A Quick-Look Method for Initial Evaluation of Gas Hydrate Stability below Subaqueous Permafrost

Tinivella, Umberta; Giustiniani, Michela; Marín-Moreno,

doi:10.3390/geosciences9080329

Cited by 9 publications

(6 citation statements)

References 53 publications

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“…Generally, hydrates accumulate anywhere in the ocean-bottom sediments where water depth exceeds about 400 m (Figure 1). In Polar Regions, in presence of sub-seawater permafrost, the hydrate could be stable at shallower water as demonstrated recently by [2,3]. Very deep (abyssal) sediments are generally not thought to house hydrates in large quantities due to the lack of high biologic productivity (necessary to produce the organic matter that is converted to methane) and rapid sedimentation rates (necessary to bury the organic matter), both necessary for hydrate formation on the continental shelves.…”

Section: Introductionmentioning

confidence: 94%

Gas Hydrates in Antarctica

Giustiniani¹,

Tinivella²

2021

Glaciers and the Polar Environment

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Few potential distributing areas of gas hydrates have been recognized in literature in Antarctica: the South Shetland continental margin, the Weddell Sea, the Ross Sea continental margin and the Wilkes Land continental margin. The most studied part of Antarctica from gas hydrate point of view is the South Shetland margin, where an important gas hydrate reservoir was well studied with the main purpose to determine the relationship between hydrate stability and environment effects, including climate change. In fact, the climate signals are particularly amplified in transition zones such as the peri-Antarctic regions, suggesting that the monitoring of hydrate system is desirable in order to detect potential hydrate dissociation as predicted by recent modeling offshore Antarctic Peninsula. The main seismic indicator of the gas hydrate presence, the bottom simulating reflector, was recorded in few parts of Antarctica, but in some cases it was associated to opal A/CT transition. The other areas need further studies and measurements in order to confirm or refuse the gas hydrate presence.

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Section: Introductionmentioning

confidence: 94%

Gas Hydrates in Antarctica

Giustiniani¹,

Tinivella²

2021

Glaciers and the Polar Environment

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“…The state of the GHSZ within the permafrost area strongly depends on the ground temperature and pressure, that is why the calculations were conducted with the phase curves of methane hydrate under the corresponding lithostatic pressure. In accordance with [43], the pressure in the ground layer was calculated as the hydrostatic column pressure beneath the frozen layer at the study depth and as the lithostatic pressure at the bottom of permafrost. Figure 3.…”

Section: Description Of the Numerical Modelmentioning

confidence: 99%

“…The calculations of the thermal state of bottom sediments are accompan thermal dynamic boundaries of the methane gas hydrates stability zone (Fig the GHSZ within the permafrost area strongly depends on the ground tem that is why the calculations were conducted with the phase curves of meth corresponding lithostatic pressure. In accordance with [43], the pressure in calculated as the hydrostatic column pressure beneath the frozen layer at the lithostatic pressure at the bottom of permafrost.…”

Section: Description Of the Numerical Modelmentioning

confidence: 99%

Permafrost and Gas Hydrate Stability Zone of the Glacial Part of the East-Siberian Shelf

et al. 2020

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By using thermal mathematical modeling for the time range of 200–0 thousand years ago, the authors have been studying the role the glaciation, covered the De Long Islands and partly the Anjou Islands at the end of Middle Neopleistocene, played in the formation of permafrost and gas hydrates stability zone. For the modeling purpose, we used actual geological borehole cross-sections from the New Siberia Island. The modeling was conducted at geothermal flux densities of 50, 60, and 75 mW/m2 for glacial and extraglacial conditions. Based on the modeling results, the glaciated area is characterized by permafrost thickness of 150–200 m lower than under extraglacial conditions. The lower boundary of the gas hydrate stability zone in the glacial area at 50–60 mW/m2 is located 300 m higher than the same under extraglacial conditions. At 75 mW/m2 in the area of 20–40 m isobaths, open taliks are formed, and the gas hydrate stability zone was destroyed in the middle of the Holocene. The specified conditions and events were being formed in the course of the historical development of the glacial area with a predominance of the marine conditions peculiar to it from the middle of the Middle Neopleistocene.

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“…Many studies have demonstrated the coexistence of subaqueous permafrost, gas hydrate and the effect of the subaqueous on their formation/dissociation, i.e., [37]. Nevertheless, before Reference [38], an empirical method, which allows for an easy initial estimation of the conditions sufficient to have the stability of hydrate below subaqueous permafrost in absence of direct geological or geophysical data, was missed. In this Special Issue, for the first time a quick-look method that allows estimating the steady-state conditions for gas hydrate stability in the presence of subaqueous permafrost is presented.…”

Section: Arcticmentioning

confidence: 99%

Gas Hydrate: Environmental and Climate Impacts

et al. 2019

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This Special Issue reports research spanning from the analysis of indirect data, modelling, laboratory and geological data confirming the intrinsic multidisciplinarity of the gas hydrate studies. The study areas are (1) Arctic, (2) Brazil, (3) Chile and (4) the Mediterranean region. The results furnished an important tessera of the knowledge about the relationship of a gas hydrate system with other complex natural phenomena such as climate change, slope stability and earthquakes, and human activities.

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A Quick-Look Method for Initial Evaluation of Gas Hydrate Stability below Subaqueous Permafrost

Cited by 9 publications

References 53 publications

Gas Hydrates in Antarctica

Gas Hydrates in Antarctica

Permafrost and Gas Hydrate Stability Zone of the Glacial Part of the East-Siberian Shelf

Gas Hydrate: Environmental and Climate Impacts

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