Modeling on Gas Hydrate Formation Conditions in the Qinghai-Tibet Plateau Permafrost
TL;DR: Based on the field-investigated gas geochemistry, the modeling of gas hydrate formation conditions in the Qinghai-Tibet plateau permafrost (QTPP) was conducted in this article.
Abstract: Based on the field-investigated gas geochemistry, the modeling of gas hydrate formation conditions is conducted in the Qinghai-Tibet plateau permafrost (QTPP) in combination with predecessors' data such as the permafrost ground temperature (T0), the thermal gradient within the frozen layer (G1) and the thermal gradient below the frozen layer (G2). The modeled results show that the permafrost characteristics generally meet the requirements for gas hydrate formation conditions in the study area. Gas composition, temperaturerelated permafrost parameters (e.g. T0,G1,G2) are the most important factors affecting gas hydrate formation conditions in the study area, whose spatial variations may cause the heterogeneity of gas hydrate occurrences. The most probable gas composition to form gas hydrate is the hybrid of methane and weight hydrocarbon gases (ethane and propane). In the predicted gas hydrate locations, the minimal upper depth of gas hydrate occurrence is less than one hundred meters and the maximum lower depth can reach one thousand meters with the thickness up to several hundred meters. Compared with Canadian Mallik gas hydrate field, the QTPP is favorable for gas hydrate formation in aspects of G1, G2 and gas composition, except for relatively thin permafrost, still suggesting great gas hydrate potentials.
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TL;DR: In this paper, the authors used a single vertical well by depressurization method to simulate the gas production potential of the gas hydrate deposits in the Qilian Mountain permafrost.
114 citations
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.
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Cites result from "Modeling on Gas Hydrate Formation C..."
...Since the preliminary results were possibly indicative of gas hydrate potentials in the Qinghai-Tibet railway permafrost (Lu et al., 2009), China Geological Survey formally initiated a project for “investigation on gas hydrate prospects within permafrost areas around China from 2004 to 2006”....
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TL;DR: In this paper, the authors employed the huff and puff method using a single horizontal well in the middle of the Hydrate-Bearing Layer (HBL) to numerically investigate the gas production potential from hydrates at the DK-3 drilling site of the Qilian Mountain permafrost, which is located in the north of the Qinghai-Tibet plateau.
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TL;DR: Zhang et al. as mentioned in this paper investigated the commercial viability of gas hydrate deposits in the Qinghai-Tibet Plateau permafrost during the Scientific Drilling Project of Gas Hydrate.
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TL;DR: In this article, the characteristics of occurrence, structure and gas composition of marine gas hydrate from the South China Sea (SCS) were compared with those from Qilian Mountain permafrost (QMP) in 2009 and 2013.
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References
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TL;DR: In this article, the current state and the prospects of the research and development for natural gas hydrate in the world were analyzed and policies were given which should be used in our country for Natural gas hydyate research.
Abstract: Natural gas hydrates (occasionally called gas clathrates) are ice like crystalline substances containing hydrocarbon and non hydrocarbon gas. Gas hydrates were discovered firstly in laborary in 1810. Over a century later, in 1934 the observation of hydrates in pipelines caused them to be think with industrial problem. In 1965 the third era of hydrate research was entered as mankind determined the existence of reserves of hydrates in nature.This paper gave the current state and analysed the prospects of the research and development for natural gas hydrate in the world.Gas hydrate resource potential was evaluated for all over the world,too.At the last part,the policies were given which should be used in our country for natural gas hydyate research.
15 citations
"Modeling on Gas Hydrate Formation C..." refers background in this paper
...In nature, gas hydrate occurs both in marine subsurface sediment with water depth of greater than 300 meters and in permafrost zone below subsurface depth of more than 130 meters[1]....
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...Peculiarly the characteristics of world-known permafrosts suggest that gas hydrate may occur within the frozen layer as well as below the frozen layer; for example the Messoyakha gas hydrate field, Russia occurs at the depth of 250~350 m below its frozen layer([1]), and the similar case happens to the Mallik gas hydrate field in Canada, which probably indirectly indicates there are also great potentials of gas hydrate in the QTPP....
