The geological process for gas hydrate formation in the Qilian Mountain permafrost

Lü, Zifeng; Zhai, Gangyi; Zuo, Yinhui; Wang, Quanfeng; Fan, Dongwen; Tang, Shiqi; Hu, Daodong; Liu, Hui; Wang, Ting; Zhu, Yefei; Xiao, Rui

doi:10.1080/10916466.2019.1594283

Cited by 6 publications

(18 citation statements)

References 26 publications

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“…In the gas hydrate regions of the world, there are two different ways for gas hydrate occurrence in sedimentary strata. One occurs in the fractures of the rock, whereas the other occurs in the pores of the rock . This suggests that degree of the formation fracture development is vital for the formation and enrichment of gas hydrate.…”

Section: Discussionmentioning

confidence: 99%

“…One occurs in the fractures of the rock, whereas the other occurs in the pores of the rock. 7,8,47 This suggests that degree of the formation fracture development is vital for the formation and enrichment of gas hydrate. Ultrasonic imaging logging can reflect in situ geological characteristics of the borehole wall and effectively identify formation fractures and fracture zones.…”

Section: Identifying the Favorable Reservoir Of Gas Hydrate By Ultrmentioning

confidence: 99%

“…As a new cleaner alternative energy source of huge reserve, gas hydrate has attracted more and more attention, and more than 100 regions have directly or indirectly found occurrences of gas hydrate zones. In China, gas hydrate samples were acquired successfully in the Shenhu area of the South China Sea in May 2007 and were obtained by drilling for the first time in the Qilian Mountain permafrost region of Qinghai Province in November 2008 . In recent years, some systematic investigations, including geological methods, geophysical methods, and geochemical methods, were carried out in gas hydrate potential regions of China, and the results showed that these permafrost regions had a good prospect for the formation and accumulation of gas hydrates .…”

Section: Introductionmentioning

confidence: 99%

“…In China, gas hydrate samples were acquired successfully in the Shenhu area of the South China Sea in May 2007 and were obtained by drilling for the first time in the Qilian Mountain permafrost region of Qinghai Province in November 2008. [6][7][8][9] In recent years, some systematic investigations, including geological methods, geophysical methods, and geochemical methods, were carried out in gas hydrate potential regions of China, and the results showed that these permafrost regions had a good prospect for the formation and accumulation of gas hydrates. 6,7 These researches have greatly promoted the process of gas hydrate prospecting in permafrost regions of China.…”

Section: Introductionmentioning

confidence: 99%

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A preliminary study of the gas hydrate stability zone in a gas hydrate potential region of China

Xiao

Zou

Yang

et al. 2019

Energy Science & Engineering

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Due to its significance for gas hydrate accumulation, the gas hydrate stability zone (GHSZ) is an essential condition for successful gas hydrate exploration and is usually controlled by three main factors: gas components, geothermal gradient, and permafrost thickness. Based on the core and conventional log data of gas hydrate potential region, the CSMHYD program was adopted to simulate the influences of above three factors on the thickness of the GHSZ. When the gas components of the gas hydrate were CH4, C2H6, and C3H8, with the CH4 percentage ranging from 50% to 100%, the average GHSZ thickness can reach 1000 m according to the forward simulation results. When the gas hydrate was composed of CH4 and one of C2H6, C3H8, H2S, and CO2, the influence order of the above four gases on the thickness of GHSZ is as follows: H2S ＞ C2H6 ＞ C3H8 ＞ CO2. Under the gas components of 90% CH4, 5% C2H6, and 5% C3H8, the thickness of GHSZ decreased rapidly as the geothermal gradient increased following an exponential relation with a correlation of 99.92% and increased slowly as permafrost thickness increased following a linear relation with a correlation of 99.9%. In addition, the thickness of a gas hydrate favorable reservoir was determined by comprehensive log methods as 500 m. We conclude that a reservoir within 500 m below the permafrost layer is favorable for gas hydrate reservoir formation.

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Section: Discussionmentioning

confidence: 99%

Section: Identifying the Favorable Reservoir Of Gas Hydrate By Ultrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A preliminary study of the gas hydrate stability zone in a gas hydrate potential region of China

Xiao

Zou

Yang

et al. 2019

Energy Science & Engineering

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“…Understanding the source of gas hydrates is necessary for evaluating the resource, climate change and geohazard potential of gas hydrates. Although much research has focused on topography, oil and gas resources evaluation, coal exploration and extensive seismic investigation of the geological setting in Muli Basin, a series of geochemical and geological characteristics of gas hydrate has been carried out in recent years (Zhu et al 2009;Lu et al 2010). A series of achievements on the gas hydrates, such as their molecular and isotopic composition, microbiology population, seismic activity features and log response, have been gained (Wang et al 2009;Zhu et al 2010;Lu et al 2010;Huang et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Origin of the hydrate bound gases in the Juhugeng Sag, Muli Basin, Tibetan Plateau

Liu

Tan

Huo³

et al. 2019

Int J Coal Sci Technol

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The Juhugeng Sag, located in northwest of the Muli Basin, Tibetan Plateau, has been investigated for coal and petroleum resources during the past several decades. There have been successful recoveries of gas hydrates during recent years from the Middle Jurassic Yaojie Formation that offer insight into the origin of the hydrocarbon gases from the complex sag feature. This study examines the organic geochemical and stable carbon isotopic characteristics of shale and coal samples from the Middle Jurassic Yaojie Formation of the Juhugeng Sag, as well as compares with carbon isotopes, gas amounts and components of hydrate-bound gas. A total of 19 samples from surface mining, including 12 samples of black shale and 7 samples of coal, were analysed using a micro-photometer, a gas chromatograph, Rock-Eval and isotope methods. All the shale samples contained 100% type I kerogen, and the random vitrinite reflectance values vary from 0.65% to 1.32% and achieve thermal pyrolysis phase. Isotope values of methane (d 13 C ranging from-52.6% to-39.5% and dD ranging from-285% to-227%) in the hydrate bound gases suggest that the methane originates mainly from thermogenic contributions. It is proposed that ethane from the gas hydrate is thermogenic-produced, and this conjecture is supported by the fact that most of the gas hydrate also contains more than 30% of thermogenic C 2? hydrocarbons and is similar to structure II hydrate. Carbon isotope data from the gas hydrates show a positive carbon isotope series (d 13 C 1-\ d 13 C 2 \ d 13 C 3), with ethane d 13 C values being lighter than-28.5%, as high consistency with source rocks from the Jurassic period indicate thermal oil-prone gas. A model of the accumulation of gas hydrate is plotted. However, the gaseous sources of gas hydrates may be a subject for more research.

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Pre-cenozoic evolution of the northern Qilian Orogen from zircon geochronology: Framework for early growth of the northern Tibetan Plateau

Zuza

Chen

et al. 2021

Palaeogeography, Palaeoclimatology, Palaeoecology

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The geological process for gas hydrate formation in the Qilian Mountain permafrost

Cited by 6 publications

References 26 publications

A preliminary study of the gas hydrate stability zone in a gas hydrate potential region of China

A preliminary study of the gas hydrate stability zone in a gas hydrate potential region of China

Origin of the hydrate bound gases in the Juhugeng Sag, Muli Basin, Tibetan Plateau

Pre-cenozoic evolution of the northern Qilian Orogen from zircon geochronology: Framework for early growth of the northern Tibetan Plateau

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