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Subsurface gas hydrate plugs.

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Bibliographic Details
Title: Subsurface gas hydrate plugs.
Authors: Campbell, Benedict L.1,2 benedictlcampbell@icloud.com, Huuse, Mads1
Source: Geology. Jun2026, Vol. 54 Issue 6, p529-533. 5p.
Subject Terms: *Gas hydrates, *Seismic reflection method, *Continental margins, *Methane hydrates
Geographic Terms: Namibia
Abstract: Marine gas hydrates represent a huge hydrocarbon reservoir in deep-water continental margins and a potential major source of positive feedback to a warming climate. Using threedimensional seismic reflection data from the West African hydrate province offshore Namibia, we document seismic amplitude anomalies, 10–32 milliseconds (ms) high and 50–370 m wide, within the gas hydrate stability zone (GHSZ), with up to 33 ms velocity pull-up affecting reflections many hundreds of ms vertically below the anomalies; and circular depressions, 139–559 m in diameter, below the GHSZ. We interpret the anomalies as subsurface gas hydrate "plugs," consisting of millions of cubic meters of massive hydrate accumulations within the GHSZ, and the craters beneath the GHSZ as associated dissociation-collapse structures. This discovery reveals a new type and dynamics of massive methane hydrate formation along continental margins and requires a reevaluation of previous interpretations of columnar seismic image distortions as kilometer-long fluid flow features. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
FullText Text:
  Availability: 0
Header DbId: enr
DbLabel: Energy & Power Source
An: 194189489
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
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  Data: Subsurface gas hydrate plugs.
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  Data: <searchLink fieldCode="AR" term="%22Campbell%2C+Benedict+L%2E%22">Campbell, Benedict L.</searchLink><relatesTo>1,2</relatesTo><i> benedictlcampbell@icloud.com</i><br /><searchLink fieldCode="AR" term="%22Huuse%2C+Mads%22">Huuse, Mads</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Geology%22">Geology</searchLink>. Jun2026, Vol. 54 Issue 6, p529-533. 5p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Gas+hydrates%22">Gas hydrates</searchLink><br />*<searchLink fieldCode="DE" term="%22Seismic+reflection+method%22">Seismic reflection method</searchLink><br />*<searchLink fieldCode="DE" term="%22Continental+margins%22">Continental margins</searchLink><br />*<searchLink fieldCode="DE" term="%22Methane+hydrates%22">Methane hydrates</searchLink>
– Name: SubjectGeographic
  Label: Geographic Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Namibia%22">Namibia</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Marine gas hydrates represent a huge hydrocarbon reservoir in deep-water continental margins and a potential major source of positive feedback to a warming climate. Using threedimensional seismic reflection data from the West African hydrate province offshore Namibia, we document seismic amplitude anomalies, 10–32 milliseconds (ms) high and 50–370 m wide, within the gas hydrate stability zone (GHSZ), with up to 33 ms velocity pull-up affecting reflections many hundreds of ms vertically below the anomalies; and circular depressions, 139–559 m in diameter, below the GHSZ. We interpret the anomalies as subsurface gas hydrate "plugs," consisting of millions of cubic meters of massive hydrate accumulations within the GHSZ, and the craters beneath the GHSZ as associated dissociation-collapse structures. This discovery reveals a new type and dynamics of massive methane hydrate formation along continental margins and requires a reevaluation of previous interpretations of columnar seismic image distortions as kilometer-long fluid flow features. [ABSTRACT FROM AUTHOR]
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=enr&AN=194189489
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1130/G54292.1
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 5
        StartPage: 529
    Subjects:
      – SubjectFull: Gas hydrates
        Type: general
      – SubjectFull: Seismic reflection method
        Type: general
      – SubjectFull: Continental margins
        Type: general
      – SubjectFull: Methane hydrates
        Type: general
      – SubjectFull: Namibia
        Type: general
    Titles:
      – TitleFull: Subsurface gas hydrate plugs.
        Type: main
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      – PersonEntity:
          Name:
            NameFull: Campbell, Benedict L.
      – PersonEntity:
          Name:
            NameFull: Huuse, Mads
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          Dates:
            – D: 01
              M: 06
              Text: Jun2026
              Type: published
              Y: 2026
          Identifiers:
            – Type: issn-print
              Value: 00917613
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            – Type: volume
              Value: 54
            – Type: issue
              Value: 6
          Titles:
            – TitleFull: Geology
              Type: main
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