Modeling on Gas Hydrate Formation Conditions in the Qinghai-Tibet Plateau Permafrost
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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.read more
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Numerical simulation of gas production from hydrate deposits using a single vertical well by depressurization in the Qilian Mountain permafrost, Qinghai-Tibet Plateau, China
Jiafei Zhao,Tao Yu,Tao Yu,Yongchen Song,Di Liu,Weiguo Liu,Yu Liu,Mingjun Yang,Xuke Ruan,Yanghui Li +9 more
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.
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
Numerical simulation of gas production potential from permafrost hydrate deposits by huff and puff method in a single horizontal well in Qilian Mountain, Qinghai province
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.
Journal ArticleDOI
Evaluation of gas production from Qilian Mountain permafrost hydrate deposits in two-spot horizontal well system
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.
Journal ArticleDOI
Comparison of the characteristics for natural gas hydrate recovered from marine and terrestrial areas in China
Changling Liu,Qingguo Meng,Xingliang He,Chengfeng Li,Yuguang Ye,Lu Zhenquan,Youhai Zhu,Yonghong Li,Jinqiang Liang +8 more
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.
References
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Journal Article
Geological features and hazard effects of the Wuli active fault system on the northern Qinghai-Tibet Plateau
TL;DR: According to field observations, it is estimated that the left-lateral strike-slip rate and vertical slip rate of typical active faults are 1.2-3.5mm /a and 0.5-3 5mm/a respectively as mentioned in this paper.
Surface Fractures and Their Hazard Effects on Engineering Construction along the Golmud-Lhasa Railway across the Tibetan Plateau
TL;DR: After field geological survey on the scale of 1∵2,000 and comparative measurement in different seasons, four types of surface fractures, seismic fractures, fault fracturs, permafrost fractures and ice fractures, were discovered along the Golmud Lhasa railway across the Tibetan Plateau after engineering geological mapping as mentioned in this paper.
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Geological features of active faults in east hohxil mountains of northern tibetan plateau
TL;DR: Wu et al. as mentioned in this paper discovered 14 strike-slip active faults based on detail geological surveys and trench cross-sections, constituting the left-lateral strikeslip fault zones of Wudaoliang, of North Hohxil, South HohXil, and the active fault system of east Hohaxil Mts.
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Geological features and hazard effects of the fenghuoshan active fault system of north tibetan plateau
Abstract: The Fenghuoshan active fault system located in Northern Tibetan Plateau consists of Northern Fenghuoshan active fault, Fenghuoshan active fault, Erdaogou active fault and Southern Erdaogou active fault.The left lateral strike slip rate of Northern Fenghuoshan active fault F 24 since 22 100 a is 4.07 mm/a; that of Erdaogou active fault F 26 4 since 16 300 a is 1.1 mm/a;and that of active fault in south of Erdaogou F 27 ,F 27 1 and F 27 8 in Late Pliocene Holocene is 3.52 mm/a, 2.98 mm/a and 0.51 mm/a respectively,while fault F 26 4 ,F 27 and F 27 8 displayed a vertical slip rate of 0.12 ～0.51 mm/a in Holocene.Heterogeneous freezing deformation,freezing domes,surface fracture zones and earthquakes are distributed along faults of the Fenghuoshan active fault system,thus endangering the safety of the Golmud-Lhasa railway,highway and pipe line.