Journal ArticleDOI
Formation condition and distribution prediction of gas hydrate in Qinghai-Tibet Plateau permafrost
TLDR
Based on the thickness of frozen layer and thermal gradient in Qinghai-Tibet Plateau permafrost, the occurrence and distribution of gas hydrate in the low-middle latitude and high altitude permaculture region was predicted by using the thermodynamic method of natural gas hydrates stable temperature and pressure.Abstract:
Permafrost is one of major geological environments for gas hydrate occurrences. Mean altitude is over 4000m and the permafrost area is about 1.4 x 10(6)km(2) in Qinghai-Tibet Plateau. Based on the thickness of frozen layer and thermal gradient in Qinghai-Tibet Plateau permafrost, the occurrence and distribution of gas hydrate in the low-middle latitude and high altitude permafrost is predicted by using the thermodynamic method of natural gas hydrate stable temperature and pressure. The thermodynamic phase equilibrium of thermogenic and biogenic gas hydrate imply that gas hydrate is buried in depth from similar to 27 to similar to 2070m, and the resource potential of natural gases caged in hydrates are estimated as about 1.2 x 10(11) to 2.4 x 10(14)m(3) in Qinghai-Tibet Plateau permafrost. Gas hydrate is propitious to occur where the frozen layer is thicker and thermal gradient is lower in the permafrost. Seasonal change of air temperature in Qinghai-Tibet Plateau affects only the uppermost sediments 10m and does not affect gas hydrate that is buried below 30m. Under the global warming, gas hydrate will be unstable and degrade in the permafrost. Its distribution area will be gradually reduced and finally disappear in Qinghai-Tibet Plateau permafrost.read more
Citations
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Journal ArticleDOI
Permafrost degradation and its environmental effects on the Tibetan Plateau: A review of recent research
TL;DR: A significant portion of the Tibetan Plateau is underlain by permafrost, and is highly sensitive to climate change Observational data from recent Chinese investigations on permfrost degradation and its environmental effects in the Tibetan region indicate that a large portion of Tibet has experienced significant warming since the mid-1950s The air temperature increase is most significant in the central, eastern, and northwestern parts of the Plateau The warming trend in the cold season was greater than that in the warm season.
Journal ArticleDOI
The status of natural gas hydrate research in China: A review
TL;DR: In this paper, the potential studies pertaining to gas hydrate exploration and resource assessment, the safe and efficient exploitation of gas hydrates and the basic properties of gas hyddrates are reviewed.
Journal ArticleDOI
Gas Hydrates in the Qilian Mountain Permafrost, Qinghai, Northwest China
Youhai Zhu,Yongqin Zhang,Huaijun Wen,Zhenquan Lu,Zhiyao Jia,Yong-Hong Li,Qinghai Li,Changling Liu,Pingkang Wang,Xingwang Guo +9 more
TL;DR: Wang et al. as mentioned in this paper used Raman spectrometers to detect gas hydrate in Qilian Mountain permafrost, which was found to have a more complex gas component and coalbed methane origin, suggesting a new type of hydrate.
Journal ArticleDOI
Gas hydrate occurrences in the Qilian Mountain permafrost, Qinghai Province, China
TL;DR: In this article, four scientific experimental wells were drilled in the Qilian Mountain permafrost of Qinghai Province, China, in 2008 and 2009 to evaluate the type of clathrates recovered from these sites, including structures containing large and small cages of hydrocarbon gases.
Journal ArticleDOI
Experimental study on characteristics of methane hydrate formation and dissociation in porous medium with different particle sizes using depressurization
Lei Zhan,Yi Wang,Xiao-Sen Li +2 more
TL;DR: In this paper, different quartz sand particle sizes were applied to simulate the sediment of hydrate reservoir to evaluate the exchange ability of gas and water in the pores of the sediment during hydrate dissociation.
References
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Methane hydrate — A major reservoir of carbon in the shallow geosphere?
TL;DR: The estimated amount of organic carbon in the methane-hydrate reservoir greatly exceeds that in many other reservoirs of the global carbon cycle as discussed by the authors, such as the atmosphere (3.6 Gt), terrestrial biota (830 Gt); terrestrial soil, detritus and peat (1960 Gt).
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Are Proterozoic cap carbonates and isotopic excursions a record of gas hydrate destabilization following Earth's coldest intervals?
TL;DR: In this article, the authors propose that these enigmatic deposits are related to the destabilization of gas hydrate in terrestrial permafrost following rapid postglacial warming and flooding of widely exposed continental shelves and interior basins.
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Role of methane clathrates in past and future climates
TL;DR: In this paper, the authors estimate that about 11,000 Gt of carbon is stored in clathrates under permafrost regions and about 400 Gt under ocean sediments.
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Is the extent of glaciation limited by marine gas-hydrates
TL;DR: In this article, the authors consider the response to sea-level changes by the immense amount of gas-hydrate that exists in continental rise sediments, and suggest that release of methane trapped in the deep-sea sediments as gashydrates may provide a negative feedback to advancing glaciation.