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Related Experiment Videos

Microbial Penetration through Nutrient-Saturated Berea Sandstone.

G E Jenneman1, M J McInerney, R M Knapp

  • 1Department of Botany and Microbiology and School of Petroleum and Geological Engineering, University of Oklahoma, Norman, Oklahoma 73019.

Applied and Environmental Microbiology
|August 1, 1985
PubMed
Summary
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Microbial penetration in Berea sandstone cores depends on rock permeability. Motile bacteria penetrate faster than non-motile strains, with penetration patterns differing based on permeability.

Area of Science:

  • Microbiology
  • Geology
  • Biogeochemistry

Background:

  • Understanding microbial transport in porous media is crucial for subsurface applications.
  • Factors influencing bacterial penetration in geological formations require detailed investigation.

Purpose of the Study:

  • To determine penetration times and rates of a motile Bacillus strain in Berea sandstone cores.
  • To investigate the influence of core permeability on bacterial penetration dynamics.
  • To compare the penetration capabilities of motile versus non-motile bacterial strains.

Main Methods:

  • Experiments were conducted using nutrient-saturated Berea sandstone cores with varying permeabilities.
  • Penetration times and rates of Bacillus strain were measured.
  • Comparison of penetration rates between motile Enterobacter aerogenes and non-motile Klebsiella pneumoniae.

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Main Results:

  • Penetration rate was largely independent of permeability above 100 mD, but decreased significantly below this threshold.
  • Penetration rates fell into two distinct classes based on permeability (<100 mD and >100 mD).
  • Motile bacteria penetrated cores 3-8 times faster than non-motile bacteria, supporting motility as a key factor.

Conclusions:

  • Bacterial penetration in sandstone is strongly influenced by rock permeability.
  • Motility is a significant driver of rapid microbial penetration, though other growth mechanisms may also contribute.
  • Observed penetration patterns suggest distinct mechanisms for high- and low-permeability media.