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Electromagnetic, magnetotelluric soundings, transient electromagnetic sounding, permafrost, cryolithozone, gas hydrates, Yenisei-Khatanga trough, Anabar-Lena trough

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«Earth`s Cryosphere», 2018, Vol. XXII, № 5, p. 67-84

Permafrost study in the northern margin of the
Siberian platform based on regional geoelectric survey data

D.V. Yakovlev1, A.G. Yakovlev1,2, O.A. Valyasina2

1 Nord-West Ltd., korpus A, Business centre “Rumyancevo”, pos. Moskovskiy, Moscow, 108811, Russia; nw.yakovlev@gmail.com
2 Lomonosov Moscow State University, Faculty of Geology, 1, Leninskie Gory, Moscow, 119991, Russia

The paper presents results of the permafrost study in the northern margin of the Siberian Platform, obtained during regional geoelectrical surveys by magnetotelluric and transient electromagnetic methods. The surveys aimed to identify areas perspective for oil and gas within the entire sedimentary cover. In the period from 2005 to 2016, more than 30,000 soundings were performed with a total survey line length of more than 20,000 km. A large amount of factual data acquired in the Yenisei-Khatanga and the Anabar-Lena regional troughs allowed mapping the permafrost base depth and provided insights about other structural features of the permafrost interval, along with the information on permafrost distribution beneath the Khatanga Bay. High-resistivity anomalies identified above the hydrocarbon-bearing reservoirs capped by the permafrost strata are likely to be associated with accumulations of gas-hydrates.

Electromagnetic, magnetotelluric soundings, transient electromagnetic sounding, permafrost, cryolithozone, gas hydrates, Yenisei-Khatanga trough, Anabar-Lena trough

DOI: 10.21782/EC2541-9994-2018-5(67-84)

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