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Natural gas hydrates in the Rio Grande Cone (Brazil): A new province in the western South Atlantic
PETROBRAS CENPES Ctr Pesquisas & Desenvolvimento, Brazil.
PUCRS Pontificia Univ Catolica Rio Grande Sul, Brazil.ORCID iD: 0000-0003-4796-8177
PETROBRAS E&P EXPLORAT, Brazil.
PETROBRAS CENPES Ctr Pesquisas & Desenvolvimento, Brazil.
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2015 (English)In: Marine and Petroleum Geology, ISSN 0264-8172, E-ISSN 1873-4073, Vol. 67, p. 187-196Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Elsevier, 2015. Vol. 67, p. 187-196
Keywords [en]
Gas hydrate, South Atlantic, Pelotas Basin, Pockmarks
National Category
Earth and Related Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
URN: urn:nbn:se:lnu:diva-75750DOI: 10.1016/j.marpetgeo.2015.05.012ISI: 000366066500013OAI: oai:DiVA.org:lnu-75750DiVA, id: diva2:1217486
Available from: 2018-06-13 Created: 2018-06-13 Last updated: 2019-02-22Bibliographically approved

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Ketzer, João Marcelo

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