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Permafrost, Gas Hydrates and Gas Seeps in the Central Part of the Laptev Sea

Authors
  • Bogoyavlensky, V. I.1
  • Kishankov, A. V.1
  • Kazanin, A. G.2
  • 1 Oil and Gas Research Institute, Russian Academy of Sciences, Moscow, Russia , Moscow (Russia)
  • 2 Marine Arctic Geological Expedition (MAGE), Murmansk, Russia , Murmansk (Russia)
Type
Published Article
Journal
Doklady Earth Sciences
Publisher
Pleiades Publishing
Publication Date
Sep 30, 2021
Volume
500
Issue
1
Pages
766–771
Identifiers
DOI: 10.1134/S1028334X2109004X
Source
Springer Nature
Keywords
Disciplines
  • Oceanology
License
Yellow

Abstract

AbstractThe purpose of this work was to analyze the causes of intensive gas emission in the central part of the Laptev Sea. On the basis of a seismic survey of the JSC Marine Arctic Geological Expedition, the wave fields have been studied on 28 profiles with a total length of 5930 km. Zones with refracted waves from the high-velocity horizons, associated with frozen sediments and possible occurrence of gas hydrates, have been revealed. For the first time for the region, a cartographic scheme of change in the refracted wave propagation velocity and physical state of bottom sediments (frozen or thaw) has been created. The absence of permafrost and gas hydrates in the area of active gas emission was proved, and the deep origin of gas and its migration along tectonic faults were grounded.

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