Mineral changes in cement-sandstone matrices induced by biocementation Public Deposited

http://ir.library.oregonstate.edu/concern/articles/t722hb78b

Supplementary data associated with this article can be found,in the online version, at  http://dx.doi.org/10.1016/j.ijggc.2016.03.019

To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. 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/

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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.
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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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