Mineral changes in cement-sandstone matrices induced by biocementation

Prevention of wellbore CO sub(2) leakage is a critical component of any successful carbon capture, utilization, and storage program. Sporosarcina pasteurii is a bacterium that has demonstrated the potential ability to seal a compromised wellbore through the enzymatic precipitation of CaCO sub(3). He...

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Bibliographic Details
Published in:International journal of greenhouse gas control 2016-06, Vol.49, p.312-322
Main Authors: Verba, C., Thurber, A.R., Alleau, Y., Koley, D., Colwell, F., Torres, M.E.
Format: Article
Language:English
Subjects:
BASIC BIOLOGICAL SCIENCES
Biofilm
Biomineralization
Bioprecipitation
Carbon sequestration
GEOSCIENCES
Sporosarcina pasteurii
Supercritical CO2
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Summary:Prevention of wellbore CO sub(2) leakage is a critical component of any successful carbon capture, utilization, and storage program. Sporosarcina pasteurii is a bacterium that has demonstrated the potential ability to seal a compromised wellbore through the enzymatic precipitation of CaCO sub(3). Here we investigate the growth of S. pasteurii in a synthetic brine that mimics the Illinois Basin and on Mt. Simon sandstone encased in Class H Portland cement under high pressure and supercritical CO sub(2) (P sub(CO2)) conditions. The bacterium grew optimum at 30 degree C compared to 40 degree C under ambient and high pressure (10 MPa) conditions; and growth was comparable in experiments at high P sub(CO2). Sporosarcina pasteurii actively induced the biomineralization of CaCO sub(3) polymorphs and MgCa(CO sub(3)) sub(2) in both ambient and high pressure conditions as observed in electron microscopy. In contrast, abiotic (non-biological) samples exposed to CO sub(2) resulted in the formation of surficial vaterite and calcite. The ability of S. pasteurii to grow under subsurface conditions may be a promising mechanism to enhance wellbore integrity.
ISSN:1750-5836
1878-0148
DOI:10.1016/j.ijggc.2016.03.019