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DOI	10.1016/j.apgeochem.2021.105145
	Chemical and isotopic features of seepage gas from mud volcanoes in southern margin of the Junggar Basin, NW China
	Xu, Wang; Zheng, Guodong; Ma, Xiangxian; Fortin, Danielle; Fu, Ching Chou; Li, Qi; Chelnokov, Georgy Alekseevich; Ershov, Valery
通讯作者	Zheng, GD (通讯作者)，Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China.
发表日期	2022
ISSN	0883-2927
EISSN	1872-9134
卷号	136
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.
关键词	NATURAL-GAS CARBON ISOTOPES METHANE FRACTIONATION DIFFUSION HYDROCARBONS MIGRATION
英文关键词	Geochemical processes; Mud volcanoes; Seepage gas; Molecular and isotopic geochemistry; Gas migration
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000728568800004
来源期刊	APPLIED GEOCHEMISTRY
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254566
作者单位	[Xu, Wang] Chengdu Univ Technol, Coll Energy Resources, Chengdu 610059, Peoples R China; [Zheng, Guodong; Ma, Xiangxian] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Peoples R China; [Zheng, Guodong; Ma, Xiangxian] Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China; [Xu, Wang] Chengdu Univ Technol, State Key Lab Oil & Gas Reservoir Geol & Exploita, Chengdu 610059, Peoples R China; [Fortin, Danielle] Univ Ottawa, Dept Earth & Environm Sci, 25 Templeton St, Ottawa, ON K1N 6N5, Canada; [Fu, Ching Chou] Acad Sinica, Inst Earth Sci, Taipei, Taiwan; [Li, Qi] Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China; [Chelnokov, Georgy Alekseevich] Russian Acad Sci, Far East Geol Inst, Prospect 100Letya 159, Vladivostok 690022, Russia; [Ershov, Valery] Russian Acad Sci, Inst Marine Geol & Geophys, Far East Branch, Yuzhno Sakhalinsk 693022, 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]. 中国科学院西北生态环境资源研究院,2022,136.
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.
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).