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Home » Archive of journals » Volume 13, No. 4, 2023 » Distribution of subsea permafrost (frozen ground) in the Laptev Sea based on seismic refraction data


JOURNAL: Volume 13, No. 4, 2023, p. 501-515

HEADING: Research activities in the Arctic

AUTHORS: Bogoyavlensky, V.I., Kishankov, A.V., Kazanin, A.G.

ORGANIZATIONS: Oil and Gas Research Institute of RAS, JSC Marine Arctic Geological Expedition

DOI: 10.25283/2223-4594-2023-4-501-515

UDC: 553.981.2

The article was received on: 28.08.2023

Keywords: gas hydrates, Laptev sea, seismic prospecting, gas seeps, permafrost, taliks, refraction waves, upper part of the section (UPS)

Bibliographic description: Bogoyavlensky, V.I., Kishankov, A.V., Kazanin, A.G. Distribution of subsea permafrost (frozen ground) in the Laptev Sea based on seismic refraction data. Arktika: ekologiya i ekonomika. [Arctic: Ecology and Economy], 2023, vol. 13, no. 4, pp. 501-515. DOI: 10.25283/2223-4594-2023-4-501-515. (In Russian).


For the first time, for an area of 454 thousand km2 of the Laptev Sea, processing and comprehensive analysis of a large volume of records of the first arrivals of refracted waves of common shot gathers was carried out along 113 CDP seismic lines of JSC MAGE with a total length of about 20.7 thousand km. Fundamentally new information was obtained on the state of the subsea cryolithozone, and the boundary between the predominant distribution of frozen (Southern zone) and thawed (Northern zone) ground was identified. It was substantiated that a number of identified through taliks in the Southern zone have an endogenous genesis and are associated with large disjunctive displacements. High seismic activity in the central part of the Laptev Sea improves faults permeability, which contributes to the activation of subvertical migration of deep fluid flows and enhances the role of the endogenous factor in the degradation of permafrost (frozen ground) and gas hydrates. A large thawed zone was discovered in the North Western area of JSC MAGE activities, approaching close to the coast of Taimyr. A comparison of the results obtained with the data of the stratigraphic well DL-1, drilled in 2022 by FSBI VSEGEI and JSC Rosgeologia near the eastern border of the Laptev Sea, showed their complete correspondence, clearly indicating completed degradation of subsea permafrost in a significant part of the seas of Eastern Siberia.

Finance info: The research was carried out according to the state assignment of the Oil and Gas Research Institute, Russian Academy of Sciences on the topic “Improving the efficiency and environmental safety of the oil and gas resources development in the Arctic and Subarctic zones of the Earth in a changing climate” (No. 122022800264-9).


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DOI 10.25283/2223-4594