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Natural gas hydrate...
Natural gas hydrates in the Rio Grande Cone (Brazil) : A new province in the western South Atlantic
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- Miller, Dennis J. (author)
- PETROBRAS CENPES Ctr Pesquisas & Desenvolvimento, Brazil
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- Ketzer, João Marcelo (author)
- PUCRS Pontificia Univ Catolica Rio Grande Sul, Brazil
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- Viana, Adriano R. (author)
- PETROBRAS E&P EXPLORAT, Brazil
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- Kowsmann, Renato O. (author)
- PETROBRAS CENPES Ctr Pesquisas & Desenvolvimento, Brazil
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- Freire, Antonio Fernando M. (author)
- PETROBRAS E&P EXPLORAT, Brazil
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- Oreiro, Sergio G. (author)
- PETROBRAS E&P EXPLORAT, Brazil
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- Augustin, Adolpho H. (author)
- PUCRS Pontificia Univ Catolica Rio Grande Sul, Brazil
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- Lourega, Rogerio V. (author)
- PUCRS Pontificia Univ Catolica Rio Grande Sul, Brazil
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- Rodrigues, Luiz F. (author)
- PUCRS Pontificia Univ Catolica Rio Grande Sul, Brazil
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- Heemann, Roberto (author)
- PUCRS Pontificia Univ Catolica Rio Grande Sul, Brazil
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- Preissler, Adriane G. (author)
- PUCRS Pontificia Univ Catolica Rio Grande Sul, Brazil
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- Machado, Claudia X. (author)
- PUCRS Pontificia Univ Catolica Rio Grande Sul, Brazil
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- Sbrissa, Gesiane F. (author)
- PUCRS Pontificia Univ Catolica Rio Grande Sul, Brazil
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(creator_code:org_t)
- Elsevier, 2015
- 2015
- English.
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In: Marine and Petroleum Geology. - : Elsevier. - 0264-8172 .- 1873-4073. ; 67, s. 187-196
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- The Rio Grande Cone is a large-scale fanlike feature in the continental slope of the Pelotas Basin, Southern Brazil, where ubiquitous world-class bottom simulating reflectors (BSRs) are readily observed in seismic records. With the purpose of searching for natural gas hydrate deposits in the Cone area, four oceanographic cruises were carried out between May 2011 and July 2013, leading to the discovery of two pockmark fields, active faults and gas hydrates in shallow sediments. Multichannel seismic, multibeam echo sounder, side scan sonar and sub-bottom profiler records were used to map the shallow section and select sites for piston core sampling. Gas hydrates were recovered in several piston cores within muddy sediments collected inside pockmarks displaying high backscatter in the multibeam and side scan sonar data. We present two representative piston cores where numerous levels of gas hydrates occur, along with degassing features, authigenic carbonate and soupy sediments. Gas dissociated from gas hydrate samples is dominantly methane (>99.78%) with minor quantities of ethane. The chemical and isotopic compositions of the gas strongly suggest a biogenic origin for the analyzed samples. These new findings are regarded as strong enough evidence to consider the Rio Grande Cone as a new gas hydrate province. (C) 2015 Elsevier Ltd. All rights reserved.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences (hsv//eng)
Keyword
- Gas hydrate
- South Atlantic
- Pelotas Basin
- Pockmarks
- Miljövetenskap
- Environmental Science
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Miller, Dennis J ...
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Ketzer, João Mar ...
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Viana, Adriano R ...
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Kowsmann, Renato ...
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Freire, Antonio ...
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Oreiro, Sergio G ...
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Augustin, Adolph ...
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Lourega, Rogerio ...
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Rodrigues, Luiz ...
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Heemann, Roberto
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Preissler, Adria ...
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Machado, Claudia ...
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Sbrissa, Gesiane ...
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
- Articles in the publication
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Marine and Petro ...
- By the university
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Linnaeus University