A Gas-Emission Crater in the Erkuta River Valley, Yamal Peninsula: Characteristics and Potential Formation Model
Evgeny Chuvilin,
Julia Stanilovskaya,
Aleksey Titovsky,
Anton Sinitsky,
Natalia Sokolova,
Boris Bukhanov,
Mikhail Spasennykh,
Alexey Cheremisin,
Sergey Grebenkin,
Dinara Davletshina,
Christian Badetz
Affiliations
Evgeny Chuvilin
Center for Hydrocarbon Recovery, Skolkovo Institute of Science and Technology (Skoltech), Skolkovo Innovation Center, 3 Nobel Street, Moscow 121205, Russia
Julia Stanilovskaya
Total, 2 Jean Miller, La Defense, 92078 Paris, France
Aleksey Titovsky
Department of Science and Innovation of the Yamal-Nenets Autonomous District (YNAO), Salekhard 629008, Russia
Anton Sinitsky
Arctic Research Center of the Yamal-Nenets Autonomous District, Salekhard 629008, Russia
Natalia Sokolova
Center for Hydrocarbon Recovery, Skolkovo Institute of Science and Technology (Skoltech), Skolkovo Innovation Center, 3 Nobel Street, Moscow 121205, Russia
Boris Bukhanov
Center for Hydrocarbon Recovery, Skolkovo Institute of Science and Technology (Skoltech), Skolkovo Innovation Center, 3 Nobel Street, Moscow 121205, Russia
Mikhail Spasennykh
Center for Hydrocarbon Recovery, Skolkovo Institute of Science and Technology (Skoltech), Skolkovo Innovation Center, 3 Nobel Street, Moscow 121205, Russia
Alexey Cheremisin
Center for Hydrocarbon Recovery, Skolkovo Institute of Science and Technology (Skoltech), Skolkovo Innovation Center, 3 Nobel Street, Moscow 121205, Russia
Sergey Grebenkin
Center for Hydrocarbon Recovery, Skolkovo Institute of Science and Technology (Skoltech), Skolkovo Innovation Center, 3 Nobel Street, Moscow 121205, Russia
Dinara Davletshina
Center for Hydrocarbon Recovery, Skolkovo Institute of Science and Technology (Skoltech), Skolkovo Innovation Center, 3 Nobel Street, Moscow 121205, Russia
Christian Badetz
Total, 2 Jean Miller, La Defense, 92078 Paris, France
Methane is a powerful greenhouse gas, and the abrupt degassing events that recently have formed large craters on the Russian Arctic Yamal and Gydan Peninsulas have caused major concern. Here we present field data on cover sediments and evolution of a gas-emission crater discovered in the Erkuta–Yakha River valley in the southern Yamal Peninsula in June 2017. The crater is located south of other similar craters discovered over the past decade in northern West Siberia. Data were collected during a field trip to the Erkuta crater in December 2017 which included field observations and sampling of permafrost soil and ground ice from the rim of the crater. All soil and ice samples were measured for contents of methane and its homologs (ethane and propane) and carbon dioxide. The contents of carbon dioxide in some samples are notably higher than methane. The strongly negative δ13С of methane from ground ice samples (−72‰) is typical of biogenic hydrocarbons. The ratio of methane to the total amount of its homologs indicate a component of gases that have migrated from a deeper, thermogenic source. Based on obtained results, a potential formation model for Erkuta gas-emission crater is proposed, which considers the combined effect of deep-seated (deep gas migration) and shallow (oxbow lake evolution and closed talik freezing) causes. This model includes several stages from geological prerequisites to the lake formation.
