气候变化领域集成服务门户(CCPortal): The effect of slight to moderate biodegradation on the shale soluble organic matter composition of the upper triassic Yanchang formation, Ordos Basin, China

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DOI	10.1016/j.marpetgeo.2021.105021
	The effect of slight to moderate biodegradation on the shale soluble organic matter composition of the upper triassic Yanchang formation, Ordos Basin, China
	Meng, Qiang; Wang, Xiaofeng; Liao, Yuhong; Lei, Yuhong; Yin, Jintao; Liu, Peng; Shi, Baoguang
通讯作者	Wang, XF (通讯作者)，Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China.
发表日期	2021
ISSN	0264-8172
EISSN	1873-4073
卷号	128
英文摘要	Biodegradation greatly affects the physical properties and economic value of oil and gas reserves. Here, the composition of a suite of 27 samples of shale soluble organic matter from typical biodegraded shale profiles in the Upper Triassic Yanchang Formation, Ordos Basin, China, was analyzed using GC/MS/MS and ESI FT-ICR MS technology. The effects of slight to moderate biodegradation on the compositions of saturated hydrocarbons and polar nitrogen, sulfur, oxygen (NSO) compounds were assessed, revealing three key effects as biodegradation increases (1) Chloroform asphalt A (i.e. soluble organic matter). and saturated hydrocarbons gradually decrease, aromatic hydrocarbons gradually increase, non-hydrocarbons increase, and there is no regular change in asphaltene content. (2) The relative content of pristane (Pr) and phytane (Ph) to their corresponding n-alkanes increases gradually, indicating the n-alkanes decrease gradually. However, the resistance of the n-alkanes to biodegradation may be related to the carbon number and odd-even distribution. As the carbon number increases, the ability of n-alkanes to resist biodegradation increases, and even carbon number n-alkanes may be more resistant to biodegradation than odd carbon number n-alkanes. (3) No obvious changes in the relevant biodegradation indices of steranes and polar NSO compounds were observed in the entire profile. Hopane biodegradation indices were variable and sometimes contradictory with depth throughout the sediment profile. However, overall the data suggest the hopanes were not affected by biodegradation. Our results indicate that shale oil can also be biodegraded, and due to the tightness of shale reservoirs, slight to moderate biodegradation is common. Changes in shale oil content in the profile are the result of the primary migration and biodegradation together, with primary migration occurring mainly from the shale to the upper sandstone reservoirs. The above evidence shows that slight to moderate biodegradation has a relatively small impact on shale oil. However, in previous work we have shown that biodegradation has significant impacts on the shale gas content and its geochemical characteristics.
关键词	DEEP SUBSURFACE SULFUR-COMPOUNDS NSO COMPOUNDS LIAOHE BASIN CRUDE OILS HYDROCARBONS GAS ACIDS OXIDATION ORIGIN
英文关键词	Biodegradation; Shale oil; N-alkanes; Polar NSO compounds; Yanchang formation
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000647530400001
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/254689
作者单位	[Meng, Qiang; Liu, Peng; Shi, Baoguang] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China; [Meng, Qiang; Liao, Yuhong] Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China; [Wang, Xiaofeng] Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China; [Lei, Yuhong] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China; [Yin, Jintao] Res Inst Shaanxi Yanchang Petr Grp Co Ltd, Xian 710075, Peoples R China
推荐引用方式 GB/T 7714	Meng, Qiang,Wang, Xiaofeng,Liao, Yuhong,et al. The effect of slight to moderate biodegradation on the shale soluble organic matter composition of the upper triassic Yanchang formation, Ordos Basin, China[J]. 中国科学院西北生态环境资源研究院,2021,128.
APA	Meng, Qiang.,Wang, Xiaofeng.,Liao, Yuhong.,Lei, Yuhong.,Yin, Jintao.,...&Shi, Baoguang.(2021).The effect of slight to moderate biodegradation on the shale soluble organic matter composition of the upper triassic Yanchang formation, Ordos Basin, China.MARINE AND PETROLEUM GEOLOGY,128.
MLA	Meng, Qiang,et al."The effect of slight to moderate biodegradation on the shale soluble organic matter composition of the upper triassic Yanchang formation, Ordos Basin, China".MARINE AND PETROLEUM GEOLOGY 128(2021).