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TL;DR: In this article, the authors used the thermodynamic model of Holder and John (1982) to calculate the depth and thickness of gas hydrate stability zones for the forty-six wells located in Northern Alaska and showed that only ten wells showed definite evidence of the presence of gas hydrates.
14 citations
Journal Article•
TL;DR: In this paper, the authors investigated the thermodynamic conditions for the formation of gas hydrates in permafrost regions on the Qinghai-Tibet plateau and found that the best thermodynamics condition is that the thermal gradient is close to or slightly higher than that of thawed soils near the permfrost bottom.
Abstract: Gas hydrates are a kind of new clean energy They are found in low-temperature and high-pressure environments in permafrost and marine sediments The permafrost on Qinghai-Tibet Plateau, which accounts for about half of the total area of the plateau, may be a potential region of gas hydrates According to the permafrost characteristics of the plateau and thermodynamic conditions of formation of gas hydrates, the relationships of the permafrost thermal gradients and thickness with the thermodynamic conditions of formation of gas hydrates are discussed In addition, the possibility of the existence of gas hydrates on Qinghai-Tibet Plateau is also preliminarily analyzed The results show that the permafrost regions on the plateau have basic thermodynamics conditions for formation of gas hydrates The best thermodynamics condition is that the thermal gradient of permafrost is close to or slightly higher than that of thawed soils near the permafrost bottom, and the lower the thermal gradient of thawed soils, the more easily gas hydrates will be formed It is estimated that the shallowest burial depth of the top of the gas hydrate layer is ～74 m and that the deepest bottom of the layer is up to one thousand meters
12 citations
Journal Article•
TL;DR: Based on the formation conditions of terrestrial natural gas hydrates, the authors discusses from several aspects the possibility of forming hyddrates and the favorable locations where natural gas hydrate accumulations are most likely to occur.
Abstract: The Qinghai-Tibet Plateau has harsh natural conditions and on it the largest permafrost region in China is distributed and Meso-Cenozoic marine strata and marine and terrestrial basins are well devel-oped,which provides advantageous conditions for forming natural gas hydrate accumulations on the plateau.Based on the formation conditions of terrestrial natural gas hydrates,the paper discusses from several aspects the possibility of forming hydrates and the favorable locations where natural gas hydrate accumulations are most likely to occur.Finally the authors indicate that the Qinghai-Tibet Plateau has good conditions for forming natural gas hydrate accumulations and that the most favorable area is the outcrop area of accumula-tions of petroleum-bearing basins in northern Tibet.The study of natural gas hydrate accumulations has not only significance of resources but also great environmental significance.
10 citations
Journal Article•
TL;DR: In this paper, the authors analyzed the geological and tectonic characteristics for generating gas hydrate in the Dongsha continental slope of the South China Sea and suggested that tectonics and sedimentation play the important roles in the generation of methane hydrate.
Abstract: The geological and tectonic characteristics for generating gas hydrate in the Dongsha continental slope of the South China Sea were analyzedIt is suggested that tectonics and sedimentation play the important roles in the generation of methane hydrateThe range of occurrence of bottom simulating reflector(BSR) in the Dongsha continental slope of the South China Sea was mapped by means of some high-resolution seismic dataThe BSR clearly appeared on the seismic profiles of the lower slope,whereas it was few discovered in the upper slopeThe BSR was mainly distributed in the transition zone between the continental crust and oceanic crust southwestward the Dongsha IslandsThe background of the region was characterized by the passive continental marginThe BSR were distributed in the range of debris flow and turbidity sedimentationThis means that debris and turbidity are sufficiently high to allow the vertical transport of large volumes of methane and to form the gas hydrateThe occurrence of BSR was resulted from anomaly overpressure fluid including gas and water,because of the rapid sedimentary rate revealed by ODP drilling and piston cores during the Late CenozoicThe high heat flow values indicate that the active tectonics and deep crust fluid in the region benefit to the generation of gas hydrateOtherwise,few BSR and gas hydrate occurred in the upper slope,because of the thin sedimentary layers and serious tectonic erosion
10 citations