Geochemical characteristics and genesis of hydrocarbons in superficial soil in continental permafrost regions in China
YANG Zhi-Bin1,2,3(), ZHOU Ya-Long1, ZHANG Fu-Gui1, ZHANG Shun-Yao1, SUN Zhong-Jun1
1. Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China 2. State Research Center of Modern Geological Exploration Engineering Technology, Langfang 065000, China 3. Tibet Institute of Geological Survey, Lhasa 850000, China
This study analyses the geochemical characteristics, genesis, and properties of hydrocarbon components using data of surface soil samples collected from the permafrost regions in the Qiangtang Basin, the Qilian Mountains, and the Mohe Basin. The results revealed that the hydrocarbon gases in the superficial soils in the permafrost regions mainly comprise methane, as well as a small amount of ethane, ethylene, propane, butane, and pentane. The hydrocarbon gases in the Qiangtang and Mohe basins are mainly of pyrolytic genesis and their types include soil-formed gas and the mixed gas of soil-formed gas and coalbed methane. In contrast, hydrocarbon gases in the superficial soil in the permafrost zone in the Qilian Mountains are of pyrolytic and biogenic genesis and their types include soil-formed gas, coalbed methane, and biogenetic gas. The study provides a basis for exploring oil and gas resources such as natural gas hydrates in the continental permafrost regions in China.
杨志斌, 周亚龙, 张富贵, 张舜尧, 孙忠军. 中国陆域冻土区浅表烃类地球化学特征及其成因分析[J]. 物探与化探, 2022, 46(3): 628-636.
YANG Zhi-Bin, ZHOU Ya-Long, ZHANG Fu-Gui, ZHANG Shun-Yao, SUN Zhong-Jun. Geochemical characteristics and genesis of hydrocarbons in superficial soil in continental permafrost regions in China. Geophysical and Geochemical Exploration, 2022, 46(3): 628-636.
Zhu Y H, Zhang Y Q, Wen H J, et al. Gas hydrates in the Qilian Mountain permafrost, Qinghai, northwest China[J]. Acta Geologica Sinca, 2009, 83(11): 1762-1771.
[4]
Lu Z, Zhu Y, Zhang Y, et al. Gas hydrate occurrences in the Qilian Mountain permafrost, Qinghai Province,China[J]. Cold Regions Science and Technology, 2011, 66(2-3): 93-104.
doi: 10.1016/j.coldregions.2011.01.008
Sun C Y, Niu B H, Wang H Y, et al. A study of gas hydrate geochemical exploration and deposit formation patterns in the Xisha ocean[J]. Earth Science Frontiers, 2005, 12(1):243-251.
[6]
金庆焕, 张光学, 杨木壮, 等. 天然气水合物资源概论[M]. 北京: 科学出版社, 2006.
[6]
Jin Q H, Zhang G X, Yang M Z, et al. Introduction to natural gas hydrate resources[M]. Beijing: Science Press, 2006.
Lu Z Q, Wu B H. Experimental research on geochemical methods for prospecting gas hydrates in marine sediments[J]. Geoscience, 2002, 16(3):299-304.
[8]
梁世容, 寇新琴. 利用地球化学异常探测水合物[J]. 南海地质研究, 2004:115-121.
[8]
Liang S R, Kou X Q. Prospecting gas hydrates by geochemical anomaly methods[J]. Greseach of Eological South China Sea, 2004:115-121.
[9]
Sun Z J, Yang Z B, Mei H, et al. Geochemical characteristics of the shallow soil above the Muli gas hydrate reservoir in the permafrost region of the Qilian Mountains,China[J]. Journal of Geochemical Exploration, 2014, 139: 160-169.
doi: 10.1016/j.gexplo.2013.10.006
[10]
Lu Z, Zhu Y, Liu H, et al. Gas source for gas hydrate and its significance in the Qilian Mountain permafrost, Qinghai[J]. Marine and Petroleum Geology, 2013, 43: 341-348.
doi: 10.1016/j.marpetgeo.2013.01.003
Xing X W, Liu S, Zhou H Y, et al. Geochemical behaviors of shallow oil in Muli permafrost and their significance as gas hydrate indicators[J]. Oil and Gas Geology, 2014, 35(2):159-166.
