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Cultivation and biogeochemical analyses reveal insights into biomineralization caused by piezotolerant iron-reducing bacteria from petroleum reservoirs and their application in MEOR. | LitMetric

Cultivation and biogeochemical analyses reveal insights into biomineralization caused by piezotolerant iron-reducing bacteria from petroleum reservoirs and their application in MEOR.

Sci Total Environ

The Key Laboratory of Marine Reservoir Evolution and Hydrocarbon Accumulation Mechanism, Ministry of Education, College of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China. Electronic address:

Published: December 2023

AI Article Synopsis

  • Interactions between iron-reducing bacteria and minerals under pressure are crucial for oil extraction and CO storage, but the effects of pressure on these bacteria are not well understood.
  • Experiments under varying hydrostatic pressures (0.1-40 MPa) revealed that higher pressures increase microbial diversity in oil reservoirs, which can help in restoring underground ecosystems.
  • Key bacteria identified were Shewanella and Flaviflexus, which were found to be piezophiles, and their activity led to changes in mineral surfaces and the formation of new minerals, aiding in preventing reservoir damage.

Article Abstract

Interactions between minerals and iron-reducing bacteria under in-situ pressure and temperature conditions play important roles in oil extraction, residual oil methanation, and CO storage in petroleum reservoirs. However, the impacts of pressure on dissimilatory iron-reducing bacteria (DIRB) are poorly understood. Herein, the interactions between clay minerals and microbes under elevated hydrostatic pressure conditions were elucidated through enrichment experiments. Bioreduction experiments were performed under hydrostatic pressures of 0.1-40 MPa. Microbial diversity analysis revealed that high pressures significantly increased microbial diversity in petroleum reservoirs, which is helpful for restoring underground ecosystems in situ. The key piezotolerant iron-reducing bacteria in the samples were Shewanella and Flaviflexus. These two genera were isolated for the first time from petroleum reservoirs and identified as piezophiles. The SEM results clearly showed mineral surface dissolution. Moreover, nanoscale secondary minerals were produced during biomineralization. XRD analysis revealed that illite, albite, and clinoptilolite were present after bioreduction. The isolates showed the capacity to inhibit hydro-swelling and prevent plugging-related damage in reservoirs.

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Source
http://dx.doi.org/10.1016/j.scitotenv.2023.166465DOI Listing

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