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Related Experiment Videos

[Microbiological processes in a high-temperature oil field].

E P Rozanova1, I A Borzenkov, A L Tarasov

  • 1Institute of Microbiology, Russian Academy of Sciences, pr. 60-Letiya Oktyabrya 7 k. 2, Moscow, 117811 Russia.

Mikrobiologiia
|May 8, 2001
PubMed
Summary

Thermophilic sulfate-reducing bacteria (SRB) capable of oxidizing oil components were discovered in high-temperature oil fields. These thermophilic SRB play a role in deep oil field processes, distinct from cooler, mesophilic microbial activity.

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Area of Science:

  • Microbiology
  • Geochemistry
  • Petroleum Science

Context:

  • High-temperature oil reservoirs, such as the White Tiger field in Vietnam, harbor unique microbial ecosystems.
  • Injected seawater, used for enhanced oil recovery, contains mesophilic microorganisms and supports low-temperature microbial processes.
  • Thermophilic sulfate-reducing bacteria (SRB) were identified in oil, reservoir water, and engineering systems, but not in the injected seawater.

Purpose:

  • To isolate and characterize thermophilic sulfate-reducing bacteria (SRB) from high-temperature oil field environments.
  • To investigate the microbial communities present in oil reservoirs, associated waters, and oil handling systems.
  • To assess the potential role of microbial sulfate reduction in deep oil field processes.

Summary:

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  • Thermophilic SRB oxidizing lactate, butyrate, and n-alkanes (C12-C16) were isolated from a 90°C oil field environment.
  • These thermophiles were found in oil and water samples from reservoirs and engineering systems, contrasting with the mesophilic microbes in injected seawater.
  • Bacterial production rates of hydrogen sulfide and methane were quantified at different temperatures, and sulfur isotope analysis suggests the effectiveness of microbial sulfate reduction in situ.

Impact:

  • Identifies specific thermophilic SRB capable of degrading oil hydrocarbons at extreme temperatures.
  • Highlights the distinct microbial populations in high-temperature oil reservoirs versus cooler, injected environments.
  • Provides evidence for the significant contribution of microbial sulfate reduction to geochemical processes within deep oil fields.