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Mineral changes in cement-sandstone matrices induced by biocementation

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  • Prevention of wellbore CO₂ 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 CaCO₃. 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 CO₂ (PCO₂) conditions. The bacterium grew optimum at 30 °C compared to 40 °C under ambient and high pressure (10 MPa) conditions; and growth was comparable in experiments at high PCO₂. Sporosarcina pasteurii actively induced the biomineralization of CaCO₃ polymorphs and MgCa(CO₃)₂ in both ambient and high pressure conditions as observed in electron microscopy. In contrast, abiotic (non-biological) samples exposed to CO₂ 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.
  • This is the publisher’s final pdf. The article is published by Elsevier and can be found at: http://www.journals.elsevier.com/international-journal-of-greenhouse-gas-control/
  • Keywords: Supercritical CO₂, Biofilm, Biomineralization, Bioprecipitation, Carbon sequestration, Sporosarcina pasteurii
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  • Verba, C., Thurber, A. R., Alleau, Y., Koley, D., Colwell, F., & Torres, M. E. (2016). Mineral changes in cement-sandstone matrices induced by biocementation. International Journal of Greenhouse Gas Control, 49, 312-322. doi:10.1016/j.ijggc.2016.03.019
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  • 49
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