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Relief of degassing areas in the eastern part of the Pechora Seaстатья
- Авторы: Denisova Anna, Moroz Evgeny, Sukhikh Elena, Zarayskaya Yulia
- Сборник: Proceedings of the 26th International Conference on Port and Ocean Engineering under Arctic Conditions, POAC
- Год издания: 2021
- Аннотация: Geological and geophysical studies of the bottom relief and the structure of the sedimentary cover of the Pechora Sea were carried out on the Akademik Nikolay Strakhov research vessel during the 38th and 41st expeditions (2018-2019). А detailed digital terrain model was created In the course of processing the data obtained by multipath sonar. The forms of relict permafrost relief were identified on this model by morphology (including specific polygonal structures). Seismoacoustic studies of the water area revealed marks of degassing in the structure of the sedimentary cover and the water column. Activation of the degassing process may be a result of the degradation of relict permafrost, which are fluid-resistant. In addition, gas emissions (the formation of gas flares) can be caused by the destabilization of gas hydrates in the process of thawing permafrost. Degassing can be hazardous for the construction and operation of oil and gas infrastructure objects (pipelines, drilling platforms, etc.), as well as for underwater vehicles and vessels. Gas emissions lead to decompaction of the loose bottom sediments, changes in their physical and mechanical properties (decline of bearing capacity, strength characteristics, etc.) Deformations of structures located on the bottom are possible as a result of these changes. The Pechora Sea is strategic importance region due to it’s significant hydrocarbon reserves and transportation routes. It is important to study in detail the anomalies that arise as a result of degassing and the resulting landforms for the successful development of this region. It is necessary to forecast the further dynamics of these phenomena in the context of climate changes recorded in the Arctic region in recent decades
- Добавил в систему: Денисова Анна Павловна