Alteration of the Fracture Behavior in Host Rock during CO2 Geological Sequestration

Ange-Therese Akono, Theodore T. Tsotsis, Charles J. Werth

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Our research objective is to understand the evolution of the fracture behavior of host rock during CO2 sequestration. We focus our study on the Mt. Simon sandstone as part of the Illinois Basin Decatur Project, Illinois, USA. We conduct microscopic scratch tests, ion chromatography tests, environmental back-scattered secondary electron microscopy, and machine learning modelling on both unaltered and altered Mt Simon sandstone. Alteration occurs via incubation in CO2-saturated brine for seven days at 2500 psi and 50 ℃. The size effect law is applied to extract the fracture parameters from the scratch test measurements. A decrease in fracture toughness and an increase in fracture process zone is observed following incubation of Mt Simon sandstone in CO2-saturated brine. Furthermore, microstructural changes are observed such as an increase in the overall porosity, an increase in pore throat sizes, and the formation of local porosity gradients. Evidence of K-feldspar dissolution is shown as well. Thus, scratch testing provides a means to quantify the changes in fracture response following potential CO2-induced geochemical reactions, making the method suitable for quality control and safety design in CO2 geological sequestration schemes.
Original languageEnglish (US)
Title of host publication10th International Conference on Fracture Mechanics of Concrete and Concrete Structures, FraMCoS-X
EditorsG Pijaudier-Cabot, P Grassl, C La Borderie
Number of pages10
DOIs
StatePublished - 2019

Fingerprint

host rock
sandstone
brine
incubation
porosity
fracture toughness
ion chromatography
size effect
electron microscopy
carbon sequestration
quality control
feldspar
dissolution
safety
basin
modeling
test

Cite this

Akono, A-T., Tsotsis, T. T., & Werth, C. J. (2019). Alteration of the Fracture Behavior in Host Rock during CO2 Geological Sequestration. In G. Pijaudier-Cabot, P. Grassl, & C. La Borderie (Eds.), 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures, FraMCoS-X https://doi.org/10.21012/FC10.235480
Akono, Ange-Therese ; Tsotsis, Theodore T. ; Werth, Charles J. / Alteration of the Fracture Behavior in Host Rock during CO2 Geological Sequestration. 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures, FraMCoS-X. editor / G Pijaudier-Cabot ; P Grassl ; C La Borderie . 2019.
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abstract = "Our research objective is to understand the evolution of the fracture behavior of host rock during CO2 sequestration. We focus our study on the Mt. Simon sandstone as part of the Illinois Basin Decatur Project, Illinois, USA. We conduct microscopic scratch tests, ion chromatography tests, environmental back-scattered secondary electron microscopy, and machine learning modelling on both unaltered and altered Mt Simon sandstone. Alteration occurs via incubation in CO2-saturated brine for seven days at 2500 psi and 50 ℃. The size effect law is applied to extract the fracture parameters from the scratch test measurements. A decrease in fracture toughness and an increase in fracture process zone is observed following incubation of Mt Simon sandstone in CO2-saturated brine. Furthermore, microstructural changes are observed such as an increase in the overall porosity, an increase in pore throat sizes, and the formation of local porosity gradients. Evidence of K-feldspar dissolution is shown as well. Thus, scratch testing provides a means to quantify the changes in fracture response following potential CO2-induced geochemical reactions, making the method suitable for quality control and safety design in CO2 geological sequestration schemes.",
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Akono, A-T, Tsotsis, TT & Werth, CJ 2019, Alteration of the Fracture Behavior in Host Rock during CO2 Geological Sequestration. in G Pijaudier-Cabot, P Grassl & C La Borderie (eds), 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures, FraMCoS-X. https://doi.org/10.21012/FC10.235480

Alteration of the Fracture Behavior in Host Rock during CO2 Geological Sequestration. / Akono, Ange-Therese; Tsotsis, Theodore T.; Werth, Charles J.

10th International Conference on Fracture Mechanics of Concrete and Concrete Structures, FraMCoS-X. ed. / G Pijaudier-Cabot; P Grassl; C La Borderie . 2019.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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N2 - Our research objective is to understand the evolution of the fracture behavior of host rock during CO2 sequestration. We focus our study on the Mt. Simon sandstone as part of the Illinois Basin Decatur Project, Illinois, USA. We conduct microscopic scratch tests, ion chromatography tests, environmental back-scattered secondary electron microscopy, and machine learning modelling on both unaltered and altered Mt Simon sandstone. Alteration occurs via incubation in CO2-saturated brine for seven days at 2500 psi and 50 ℃. The size effect law is applied to extract the fracture parameters from the scratch test measurements. A decrease in fracture toughness and an increase in fracture process zone is observed following incubation of Mt Simon sandstone in CO2-saturated brine. Furthermore, microstructural changes are observed such as an increase in the overall porosity, an increase in pore throat sizes, and the formation of local porosity gradients. Evidence of K-feldspar dissolution is shown as well. Thus, scratch testing provides a means to quantify the changes in fracture response following potential CO2-induced geochemical reactions, making the method suitable for quality control and safety design in CO2 geological sequestration schemes.

AB - Our research objective is to understand the evolution of the fracture behavior of host rock during CO2 sequestration. We focus our study on the Mt. Simon sandstone as part of the Illinois Basin Decatur Project, Illinois, USA. We conduct microscopic scratch tests, ion chromatography tests, environmental back-scattered secondary electron microscopy, and machine learning modelling on both unaltered and altered Mt Simon sandstone. Alteration occurs via incubation in CO2-saturated brine for seven days at 2500 psi and 50 ℃. The size effect law is applied to extract the fracture parameters from the scratch test measurements. A decrease in fracture toughness and an increase in fracture process zone is observed following incubation of Mt Simon sandstone in CO2-saturated brine. Furthermore, microstructural changes are observed such as an increase in the overall porosity, an increase in pore throat sizes, and the formation of local porosity gradients. Evidence of K-feldspar dissolution is shown as well. Thus, scratch testing provides a means to quantify the changes in fracture response following potential CO2-induced geochemical reactions, making the method suitable for quality control and safety design in CO2 geological sequestration schemes.

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Akono A-T, Tsotsis TT, Werth CJ. Alteration of the Fracture Behavior in Host Rock during CO2 Geological Sequestration. In Pijaudier-Cabot G, Grassl P, La Borderie C, editors, 10th International Conference on Fracture Mechanics of Concrete and Concrete Structures, FraMCoS-X. 2019 https://doi.org/10.21012/FC10.235480