TY - CONF
T1 - Fluid-rock reactions in Mt. Simon sandstone at microscopic length-scale
AU - Kabir, P.
AU - Akono, A. T.
N1 - Funding Information:
This work was supported as part of the Center for Geologic Storage of CO2, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award # DESC0C12504. The authors would like to thank Illinois State Geological Survey for providing the Mt. Simon specimens tested and analyzed in this investigation. The work was carried out in part in the Frederick Seitz Materials Research Laboratory Central Research Facilities, University of Illinois at Urbana-Champaign. This work made use of the EPIC facility of Northwestern University’s NUANCE Center, which has received support from the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS-1542205); the MRSEC program (NSF DMR-1720139) at the Materials Research Center; the International Institute for Nanotechnology (IIN); the Keck Foundation; and the State of Illinois, through the IIN.
Publisher Copyright:
Copyright © 2018 ARMA, American Rock Mechanics Association.
PY - 2018
Y1 - 2018
N2 - The objective of this work is to investigate fluid-rock reactions in Mt. Simon sandstone to shed light on microseismicity during carbon dioxide geological sequestration. We studied the influence of incubation in high relative humidity (85%) on the elasticity, strength and fracture behavior of Mt. Simon sandstone specimens using a combination of scratch tests, nanoindentation tests, along with advanced imaging techniques such as high-resolution scanning electron microscopy and atomic force microscopy (AFM). Scanning electron microscopy reveals a granular microstructure mainly composed of K-feldspar and quartz grains intermixed with micropores. Meanwhile, at the nanoscale, nanoporous clay exist at the interface between grains. In this study, we investigated the water-rock reactions using microscopic scratch testing combined with statistical nanoindentation. The fracture toughness is evaluated using microscopic scratch tests and nonlinear fracture mechanics. On the other hand, statistical indentation is utilized to measure porosity changes in various specimens. A decrease in fracture toughness is observed after just 48 hours of incubation at high relative humidity (85%). AFM reveals an increase in surface roughness consistent with secondary precipitation reactions. Furthermore, scanning electron microscopy reveals the presence of mineral precipitation at grain boundaries. The results presented are important to understand the impact of geochemical reaction on the mechanical properties of the host rock.
AB - The objective of this work is to investigate fluid-rock reactions in Mt. Simon sandstone to shed light on microseismicity during carbon dioxide geological sequestration. We studied the influence of incubation in high relative humidity (85%) on the elasticity, strength and fracture behavior of Mt. Simon sandstone specimens using a combination of scratch tests, nanoindentation tests, along with advanced imaging techniques such as high-resolution scanning electron microscopy and atomic force microscopy (AFM). Scanning electron microscopy reveals a granular microstructure mainly composed of K-feldspar and quartz grains intermixed with micropores. Meanwhile, at the nanoscale, nanoporous clay exist at the interface between grains. In this study, we investigated the water-rock reactions using microscopic scratch testing combined with statistical nanoindentation. The fracture toughness is evaluated using microscopic scratch tests and nonlinear fracture mechanics. On the other hand, statistical indentation is utilized to measure porosity changes in various specimens. A decrease in fracture toughness is observed after just 48 hours of incubation at high relative humidity (85%). AFM reveals an increase in surface roughness consistent with secondary precipitation reactions. Furthermore, scanning electron microscopy reveals the presence of mineral precipitation at grain boundaries. The results presented are important to understand the impact of geochemical reaction on the mechanical properties of the host rock.
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M3 - Paper
AN - SCOPUS:85053480017
T2 - 52nd U.S. Rock Mechanics/Geomechanics Symposium
Y2 - 17 June 2018 through 20 June 2018
ER -