Gas generation and its isotope composition during coal pyrolysis: Potential mechanism of isotope rollover

doi:10.1016/j.fuel.2018.05.029

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院新生代地质与环境重点实验室

	Gas generation and its isotope composition during coal pyrolysis: Potential mechanism of isotope rollover
	Ni, Yunyan 1; Gao, Jinliang 2; Chen, Jianping 1; Liao, Fengrong 1; Liu, Jiaqi 2; Zhang, Dijia 1
刊名	FUEL
	2018-11-01
卷号	231 页码:387-395
关键词	Isotope rollover Carbon isotope Hydrogen isotope Coal-derived gas Shale gas
ISSN号	0016-2361
DOI	10.1016/j.fuel.2018.05.029
文献子类	Article
英文摘要	Recent studies on both conventional (thermogenic gas) and unconventional (shale gas) gases show comparable carbon/hydrogen isotope rollover, i.e., before the rollover point, carbon/hydrogen isotope increases with increasing thermal maturity (or decreasing gas wetness), while after the rollover point, the gas component (i.e., ethane, propane, etc.) becomes more depleted in C-13 or H-2 with increasing thermal maturity. In order to further investigate potential mechanism of the isotope rollover, combined with previous researches on isotope rollover, this study carried out two batches of pyrolysis experiments on a low mature coal sample from the Songliao Basin, China at constant temperatures for about 72 h under the condition with added water and without added water. The results demonstrate that carbon and hydrogen isotope rollover of ethane and propane started at 500 degrees C, no matter with added water or without added water. Combined with previous studies on gases of various origins, it is found that such isotopic anomalies were a common phenomenon at high thermal mature stage, despite of what kind of the source rocks and whether adding water or not under the laboratory condition. This is likely caused by the mixing of gases directly from the decomposition of macromolecule of kerogen and those from the tightly entrapped straight-chain species in kerogen at relatively high thermal mature stage. These straight-chain species are normally entrapped in the kerogen, and will probably be released at high thermal maturation stage. Marine facies source rocks from southern China also demonstrate the existence of such tightly entrapped hydrocarbons at very high thermal maturity. The results may have important significance on the gas exploration at relatively high mature stage and have a guidance on the gas production changes during the exploration.
WOS关键词	MISSISSIPPIAN BARNETT SHALE ; SONGLIAO BASIN ; NATURAL GASES ; GEOCHEMICAL CHARACTERISTICS ; N-ALKANES ; CARBON ; CHINA ; HYDROGEN ; FRACTIONATION ; HYDROCARBONS
WOS研究方向	Energy & Fuels ; Engineering
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000435217500044
资助机构	NSFC(41472120) ; NSFC(41472120) ; China National Major ST Projects(2016ZX05007-01) ; China National Major ST Projects(2016ZX05007-01) ; NSFC(41472120) ; NSFC(41472120) ; China National Major ST Projects(2016ZX05007-01) ; China National Major ST Projects(2016ZX05007-01) ; NSFC(41472120) ; NSFC(41472120) ; China National Major ST Projects(2016ZX05007-01) ; China National Major ST Projects(2016ZX05007-01) ; NSFC(41472120) ; NSFC(41472120) ; China National Major ST Projects(2016ZX05007-01) ; China National Major ST Projects(2016ZX05007-01)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/88204]
专题	地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者	Ni, Yunyan
作者单位	1.PetroChina Res Inst Petr Explorat & Dev, Beijing 100083, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Ni, Yunyan,Gao, Jinliang,Chen, Jianping,et al. Gas generation and its isotope composition during coal pyrolysis: Potential mechanism of isotope rollover[J]. FUEL,2018,231:387-395.
APA	Ni, Yunyan,Gao, Jinliang,Chen, Jianping,Liao, Fengrong,Liu, Jiaqi,&Zhang, Dijia.(2018).Gas generation and its isotope composition during coal pyrolysis: Potential mechanism of isotope rollover.FUEL,231,387-395.
MLA	Ni, Yunyan,et al."Gas generation and its isotope composition during coal pyrolysis: Potential mechanism of isotope rollover".FUEL 231(2018):387-395.