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The effect of slight to moderate biodegradation on the shale soluble organic matter composition of the upper triassic Yanchang formation, Ordos Basin, China

文献类型：期刊论文

作者Meng, Qiang3,4; Wang, Xiaofeng5; Liao, Yuhong4; Lei, Yuhong1; Yin, Jintao2; Liu, Peng3; Shi, Baoguang3
刊名MARINE AND PETROLEUM GEOLOGY
出版日期2021-06-01
卷号128页码:12
关键词Biodegradation Shale oil N-alkanes Polar NSO compounds Yanchang formation
ISSN号0264-8172
DOI10.1016/j.marpetgeo.2021.105021
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.
WOS关键词DEEP SUBSURFACE ; SULFUR-COMPOUNDS ; NSO COMPOUNDS ; LIAOHE BASIN ; CRUDE OILS ; HYDROCARBONS ; GAS ; ACIDS ; OXIDATION ; ORIGIN
资助项目National Nature Science Foundation of China[41903013] ; State Key Laboratory of Organic Geochemistry[SKLOG-201730] ; "Western Light Project" of the Chinese Academy of Sciences
WOS研究方向Geology
语种英语
WOS记录号WOS:000647530400001
出版者ELSEVIER SCI LTD
资助机构National Nature Science Foundation of China ; National Nature Science Foundation of China ; State Key Laboratory of Organic Geochemistry ; State Key Laboratory of Organic Geochemistry ; "Western Light Project" of the Chinese Academy of Sciences ; "Western Light Project" of the Chinese Academy of Sciences ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; State Key Laboratory of Organic Geochemistry ; State Key Laboratory of Organic Geochemistry ; "Western Light Project" of the Chinese Academy of Sciences ; "Western Light Project" of the Chinese Academy of Sciences ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; State Key Laboratory of Organic Geochemistry ; State Key Laboratory of Organic Geochemistry ; "Western Light Project" of the Chinese Academy of Sciences ; "Western Light Project" of the Chinese Academy of Sciences ; National Nature Science Foundation of China ; National Nature Science Foundation of China ; State Key Laboratory of Organic Geochemistry ; State Key Laboratory of Organic Geochemistry ; "Western Light Project" of the Chinese Academy of Sciences ; "Western Light Project" of the Chinese Academy of Sciences
源URL[http://ir.iggcas.ac.cn/handle/132A11/101208]  
专题地质与地球物理研究所_兰州油气中心
地质与地球物理研究所_中国科学院油气资源研究重点实验室
通讯作者Wang, Xiaofeng
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Petr Resources Res, Beijing 100029, Peoples R China
2.Res Inst Shaanxi Yanchang Petr Grp Co Ltd, Xian 710075, Peoples R China
3.Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Petr Resources, Lanzhou 730000, Gansu, Peoples R China
4.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China
5.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, 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]. MARINE AND PETROLEUM GEOLOGY,2021,128:12.
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,128,12.
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):12.

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来源：地质与地球物理研究所

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