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Chemical and isotopic features of seepage gas from mud volcanoes in southern margin of the Junggar Basin, NW China

文献类型：期刊论文

作者Xu, Wang5,8; Zheng, Guodong6,7; Ma, Xiangxian6,7; Fortin, Danielle4; Fu, Ching Chou3; Li, Qi2; Chelnokov, Georgy Alekseevich9; Ershov, Valery1
刊名APPLIED GEOCHEMISTRY
出版日期2022
卷号136页码:11
ISSN号0883-2927
关键词Geochemical processes Mud volcanoes Seepage gas Molecular and isotopic geochemistry Gas migration
DOI10.1016/j.apgeochem.2021.105145
英文摘要The chemical and stable carbon isotopic composition of seepage gases from three mud volcanoes were analyzed and compared with their corresponding reservoir gases in the southern margin of the Junggar Basin. The results showed a clear alteration of the seepage gases with respect to their chemical and isotopic composition. The seepage gases released from vents/craters were relatively enriched in methane and had a decrease in ethane and propane contents when compared to their corresponding reservoir gases. Advective process during gas ascent to the surface was the dominant post-genetic process that induced such molecular fractionation. The diffusive process during gas migration through sandy rocks or liquid horizons and gas-water-rock-microbe interactions also contributed to the molecular fractionation. High gas flux and eruptive behaviors triggered by earthquakes can however restrain this kind of fractionation. The seepage gases had relatively lighter carbon isotopes in CH4, similar carbon isotopes in C2H6 and heavier carbon isotopes in C3H8 when compared to their corresponding reservoir gases. Diffusive process led to the lighter carbon isotopes of the seepage gases due to mass-dependent kinetic isotope effect, whereas gas-water-rock-microbe interactions contributed to the heavier ones. The high variability of delta C-13(CO2) values might be caused by the differently biodegraded seepage systems or by the high sensitivity of delta C-13(CO2) values to gas-water-rock interactions. Such molecular and isotopic fractionations caused by geochemical processes provide distinctive indicators for a better understanding of gas migration from reservoirs to the ground surface. It is necessary to take these geochemical processes into consideration when we assess gas origin and source rocks based on seepage gases.
资助项目National Key Research and Development Program of China[2019YFA0708501] ; Open Fund of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation[PLC2020023] ; CAS Light of West China Program ; Chinese Academy of Sciences Visiting Professorship for Senior International Scientists[2018VMA0007] ; National Natural Science Foundation of China[41572352] ; National Natural Science Foundation of China[41402298]
WOS研究方向Geochemistry & Geophysics
语种英语
出版者PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号WOS:000728568800004
源URL[http://119.78.100.198/handle/2S6PX9GI/31003]  
专题中科院武汉岩土力学所
通讯作者Zheng, Guodong
作者单位1.Russian Acad Sci, Inst Marine Geol & Geophys, Far East Branch, Yuzhno Sakhalinsk 693022, Russia
2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
3.Acad Sinica, Inst Earth Sci, Taipei, Taiwan
4.Univ Ottawa, Dept Earth & Environm Sci, 25 Templeton St, Ottawa, ON K1N 6N5, Canada
5.Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610059, Peoples R China
6.Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China
7.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China
8.Chengdu Univ Technol, Coll Energy Resources, Chengdu 610059, Peoples R China
9.Russian Acad Sci, Far East Geol Inst, Prospect 100Letya 159, Vladivostok 690022, Russia
推荐引用方式
GB/T 7714		 Xu, Wang,Zheng, Guodong,Ma, Xiangxian,et al. Chemical and isotopic features of seepage gas from mud volcanoes in southern margin of the Junggar Basin, NW China[J]. APPLIED GEOCHEMISTRY,2022,136:11.
APA Xu, Wang.,Zheng, Guodong.,Ma, Xiangxian.,Fortin, Danielle.,Fu, Ching Chou.,...&Ershov, Valery.(2022).Chemical and isotopic features of seepage gas from mud volcanoes in southern margin of the Junggar Basin, NW China.APPLIED GEOCHEMISTRY,136,11.
MLA Xu, Wang,et al."Chemical and isotopic features of seepage gas from mud volcanoes in southern margin of the Junggar Basin, NW China".APPLIED GEOCHEMISTRY 136(2022):11.

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来源：武汉岩土力学研究所

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