Natural gas and gas hydrate accumulations within permafrost in Russia

Yakushev, V.S.; Chuvilin, Evgeny

doi:10.1016/s0165-232x(00)00012-4

Cited by 102 publications

(117 citation statements)

References 2 publications

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“…Freezing of marine deposits is a classical case of the forming of epigenetic permafrost. Biogenic methane disclosed by the borehole in these sediments tended to accumulate in the sandy layers, obviously having high permeability, and serving as the lithological trap during permafrost development [16,19]. We assume these accumulations are similar to our finding in the borehole 3,4-07.…”

Section: Evidence Of Cryogenic Transport Of Methanesupporting

confidence: 74%

“…In Yamal [19], the section was composed of Pleistocene marine silts with no observable ice inclusions. Within the interval of 29-130 m, the sand bands occurred in the silts.…”

Section: Experimental Findingsmentioning

confidence: 99%

“…The occurrence of the pockets could be tracked by methane blowouts during drilling documented widely in the permafrost zone from Yamal to Chukotka [19] deeper than 28 m in disperse Quaternary sediments. We believe that deep sea or lake waters or modern exogenic processes form weakened thaw zones in permafrost that provide channels for such methane accumulations, entrapped in permafrost to escape.…”

Section: Implications For Methane Exchange Between Permafrost and Atmmentioning

confidence: 99%

“…Measurements of the gas flow from different intervals were undertaken at mouths of multiple boreholes. Blowout gas composition and isotopic composition of methane as a component of this gas were studied [16,19] in the samples taken from the borehole mouth at the time of gas release. The corrections for methane concentration in the air were made.…”

Section: Introductionmentioning

confidence: 99%

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Cryogenic Displacement and Accumulation of Biogenic Methane in Frozen Soils

et al. 2017

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Evidences of highly localized methane fluxes are reported from the Arctic shelf, hot spots of methane emissions in thermokarst lakes, and are believed to evolve to features like Yamal crater on land. The origin of large methane outbursts is problematic. Here we show, that the biogenic methane (δ 13 C ≤ −71 ) which formed before and during soil freezing is presently held in the permafrost. Field and experimental observations show that methane tends to accumulate at the permafrost table or in the coarse-grained lithological pockets surrounded by the sediments less-permeable for gas. Our field observations, radiocarbon dating, laboratory tests and theory all suggest that depending on the soil structure and freezing dynamics, this methane may have been displaced downwards tens of meters during freezing and has accumulated in the lithological pockets. The initial flux of methane from the one pocket disclosed by drilling was at a rate of more than 2.5 kg C(CH 4 ) m −2 h −1 . The age of the methane was 8-18 thousand years younger than the age of the sediments, suggesting that it was displaced tens of meters during freezing. The theoretical background provided the insight on the cryogenic displacement of methane in support of the field and experimental data. Upon freezing of sediments, methane follows water migration and either dissipates in the freezing soils or concentrates at certain places controlled by the freezing rate, initial methane distribution and soil structure.

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Section: Evidence Of Cryogenic Transport Of Methanesupporting

confidence: 74%

“…In Yamal [19], the section was composed of Pleistocene marine silts with no observable ice inclusions. Within the interval of 29-130 m, the sand bands occurred in the silts.…”

Section: Experimental Findingsmentioning

confidence: 99%

Section: Implications For Methane Exchange Between Permafrost and Atmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cryogenic Displacement and Accumulation of Biogenic Methane in Frozen Soils

et al. 2017

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“…Известно, что высокое удельное газосодержание гидрата является следствием их высокой плотности и малой пористости [18]. Видно, что нативная мор-фология искусственно полученных газовых гидратов Таблица 2 Экспериментальные данные по искусственному получению газовых гидратов с использованием металлической конструкции пред-ставлена плотными непрозрачными гранулированны-ми формами гидратов (рис.3а).…”

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Studying of features of processes of formation and mechano-chemical processing synthetic hydrates of natural ga

Semyonov¹,

Kalacheva²,

Shits³

2014

SOCAR Proceedings

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Methane oxidation following submarine permafrost degradation: Measurements from a central Laptev Sea shelf borehole

Overduin

Liebner

Knoblauch

et al. 2015

J. Geophys. Res. Biogeosci.

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Submarine permafrost degradation has been invoked as a cause for recent observations of methane emissions from the seabed to the water column and atmosphere of the East Siberian shelf. Sediment drilled 52 m down from the sea ice in Buor Khaya Bay, central Laptev Sea revealed unfrozen sediment overlying ice-bonded permafrost. Methane concentrations in the overlying unfrozen sediment were low (mean 20 μM) but higher in the underlying ice-bonded submarine permafrost (mean 380 μM). In contrast, sulfate concentrations were substantially higher in the unfrozen sediment (mean 2.5 mM) than in the underlying submarine permafrost (mean 0.1 mM). Using deduced permafrost degradation rates, we calculate potential mean methane efflux from degrading permafrost of 120 mg m À2 yr À1 at this site.However, a drop of methane concentrations from 190 μM to 19 μM and a concomitant increase of methane δ 13 C from À63‰ to À35‰ directly above the ice-bonded permafrost suggest that methane is effectively oxidized within the overlying unfrozen sediment before it reaches the water column. High rates of methane ebullition into the water column observed elsewhere are thus unlikely to have ice-bonded permafrost as their source.

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Natural gas and gas hydrate accumulations within permafrost in Russia

Cited by 102 publications

References 2 publications

Cryogenic Displacement and Accumulation of Biogenic Methane in Frozen Soils

Cryogenic Displacement and Accumulation of Biogenic Methane in Frozen Soils

Studying of features of processes of formation and mechano-chemical processing synthetic hydrates of natural ga

Methane oxidation following submarine permafrost degradation: Measurements from a central Laptev Sea shelf borehole

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