaseous phase
- tot:
-
Total amount
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Acknowledgments
The work presented in this paper was funded by the Chinese Ministry of Science and Technology (Grant 2012DFA60760) in joint co-operation with the German Research Foundation (DFG) and the National Natural Science Foundation of China (NSFC) (Grant GZ573). We also want to show our special appreciation to the China Scholarship Council (CSC) for the financial support. We would like to express our gratitude to the Institute of Rock and Soil Mechanics in Wuhan, the Chinese Academy of Sciences and the China Shenhua Group Co. LTD for their basic data support. We would also like to show our gratitude to Professor Tianfu Xu from Jilin University for his invaluable time to guide the use of TOUGHREACT simulator.
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Liu, H., Hou, Z., Were, P. et al. Modelling CO2-brine-rock interactions in the Upper Paleozoic formations of Ordos Basin used for CO2 sequestration. Environ Earth Sci 73, 2205–2222 (2015). https://doi.org/10.1007/s12665-014-3571-4
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DOI: https://doi.org/10.1007/s12665-014-3571-4