Geochemical and geomechanical alteration of siliciclastic reservoir rock by supercritical CO2-saturated brine formed during geological carbon sequestration

Fuchs, Samantha J.; Espinoza, D. Nicholas; Lopano, Christina L.; Akono, Ange-Therese; Werth, Charles J.

doi:10.1016/j.ijggc.2019.06.014

Title: Geochemical and geomechanical alteration of siliciclastic reservoir rock by supercritical CO₂-saturated brine formed during geological carbon sequestration

Journal Article · Wed Jun 26 00:00:00 EDT 2019 · International Journal of Greenhouse Gas Control

DOI:https://doi.org/10.1016/j.ijggc.2019.06.014· OSTI ID:1582318

Fuchs, Samantha J. ^[1]; Espinoza, D. Nicholas ^[1]; Lopano, Christina L. ^[2]; Akono, Ange-Therese ^[3]; Werth, Charles J. ^[1]

Univ. of Texas, Austin, TX (United States)
National Energy Technology Lab. (NETL), Pittsburgh, PA (United States)
Northwestern Univ., Evanston, IL (United States)

Geologic carbon sequestration (GCS) is a method for storing CO₂ and mitigating greenhouse gas emissions. During GCS, carbon dioxide dissolves into pore water, resulting in a low-pH brine that can react with reservoir rock minerals. This work evaluates the effects of geochemical reactions on geomechanical integrity of representative siliciclastic reservoir samples obtained from the Mt. Simon formation. Rock samples were aged 4 or 8 weeks in CO₂-saturated brine under reservoir conditions, and in N₂-saturated brine as a control. Post-aging, CT scans revealed more extensive micro-fracture development along horizontal bedding planes at grain edges in CO₂ versus N₂-aged samples. Digital analysis of CO₂-aged samples showed porosity increase from 8.1% to 15.8%. Scanning electron microscopy unearthed the loss of clay cementation, greater exposure of quartz and K-feldspar grains, and apparent surface roughening (confirmed by laser profilometry) in CO₂-aged samples, but not in N₂-aged samples. Fracture toughness as evaluated by scratch testing was reduced by 32.1% after 4 weeks in scCO₂-saturated brine and 69.5% after 8 weeks. The main reason for weakening appears to be detachment of clays from quartz and feldspar grain surfaces, resulting in weakening of the rock matrix. Rock weakening may alter the geomechanical stability of storage formations.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for Geologic Storage of CO2 (GSCO2); National Energy Technology Laboratory (NETL), Pittsburgh, PA, Morgantown, WV, and Albany, OR (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0C12504; FC26-05NT42588

OSTI ID:: 1582318

Alternate ID(s):: OSTI ID: 1780179

Journal Information:: International Journal of Greenhouse Gas Control, Vol. 88, Issue C; ISSN 1750-5836

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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58 GEOSCIENCES
Geologic carbon sequestration
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Geomechanics
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Title: Geochemical and geomechanical alteration of siliciclastic reservoir rock by supercritical CO2-saturated brine formed during geological carbon sequestration

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References (37)

Figures / Tables (8)

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Title: Geochemical and geomechanical alteration of siliciclastic reservoir rock by supercritical CO₂-saturated brine formed during geological carbon sequestration