气候变化领域集成服务门户(CCPortal): A comprehensive study on the impacts of rock fabric on hydrocarbon generation and pore structure evolution of shale under semi-confined condition

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DOI	10.1016/j.marpetgeo.2020.104830
	A comprehensive study on the impacts of rock fabric on hydrocarbon generation and pore structure evolution of shale under semi-confined condition
	Song, Dongjun; Wang, Xiaoqi; Tuo, Jincai; Wu, Chenjun; Zhang, Mingfeng; Su, Long; He, Wei
通讯作者	Tuo, JC (通讯作者)，Chinese Acad Sci, Key Lab Petr Resources, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Gansu, Peoples R China.
发表日期	2021
ISSN	0264-8172
EISSN	1873-4073
卷号	124
英文摘要	Semi-confined pyrolysis experiments were performed on core and powdered samples taken from type-II lacustrine mudstone to investigate the effects of sample rock fabrics on hydrocarbon generation and porosity changes when shale is subjected to pyrolysis. The generated hydrocarbons were analysed by organic geochemical methods to reflect differences in constituents and carbon isotopes. Gas (N-2 and CO2) adsorption tests were applied to solid residues to characterize the formation and development of pores after the two series of pyrolysis experiments. Simple calculations indicate that hydrocarbons prefer to expulse as intact rock fabric is destroyed. Secondary cracking gas accounted for approximately 23-30% and 28-49% of all gaseous hydrocarbons in the powdered and core samples, respectively. Side reactions, such as mineral catalytic and recombination reactions, prevailed during the semi-closed pyrolysis of powdered sample at 300-500 degrees C, causing generated C3+ hydrocarbon yields to be lower than those of the core sample. Additionally, gaseous hydrocarbons generated from the powdered sample were characterized by more positive delta C-13 and higher iso-/n-C-4,C-5 and C-1/C1-5 values. Side reactions ceased at 500-550 degrees C, and corresponding ratios tended to equalize. For the powdered samples, a higher expulsive ratio of hydrocarbons led to better pore development, the mesopore volume increased with increasing temperatures, and micropore volume decreased above 450 degrees C. Comparatively, the mesopore volume decreased above 450 degrees C for the core sample, and the micropore volume decreased above 500 degrees C. These results are helpful for revealing the genetic characteristics of shale gas and for understanding the origins of organic-hosted pores of the Cambrian Niutitang shale in southern China. The study suggests that samples with intact rock fabric should be used in future laboratory pyrolysis tests to generate results that better reflect natural conditions.
关键词	PYROLYSIS EXPERIMENTS INSIGHT PETROLEUM SOURCE ROCKS CHANG 7 MEMBER ORGANO-CLAY COMPOSITES DEEP BASIN GAS HYDROUS PYROLYSIS BARNETT SHALE ORDOS BASIN MISSISSIPPIAN BARNETT ISOTOPIC REVERSALS
英文关键词	Rock fabrics; Semi-closed pyrolysis; Hydrocarbon expulsion-retention; Gaseous hydrocarbons; Porosity changes
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000606451800002
来源期刊	MARINE AND PETROLEUM GEOLOGY
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/253944
作者单位	[Song, Dongjun; Tuo, Jincai; Wu, Chenjun; Zhang, Mingfeng; Su, Long; He, Wei] Chinese Acad Sci, Key Lab Petr Resources, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Gansu, Peoples R China; [Song, Dongjun; He, Wei] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Wang, Xiaoqi] Res Inst Petr Explorat & Dev, Beijing 10083, Peoples R China
推荐引用方式 GB/T 7714	Song, Dongjun,Wang, Xiaoqi,Tuo, Jincai,et al. A comprehensive study on the impacts of rock fabric on hydrocarbon generation and pore structure evolution of shale under semi-confined condition[J]. 中国科学院西北生态环境资源研究院,2021,124.
APA	Song, Dongjun.,Wang, Xiaoqi.,Tuo, Jincai.,Wu, Chenjun.,Zhang, Mingfeng.,...&He, Wei.(2021).A comprehensive study on the impacts of rock fabric on hydrocarbon generation and pore structure evolution of shale under semi-confined condition.MARINE AND PETROLEUM GEOLOGY,124.
MLA	Song, Dongjun,et al."A comprehensive study on the impacts of rock fabric on hydrocarbon generation and pore structure evolution of shale under semi-confined condition".MARINE AND PETROLEUM GEOLOGY 124(2021).