Characterization of bacterial communities in high-temperature heavy oil reservoir

Lujun Chai, Yuehui She, Ibrahim M. Banat, Xianqing Li

Research output: Contribution to journalArticlepeer-review

Abstract

Many studies have focused on the microbial community of 20 °C~60 °C temperature heavy oil reservoirs. However, bacterial communities in (>80 °C) high-temperature heavy oil reservoir have not been studied. To investigate characterization of bacterial communities in a 86 °C high-temperature heavy oil reservoir in Shandong, China, bacterial communities of three production wells were investigated using the 16S rDNA clone library and 16S rDNA sequencing technology. A total of 539 sequences are drawn and assigned to 77 operational taxonomic units, which are classified as 20 genus species. The oil reservoir harbours many groups of bacteria. The stains of Thermanaeromonas are the predominant bacteria in D116 (38%) and D10 (27%) clone libraries, with the dominant bacteria of Thermacetogenium in D18 (33%) clone library, and the other thermophilic genera are closely related to Thermanaeromonas, Thermacetogenium, Petrobacter, and Bacillus, while halotolerant strains of Halanaerobium, Halomonas, Marinobacter, Martelella, Thalassospira, and Pelagibacterium are identified, which are consistent with the temperature and salinity of the oil reservoir. Pseudomonas, Marinobacter, Bacillus, Thermanaeromonas, Petrobacter, and Thermacetogenium, Thalassospira, have the potential to grow using heavy oil as carbon sources. The groups of Pelagibacterium and Halanaerobium produce byproducts (solvents, acids, and gases) to reduce viscosity of heavy oil. The results could provide basic theoretical guidance for additional oil recovery from heavy oil fields.

Original languageEnglish
Article number201706651
JournalJournal of Engineering Science and Technology Review
Volume11
Issue number2
DOIs
Publication statusPublished - 1 Apr 2018

Keywords

  • 16S rDNA clone library
  • Bacterial community
  • Heavy oil
  • High temperature

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