Qi F C, Qin M K, Liu W S, et al. Time-space configuration of uranium mineralization,sedimentary facies and oil & gasinduced alteration zone in Zhiluo formation,Ordos basin[J]. Uranium Geology, 2007, 23(2):65-70.
Dai J X. Natural gas hydrocarbon isotope characteristics and identification of various natural gas[J]. Natural Gas Earth Sciences, 1993, 4(2/3):1-40.
[15]
Liu S, Jiang Z, Liu H, et al. The natural-gas hydrate exploration prospects of the Nayixiong Formation in the Kaixinling-Wuli Permafrost, Qinghai-Tibet Plateau[J]. Marine and Petroleum Geology, 2016, 72: 179-192.
doi: 10.1016/j.marpetgeo.2016.01.022
Ji C J, Yin H S, Xia G Q, et al. Geochemical characteristics and significance of omatic hydrocarbon of Long'eni area crude oil in Qiangtang Basin[J]. Acta Sedimentologica Sinica, 2014, 32(2):391-398.
Wang C S, Yin H S, Liu C Y, et al. Discovery of paleo-oil-reservoir in Qiangtang basin in Tibet and its geological significance[J]. Oil and Gas Geology, 2004, 25(2):139-143.
Tan F Y, Liu S M, Cui W X, et al. Origin of gas hydrate in the Juhugeng mining area of Muli coalfield[J]. Acta Geologica Sinica, 2017, 91(5):1158-1167.
[19]
Li B, Sun Y, Guo W, et al. The mechanism and verification analysis of permafrost-associated gas hydrate formation in the Qilian Mountain, Northwest China[J]. Marine and Petroleum Geology, 2017, 86: 787-797.
doi: 10.1016/j.marpetgeo.2017.05.036
Huang X, Liu H, Zhang J Z, et al. Gnetic-type and its significance of hydrocarbon gases from permafrost-associated gas hydrate in Qilian Mountain[J]. Chinese Journal of Geology, 2016, 51(3):934-945.
Liu C L, He X L, Meng Q G, et al. Carbon and hydrogen isotopic compositions characteristics of the released gas from natural gas hydrates in the Qilian Mountain Permafrost[J]. Rock and Mineral Analysis, 2012, 31(3):489-494.
Lu Z Q, Zhu Y H, Zhang Y Q, et al. Gas source conditions for gas hydrate in Qilian Mountain permafrost of Qinghai and their implications[J]. Mineral Deposits, 2013, 32(5):1035-1044.
Liu S Q, Liu H, Jiang Z X, et al. Controlling factors of gas hydrate formation in southern Qinghai permafrost[J]. Earth Science Frontiers, 2017, 11(6):242-253.
Pang S J, Su X, He H, et al. Geological controlling factors of gas hydrate occurrence in Qilian Mountain permafrost China[J]. Earth Science Frontiers, 2013, 20(1): 223-239.
Song J M, Wu J Y, Wang L F. The application of pluorescence spectral analytical method to oil and gas geochemical exploration[J]. Geophysical and Geochemical Exploration, 2002, 26(5): 347-349.
Tang Y P, Ding X Y, Wu X H, et al. Features and genesis of regional geochemical fields of the main hydrocarbon-bearing basins in China[J]. Petroleum Exploration and Development, 2001, 28( 3):1-4.
[27]
Cheng B, Xu J, Lu Z, et al. Hydrocarbon source for oil and gas indication associated with gas hydrate and its significance in the Qilian Mountain permafrost, Qinghai, Northwest China[J]. Marine and Petroleum Geology, 2018, 89: 202-215.
doi: 10.1016/j.marpetgeo.2017.02.019
[28]
Zhao X, Deng J, Li J, et al. Gas hydrate formation and its accumulation potential in Mohe permafrost, China[J]. Marine and Petroleum Geology, 2012, 35(1): 166-175.
doi: 10.1016/j.marpetgeo.2012.04.003
Zhao X M, Deng J, Rao Z, et al. Occurrence of biogenic gas in the permafrost of Mohe Basin and its implication for gas hydrate exploration in continental permafrost,China[J]. Acta Petrolei Sinica, 2015, 36(8):954-965.
Wu H Y, Xin R C, Yang J G. The middle Jurassic sedimentary evolution and petroleum potential of the Mohe Basin[J]. Experimental Petroleum Geology, 2003, 25(2):116-121.
—羌塘盆地检测点; 
—祁连山地区检测点