Molecular transformations of heteroatomic organic compounds in crude oils caused by biodegradation and subsequent thermal maturation: Insights from ESI FT-ICR MS
文献类型：期刊论文
| 作者 | Jiang, Bin1,2; Liu, Weimin1,2; Liao, Yuhong1,2,3; Peng, Ping'an1,2,3 |
| 刊名 | ORGANIC GEOCHEMISTRY
 |
| 出版日期 | 2024-02-01 |
| 卷号 | 188页码:14 |
| 关键词 | Biodegradation Thermal maturation Secondary alteration FT-ICR MS Superimposed basin |
| ISSN号 | 0146-6380 |
| DOI | 10.1016/j.orggeochem.2024.104741 |
| 英文摘要 | The Tarim and Junggar basins are major petroliferous sedimentary deposits in China. Some oil reservoirs in these basins experienced superimposed secondary alterations including early biodegradation followed by thermal maturation/alteration (SSA-B&M). Heteroatomic polar organic compounds in crude oil are significantly influenced by SSA-B&M, which play a vital role in understanding the evolutionary history of oil reservoir. However, research on such alterations is limited. The present study employed negative and positive ion electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI FT-ICR MS) to investigate the molecular transformations of heteroatomic organic compounds in crude oils resulting from SSA-B&M. The findings indicate that biodegradation leads to an enrichment of naphthenic acids, while subsequent cyclization, aromatization and thermal cracking reactions enhances the aromaticity of the pyrolysis products of all the oil samples with varying degree of biodegradation. Notably, highest aromaticity was observed for the crude oil that has been most severely altered by biodegradation. During early and moderate stages of biodegradation, the abundances of O2 compounds (molecules contain two oxygen atoms) representing carboxylic acids were continuously increasing. However, at severe biodegradation levels, fatty acids with 1 double bond equivalents (DBE) underwent degradation, while the naphthenic acids were further enriched. Subsequently, during maturation, O2 compounds with 1 to 5 DBE experienced a steady decline in abundance. The naphthenic acids mainly experienced aromatization, while the fatty acids were partly decarboxylized and cracked thereby forming new nalkanes. Biodegradation led to modification in neutral nitrogen compounds with 3 to 4 condensed rings (DBE = 9-12) and long alkyl side chains, while the impact on basic nitrogen compounds was relatively minimal. After subsequent thermal maturation, both neutral and basic nitrogen compounds with long alkyl side chains underwent cracking, while those with shorter alkyl side chains and higher degrees of condensation tended to remain relatively unchanged. Finally, two new indices were defined and tested to correctly evaluate the maturation and biodegradation level for crude oils that have experienced SSA-B&M. |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001168655600001 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/77358]  |
| 专题 | 有机地球化学国家重点实验室 |
| 通讯作者 | Liao, Yuhong |
| 作者单位 | 1.Guangzhou Inst Geochem, Chinese Acad Sci, State Key Lab Organ Geochem, Guangzhou 510640, Peoples R China 2.CAS Ctr Excellence Deep Earth Sci, Guangzhou 510640, Peoples R China 3.Univ Chinese Acad Sci, Yuquan Rd, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Jiang, Bin,Liu, Weimin,Liao, Yuhong,et al. Molecular transformations of heteroatomic organic compounds in crude oils caused by biodegradation and subsequent thermal maturation: Insights from ESI FT-ICR MS[J]. ORGANIC GEOCHEMISTRY,2024,188:14. |
| APA | Jiang, Bin,Liu, Weimin,Liao, Yuhong,&Peng, Ping'an.(2024).Molecular transformations of heteroatomic organic compounds in crude oils caused by biodegradation and subsequent thermal maturation: Insights from ESI FT-ICR MS.ORGANIC GEOCHEMISTRY,188,14. |
| MLA | Jiang, Bin,et al."Molecular transformations of heteroatomic organic compounds in crude oils caused by biodegradation and subsequent thermal maturation: Insights from ESI FT-ICR MS".ORGANIC GEOCHEMISTRY 188(2024):14. |
入库方式： OAI收割
来源：广州地球化学研究所
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