<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>Robert S. Andrews</dc:contributor>
  <dc:contributor>Denise M. Akob</dc:contributor>
  <dc:contributor>Christina A. DeVera</dc:contributor>
  <dc:contributor>Adam C. Mumford</dc:contributor>
  <dc:contributor>John E. McCray</dc:contributor>
  <dc:contributor>Jennifer C. McIntosh</dc:contributor>
  <dc:creator>Jenna L. Shelton</dc:creator>
  <dc:date>2018</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;Injecting CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;into depleted oil reservoirs to extract additional crude oil is a common enhanced oil recovery (CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;-EOR) technique. However, little is known about how&amp;nbsp;&lt;/span&gt;&lt;i&gt;in situ&lt;/i&gt;&lt;span&gt;&amp;nbsp;microbial communities may be impacted by CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;flooding, or if any permanent microbiological changes occur after flooding has ceased. Formation water was collected from an oil field that was flooded for CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;-EOR in the 1980s, including samples from areas affected by or outside of the flood region, to determine the impacts of CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;-EOR on reservoir microbial communities. Archaea, specifically methanogens, were more abundant than bacteria in all samples, while identified bacteria exhibited much greater diversity than the archaea. Microbial communities in CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;-impacted and non-impacted samples did not significantly differ (ANOSIM: Statistic R = -0.2597, significance = 0.769). However, several low abundance bacteria were found to be significantly associated with the CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;-affected group; very few of these species are known to metabolize CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;or are associated with CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;-rich habitats. Although this study had limitations, on a broad scale, either the CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;&amp;nbsp;flood did not impact the microbial community composition of the target formation, or microbial communities in affected wells may have reverted back to pre-injection conditions over the ca. 40 years since the CO&lt;/span&gt;&lt;sub&gt;2&lt;/sub&gt;&lt;span&gt;-EOR.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1093/femsec/fiy153</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Oxford University Press</dc:publisher>
  <dc:title>Microbial community composition of a hydrocarbon reservoir 40 years after a CO2 enhanced oil recovery flood</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>