Academic Journal
Influence of thermal maturity on carbazole distributions in coal source rocks during compaction pyrolysis experiments
| Title: | Influence of thermal maturity on carbazole distributions in coal source rocks during compaction pyrolysis experiments |
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| Authors: | Jian Bao, Yan Liu, Yunpeng Fan, Yaohui Xu, Kangle Ding, Zhigang Wen, Yang Li, Ye Gao, Cunyang Zhang, Lu Li |
| Source: | Scientific Reports, Vol 14, Iss 1, Pp 1-16 (2024) |
| Publisher Information: | Nature Portfolio, 2024. |
| Publication Year: | 2024 |
| Collection: | LCC:Medicine LCC:Science |
| Subject Terms: | Carbazole compounds, Thermal maturity, Coal, Compaction pyrolysis experiment, Hydrocarbon migration, Medicine, Science |
| More Details: | Abstract Carbazole compounds are widely used in determining the direction of petroleum migration, but the effect of thermal maturity on carbazoles is still ambiguity. In this paper, using compaction pyrolysis simulation experiments, artificial mature samples with vitrinite reflectance (R o ) range from 0.38 to 3.0% were acquired. And the content and composition change characteristics of carbazole compounds were analyzed in coal source rocks. The experimental results showed that thermal maturity controls the generation of a large amount of carbazole compounds in coal rocks. Compared with the low mature stage, the content of carbazole compounds was about 10–100 times higher in the mature stage. With the increasing maturity, in the coal sample, the content of carbazole compounds showed a trend of first increasing and then decreasing. In derivatives of carbazole, the corresponding maturity for the maximum generation of ethylcarbazole (EC), dimethylcarbazole (DMCA), methylcarbazole (MCA), carbazole (CA) and benzocarbazole (BCA) performed the increasing sequence. With the increasing maturity, the relative abundance of 2-MCA, 1,7-DMCA and benzo[a]carbazole increased with the increasing maturity, while 4-MCA, 1,4-DMCA and benzo[c]carbazole gradually decreased. Benzocarbazole ratio [a]/[a] +[ c] varies only in a narrow range 0.36–0.61 in the entire maturity range, suggesting limited maturity dependence. The experimental conclusion provides more theoretical basis for future geochemical analysis using carbazole compounds. |
| Document Type: | article |
| File Description: | electronic resource |
| Language: | English |
| ISSN: | 2045-2322 |
| Relation: | https://doaj.org/toc/2045-2322 |
| DOI: | 10.1038/s41598-024-57520-1 |
| Access URL: | https://doaj.org/article/cd3c49e8158b44b5af1928d1e571e6d0 |
| Accession Number: | edsdoj.3c49e8158b44b5af1928d1e571e6d0 |
| Database: | Directory of Open Access Journals |
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| ISSN: | 20452322 |
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| DOI: | 10.1038/s41598-024-57520-1 |
| Published in: | Scientific Reports |
| Language: | English |