Jiang Guanli

Bio: Jiang Guanli is an academic researcher from Chinese Academy of Sciences. The author has contributed to research in topics: Permafrost & Hydrate. The author has an hindex of 4, co-authored 7 publications receiving 66 citations.

Cooling effect differences of soil beneath open and closed block-stone embankments

Abstract: Block-stone embankment with cooling roadbed has effects on lowering permafrost temperature.However,effect variation of lowering permafrost temperature beneath block-stone embankment is a significant issue after block-stone layer is filled by sand or snow.The field experimental research on cooling permafrost temperature beneath open and closed block-stone embankments is developed to compare the change of permafrost temperature.The results show that extensive convection can be produced in the layer of block-stone for open block-stone embankment,but weak in the layer of block-stone for closed block-stone embankment.The different results from more extensive effect on cooling temperature for open block-stone embankment against that for closed block-stone show the superiority of open block-stone embankment.In view of soil temperature at the depth of 0.5–1.0 m beneath open and closed block-stone embankment,the difference is minor in summer,but large in winter,where the lowest temperature of soil beneath open block-stone embankment is about 5 ℃ lower than that beneath closed block-stone embankment.In view of effect depth of cooling temperature for the soil beneath embankment,the effect depth of cooling temperature is up to 6.0–10.0 m for open block-stone embankment,but is only about 1.5–3.0 m for closed one.

Effect of Particle Size of Ice on Methane Hydrate Self-Preservation below Freezing Point

Abstract: To study the impacts of the ice particle size on the self-preservation of methane hydrate,the dissociation experiment of methane hydrates were carried outIt contains six different sizes of ice particles under two different temperatures,aiming at analyzing the impacts of the total release volume of methane and the dissociation rate on the self-preservation timeThe results show that the size of the ice particle had evident impacts on the dissociation of methane hydratesThe total release volume of methane and the dissociation rate were inversely proportional to the ice particle size,the smaller the ice particle size,the faster the dissociation rateThis feature was very remarkable at the beginning of the dissociationAnd,the methane hydrate formed by the bigger size of ice particle had more effective self-preservation

Potential distribution of natural gas hydrate in the permafrost regions of qinghai-tibet plateau

Abstract: Natural Gas hydrate was found in permafrost regions and marine sediments.Permafrost distributes widely in the Qinghai-Tibet plateau which is the potential region for the distribution of natural gas hydrate in China.The temperature model of permafrost distribution is made by the three-dimensional zonation under the GIS.Meanwhile,a regression analysis of the permafrost thickness is carried out using the data of ground temperature drills and gives the spatial distribution characteristics of the annual ground temperature and the thickness of permafrost in the Qinghai-Tibet plateau.Combined with the thermodynamics conditions of forming natural gas hydrate,the potential regions for natural gas hydrate in the Qinghai-Tibet plateau have been studied.The result shows that the natural gas hydrate distributes mainly in northwestern Qiangtang basin,and the reserve is likely to be large.This region is the low temperature center of the Qinghai-Tibet plateau.And,the distribution ranges and reserves of natural gas hydrate decrease with the increase of the geothermal gradients.The thickness of permafrost and geothermal gradients below it are the most important controlling factors of the formation of natural gas hydrate.

The status of natural gas hydrate research in China: A review

Abstract: Over the past century, fossil fuels have provided the majority of China's energy. However, their extensive utilization leads to a shortage and environmental pollution. Recently, submarine and permafrost gas hydrate deposits have been investigated as a possible clean and sustainable energy source by governmental institutions, research organizations, and energy industries in China. The primary objective of this paper is to review 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 hydrates. To date, there are over 20 institutions and organizations in China committed to gas hydrate investigation, among which the Guangzhou Marine Geological Survey (GMGS) and the Chinese Academy of Geological Sciences (CAGS) etc. primarily focus on gas hydrate exploration research, while the China National Offshore Oil Corporation (CNOOC) Research Center, Guangzhou Institute of Energy Conversion (GIEC) and China University of Petroleum-Beijing (CUPB) etc. concentrate on gas hydrate mining technologies. In this paper, the occurrence and exploration of gas hydrates in both permafrost regions and the continental slope of China have been determined from numerous research contributions and are presented. Moreover, the latest progress in gas hydrate fundamental studies, including hydrate phase equilibria, hydrate formation mechanisms, hydrate thermal physical properties and the acoustics and resistivity characteristics of gas hydrates are briefly reviewed, and relevant data are gathered and compared. Emphasis is also placed on gas hydrate mining technologies and gas production using depressurization methods, thermal stimulation methods or other methods. Furthermore, the security of natural gas hydrate-bearing sediments during gas production and the environmental impacts of gas hydrate are identified. With additional financial and political support and advanced research facilities, research on gas hydrates in China is progressing rapidly but is still in its early developing stage, thus, future work should be undertaken with greater diligence.

Gas Hydrates in the Qilian Mountain Permafrost, Qinghai, Northwest China

Abstract: Qilian Mountain permafrost,with an area of about 10×104km2,is located in the north of Qinghai-Tibet plateau. It has of perfect conditions and great prospecting potential for gas hydrate. The Scientific Drilling Project of Gas Hydrate in the Qilian Mountain permafrost,which locates at the Jugenghu Mining Area in the Muli Coalfield,Tianjun County,Qinghai Province,has been implemented by China Geological Survey in 2008~2009. Four scientific drilling wells have been completed with a total footage of 2059.13m. Samples of gas hydrate were collected separately in the holes of DK-1,DK-2 and DK-3. Gas hydrate is hosted under permafrost zone at the 133~396m interval. The samples are white or ivory crystal and easily burning. Distinct low temperature anomaly has been identified by infrared camera. The gas hydrate-bearing cores strongly bubble in water. Gas-bubble and water-drop emit from the samples and then retain characteristic honeycombed structure. The typical spectrum curve of gas hydrate is detected using Raman spectrometry. Furthermore,the logging profile also indicates high electrical resistivity and sonic velocity. Gas hydrate in Qilian Mountain is found within a thinner permafrost zone with a shallower buried depth and characterized by more complex gas component and coalbed methane origin,suggesting a new type of hydrate.