Gas source for gas hydrate and its significance in the Qilian Mountain permafrost, Qinghai

Lü, Zifeng; Zhu, Yefei; Liu, Hui; Zhang, Yongqin; Chunshuang, Jin; Hu, Xia; Wang, Pingkang

doi:10.1016/j.marpetgeo.2013.01.003

Cited by 41 publications

(29 citation statements)

References 18 publications

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“…The correlation between methane content and heavy hydrocarbon content in surface soil-adsorbed gas can reflect the effusion of thermogenic gases that formed underground 17 . Geochemical analyses of cores from gas hydrate wells in the study area revealed that the gaseous portion of gas hydrates is dominated by methane and also contains a substantial amount of heavy hydrocarbons 27,29 . Such gases are generated by the large-scale migration of hydrocarbon gases in deep source rocks 37 .…”

Section: Resultsmentioning

confidence: 99%

“…The gas hydrates of the permafrost regions of the Qinghai-Tibet Plateau were first observed in 2008. They are type II hydrates that mainly occur in the pores and fissures of fine-grained sandstones, siltstones, mudstones, and oil shales of the Middle Jurassic Jiangcang Formation, at depths of 133-396 m 24,27,28 . The hydrocarbons in gas hydrates are mainly thermogenic, with a dryness coefficient (C 1 /C 2+3 ) ranging from 1.3 to 26.0 and a δ 13 C methane value ranging from −52.7‰ to −35.8‰ 29 .…”

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confidence: 99%

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Sources of seasonal wetland methane emissions in permafrost regions of the Qinghai-Tibet Plateau

Zhang

Shi

et al. 2020

Sci Rep

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In this study, systematic soil methane cycle geochemical monitoring was carried out in a typical gas hydrate region in the Qinghai-tibet plateau. Soil gas samples were collected for hydrocarbon components and carbon isotope analysis. Meanwhile, soil-methane fluxes from the upper active layer (20-30 cm) were monitored during six months of one year. The results of this research provide evidence of a new source of methane emission from wetland soils in permafrost regions: gas hydrate release. Sites with large methane emissions were found using flux monitoring, the characteristics of thermogenic methane were identified using carbon isotope tracing, and the relationship between emission by soils and effusion from gas hydrates was determined through correlation analyses of soiladsorbed hydrocarbons. Seasonal variation of methane emissions are also discussed by considering the emission of bacterial methane, thermogenic methane, and the absorption of methane from the soil active layer. These comprehensive findings provide valuable information for carbon cycle research of wetlands in permafrost regions.

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Section: Resultsmentioning

confidence: 99%

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confidence: 99%

Sources of seasonal wetland methane emissions in permafrost regions of the Qinghai-Tibet Plateau

Zhang

Shi

et al. 2020

Sci Rep

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“…Boswell等人 [19] 和 Koh等人 [20] [18] . 水合物样品激光拉曼光谱和含水合物岩心气体组分测试结果显示, 天然气水合物除含甲烷外, 还含有较高的乙烷、丙烷等重烃组分, 部分样品含有较高的二氧化碳, 认为水合物有可能为sⅡ型结构水合物 [5,[21][22][23][24][25][26] . 水合物饱和度估测范围差异较大, 卢振权等人 [27] .…”

Section: 祁连山冻土区天然气水合物产状类型分为两类unclassified

“…戴金星等人 [46] 依据δ 13 C 1 -δ 13 C 2 -δ 13 C 3 天然气成因鉴别图版 [52,53] [61] . 从各学者的气源岩主要评价指标的测试结果(表1 [24,56,57,[59][60][61] )来看, 每套气源岩评价指相符, 并且DK-9…”

Section: 获得了稳态的地温数据结果表明冻土层内的地温梯unclassified

Research progress of gas hydrates in the Qilian Mountain permafrost, Qinghai, Northwest China: Review

Wang¹,

Zhu²,

Lu³

et al. 2018

Sci. Sin.-Phys. Mech. Astron.

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“…Many works have been carried out regarding the origin of the alkane gas in the Qilian permafrost, and a consensus that the alkane gas is thermogenetic had been reached (Lu et al, 2010(Lu et al, , 2013aZhu et al, 2010;Cao et al, 2012;Cheng et al, 2016;Huang et al, 2016;Dai et al, 2017;Tan et al, 2017). However, genetic types and origins of gases from gas hydrates and free gas are still controversial and the following proposals have been made: (1) the alkane gas originated from coal-type gas, which is from Jurassic coalbearing strata (Zhu et al, 2010;Cao et al, 2012); (2) the alkane gas is derived from oil-type gas, which derives from the mudstone of upper Triassic strata (Lu et al, 2010(Lu et al, , 2013a(Lu et al, , 2013bHuang et al, 2016;Zuo et al, 2016);…”

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Origin of the Gas Hydrate and Free Gas in the Qilian Permafrost, Northwest China: Evidence from Molecular Composition and Carbon Isotopes

Tan

Yang

et al. 2021

Acta Geologica Sinica (Eng)

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The Qilian permafrost of the South Qilian Basin (SQB) has become a research focus since gas hydrates were discovered in 2009. Although many works from different perspectives have been conducted in this area, the origin of gas from gas hydrate is still controversial. Molecular composition and carbon isotope of 190 samples related to gas hydrates collected from 11 boreholes allowed exploration of genetic type, thermal maturity, biodegradation, as well as gas-source correlation of alkane gases from gas hydrates and free gases. Results indicate that alkane gases biodegraded after the formation of natural gas. According to differences in carbon isotopes of methane and their congeners (CH 4 , C 2 H 6 , C 3 H 8 ), the thermal maturity (vitrinite reflectance, VRo) of most alkane gases ranges from 0.6% to 1.5%, indicating a mature to high mature stage. The thermal maturity VRo of a small part of alkane gas (in boreholes DK5 and DK6) is higher than 1.3%, indicating a high mature stage. Alkane gases were mainly produced by secondary cracking, consisting of crude oilcracking gases and wet gases cracking to dry gases. Genetic types of alkane gases are primarily oil-type gases generated from shales and mudstones in the upper Yaojie Formation of Jurassic, with less coal-type gases originated from the mudstones in the Triassic Galedesi Formation and the lower Yaojie Formation of Jurassic. Carbon dioxides associated with alkanes from gas hydrates and free gases indicate the thermal decomposition and biodegradation of organic matter. The origins of natural gases from gas hydrates and free gases shed light on the evaluation of petroleum resource potential, deeply buried sediments, and petroleum resource exploration in the SQB.

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Gas source for gas hydrate and its significance in the Qilian Mountain permafrost, Qinghai

Cited by 41 publications

References 18 publications

Sources of seasonal wetland methane emissions in permafrost regions of the Qinghai-Tibet Plateau

Sources of seasonal wetland methane emissions in permafrost regions of the Qinghai-Tibet Plateau

Research progress of gas hydrates in the Qilian Mountain permafrost, Qinghai, Northwest China: Review

Origin of the Gas Hydrate and Free Gas in the Qilian Permafrost, Northwest China: Evidence from Molecular Composition and Carbon Isotopes

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