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Manifestations of deep degasing into the water column and upper part of the Pechora sea sedimentary section

S.Yu. Sokolov, E.A. Moroz, E.A. Sukhikh, A.A. Razumovskiy, O.V. Levchenko

Original article

DOI https://doi.org/10.18599/grs.2019.4.68-76

68-76
rus.

open access

Under a Creative Commons license

Studies of acoustic anomalies in the water column and seismoacoustic anomalies in the Quaternary sediments of Pechora sea and their relationship with deep hydrocarbon sources were conducted by the Institute of Oceanology of the Russian Academy of Sciences and the Geological Institute of the Russian Academy of Sciences in the 38th cruise of RV “Academik Nikolaj Strakhov” in 2018. Mapping of free gas manifestations presents an additional indicator of tectonic activity and the fault network frame, which provides the flow of fluids from deep horizons. Comparison of high-resolution seismic survey data with deep seismic survey data shows that the fluid in the upper part of the section is first accumulated under the bottom of Jurassic-Cretaceous sedimentary sequences, which are fluid-resistant. Local dislocations of fluid trap lead to further rise and redistribution of free gas in Quaternary sequences. Natural or artificial break of their integrity results in the release of gas into the water column from near-surface accumulations that were found in the form of “bright spot” anomalies on seismic-acoustic records. Mapping of sound scattering objects in the water column shows the degassing areas, which are usually located above the deep faults. “Bright spots” of free gas in the Quaternary sequences have a variety of shapes – multi-tiered and inclined. Gas breaks into the water column occur near the edges of these anomalies. Systematic mapping of the considered phenomena is a necessary element in the preparation of the area for industrial operation.

 

sound scattering objects, seismic acoustic, faults, degassing, bright spot

 

  • Bogoyavlensky V. I. (2015). Emissions of gas and oil on land and waters of the Arctic and the oceans. Burenie i neft [Drilling and Oil], 6, pp. 4-10. (In Russ.)
  • Bondarev V. N., Rokos S. I., Kostin D. A., Dlugach A. G., Polyakova N. (2002). Frozen gas accumulations in the upper part of the sedimentary cover of the Pechora sea. Russian Geology and Geophysics, 43(7), pp. 587-598. (In Russ.)
  • Dunaev N. N., Levchenko O. V., Merklin L. R., Pavlidis, Y. A. (1995). Prinovozemelsky shelf in late Quaternary time. Oceanology, 35(3), pp. 440-450. (In Russ.)
  • Kazanin G. S., Pavlov S. P., Shlykov V. V., Stoupakova A. V., Norina D. A. Sautkin, R. S., Suslov A. A. (2011). Seismic-geological structure of the Pechora and South-Eastern part of the Barents seas based on the interpretation of the frame network of seismic profiles of the CDP 2D. Geology and Geoecology of the continental margins of Eurasia. Мoscow: GEOS, vol. 3, pp. 59-81. (In Russ.)
  • Kostin D. A., Tarasov G. A. (2011). Quaternary sedimentary cover of the Barents-Kara basin. Geology and Geoecology of the continental margins of Eurasia. Мoscow: GEOS, vol. 3, pp. 107-130. (In Russ.)
  • Krapivner R. B. (2018). The crisis of the glacial theory: arguments and facts. Мoscow: GEOS, 320 p. (In Russ.)
  • Levchenko O. V., Merklin L. R. (2003). Seismic stratigraphy. Pechora sea. System research. Мoscow: MORE, pp. 321-354. (In Russ.)
  • Rokos S. I., Kostin D. A., Dlugach A. G. (2001). Free gas and permafrost in the sediments of the upper section of the shallow shelf areas of the Pechora and Kara seas. Sedimentological processes and evolution of marine ecosystems in conditions of marine periglacial. Appatity: KNC RAS, pp. 40-51. (In Russ.)
  • Shipilov E.V., Shkarubo S.I. (2010). Modern problems of Geology and tectonics of sedimentary basins of the Eurasian-Arctic continental margin. V. 1. Lithological and seismostratigraphic sequences of sedimentary basins of the Barents-Kara shelf. Appatity: KNC RAS, 266 p. (In Russ.)
  • Sobornov K. O. (2018). Early Mesozoic deformations of Northern Eurasia: geodynamics and oil and gas potential. Proceedings of the International geological and geophysical conference “GeoEurasia 2018. Modern methods of study and exploration of Eurasia”. Тver: Polipress, pp. 76-80. (In Russ.)
  • Sokolov S. Yu., Moroz E. A., Abramova A. S., Zaraiskaya Yu. A., Dobrolyubova K. O. (2017). Mapping of sound scattering objects in the Northern part of the Barents sea and their geological interpretation. Oceanology, 57(4), pp. 655-662. (In Russ.) https://doi.org/10.1134/S000143701704018X
  • Solheim A., Musatov E., Heintz N. (1998). Geological aspects of Franz Josef Land and the northernmost Barentz Sea. Meddelelser, no. 151. Oslo: Norsk Polarinstitutt, 120 p.
  • State geological map of the Russian Federation. Series North-Kara-Barents Sea. (2013). Scale 1:1,000,000 (third generation). Sheets R-39,40. Kolguev Island – Prol. the Karsky Vorota. St.Petersburg: Cartfabrika VSEGEI, 477 p. (In Russ.)
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Sergey Yu. Sokolov
Geological Institute of the Russian Academy of Sciences
7, Pyzhevsky lane, Moscow, 119017, Russian Federation
E-mail: sysokolov@yandex.ru

Evgeniy A. Moroz
Geological Institute of the Russian Academy of Sciences
7, Pyzhevsky lane, Moscow, 119017, Russian Federation

Elena A. Sukhikh
Geological Institute of the Russian Academy of Sciences
7, Pyzhevsky lane, Moscow, 119017, Russian Federation

Anatoliy A. Razumovskiy
Geological Institute of the Russian Academy of Sciences
7, Pyzhevsky lane, Moscow, 119017, Russian Federation

Oleg V. Levchenko
Institute of Oceanology of the Russian Academy of Sciences
36, Nakhimovsky ave., Moscow, 117997, Russian Federation

 

For citation:

Sokolov S.Yu., Moroz E.A., Sukhikh E.A., Razumovskiy A.A., Levchenko O.V. (2019). Manifestations of deep degasing into the water column and upper part of the Pechora sea sedimentary section. Georesursy = Georesources, 21(4), pp. 68-76. DOI: https://doi.org/10.18599/grs.2019.4.68-76