New biodegradation degree proxies based on acids and neutral nitrogen- and oxygen-containing compounds characterized by high resolution mass spectrometry

Wang, Dongyong; Li, Meijun; Deng, Cheng; Du, Yebo; Shi, Quan; Zou, Xianli; Chen, Qingyao

doi:10.1016/j.fuel.2023.128438

Cited by 4 publications

(3 citation statements)

References 81 publications

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“…The main reasons are as follows: Biodegradation has the ability to selectively alter the isomers of tracer biomarkers with different levels of thermal stability, thereby influencing the analysis of oil migration pathways according to maturity levels. Notably, regular steranes follow the order of depletion: ααα 20R > αββ 20R > αββ 20S ≥ ααα 20S; The process of biodegradation can result in varying degrees of alteration for tracer biomarkers with different polarities, thus complicating the interpretation of oil migration pathways based on geochromatographic effects. − Considerable evidence suggest that the position of the alkyl substituent on the aromatic ring of typical tracers for oil migration direction, particularly heteroaromatic compounds such as pyrrole − and thiophene ring compounds, ,, can affect their susceptibility to biodegradation . In particular, biodegradation is more likely to occur in pyrrole and thiophene ring isomers that are either shielded or partially shielded than those that are exposed …”

Section: Introductionmentioning

confidence: 99%

“…The process of biodegradation can result in varying degrees of alteration for tracer biomarkers with different polarities, thus complicating the interpretation of oil migration pathways based on geochromatographic effects. − Considerable evidence suggest that the position of the alkyl substituent on the aromatic ring of typical tracers for oil migration direction, particularly heteroaromatic compounds such as pyrrole − and thiophene ring compounds, ,, can affect their susceptibility to biodegradation . In particular, biodegradation is more likely to occur in pyrrole and thiophene ring isomers that are either shielded or partially shielded than those that are exposed …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A Novel Approach for Investigating the Paleo-Oil Filling Orientations: Constraints by Biodegradation Evaluation Proxies and Recovered Biomarker Parameters

Shi,

Chang,

Liu

et al. 2024

Energy Fuels

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The spatial arrangement of methyl groups in biomarkers significantly impacts their polarity and thermal stability, both of which are crucial for the chromatographic effects involved in tracing the direction of oil migration. However, biodegradation can also selectively alter the isomers of these biomarkers based on the positions of their methyl groups, making it challenging to interpret migration directions in biodegraded oils using conventional tracers. Hence, it is imperative to explore novel indicators, such as the biodegradation evaluation parameter, in order to discern the directions of oil migration. However, conventional proxies for evaluating biodegradation, such as C 29 25-nor-hopane/ C 30 Hopane (25-NH/H), C 22 17-nor-tricyclic terpane/C 23 tricyclic terpane (17-NT/TT), and the widely used modular analysis and numerical classification of oils (Manco) scale, often have limited applicability and resolution within a narrow range of biodegradation, particularly in long-distance migration scenarios. To address this issue and improve resolution across a broader spectrum of biodegraded oils, we developed a refined approach. This approach uses five homologues, each displaying different levels of resistance to biodegradation, to cover the complete range of biodegradation. Our novel approach provides significantly improved resolution compared to the conventional Manco scale, and our goal is to employ the contour plots generated by this approach to accurately determine the migration direction. To verify the accuracy of our results, we conducted validation experiments using conventional tracers. Our validation experiments included measurements of isomer ratios of pyrrolic and thiophene ring compounds, as well as typical biomarker tracers recovered from the biogenetic information derived from biodegraded oils, specifically (C 23 TT+C 22 17-NT)/(C 30 H+C 29 25-NH). Furthermore, we examined structural morphology, density and viscosity, the quantitative grain fluorescence index, the hydrocarbon migration effective pathway index (Hmle), and porepermeability characteristics for further validation purposes. This refined scale for evaluating biodegradation provides comprehensive insights into biodegraded oils and serves as an essential tool for understanding patterns of hydrocarbon preferential migration and identifying promising exploration targets for biodegraded oils in both the studied regions and elsewhere.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Novel Approach for Investigating the Paleo-Oil Filling Orientations: Constraints by Biodegradation Evaluation Proxies and Recovered Biomarker Parameters

Shi,

Chang,

Liu

et al. 2024

Energy Fuels

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show abstract

“…Therefore, carbazole compounds are commonly used as indicators of oil and gas transport, it has been widely used in petroleum geochemical research in the past 20 years [5][6][7][8][9][10][11]. However, the abundance and relative composition of nitrogen-containing compounds in crude oil are not only affected by the migration fractionation effect, but also by various factors such as sedimentary facies and environment [12][13][14][15], thermal maturity [16][17][18][19][20][21][22][23][24][25] and biodegradation [26][27][28][29][30][31]. The understanding of the effect of thermal maturity on the content changes of carbazoles is still controversial.…”

Section: Introductionmentioning

confidence: 99%

Effect of thermal maturity on carbazole distributions: insights from compaction pyrolysis experiment of coal

Bao,

Liu,

Fan

et al. 2023

Preprint

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Carbazole compounds are widely used in determining the direction of hydrocarbon migration, but the effect of thermal maturity on carbazoles remains unclear. In this paper, using compaction pyrolysis simulation experiments, artificial mature samples with vitrinite reflectance (Ro) range from 0.38–3.0% were acquired. And the content and composition change characteristics of carbazole compounds were analyzed. The results showed that thermal maturity had a significant influence on the content of carbazole compounds. Compared with the low mature stage, the content of carbazole compounds was about 10 to 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. The formation of carbazole compounds was later than generation of hydrocarbon, suggesting carbazoles mainly produced by the thermal degradation of kerogen. 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. The timing of reaching the maximum content of carbazole compounds is related to the number and type of substituents. The more substituents and longer branches result earlier formation peak. With the increasing maturity, the relative abundance of 2-MCA, 1,7-DMCA and benzo[a]carbazole increased with the increasing maturity, the relative abundance of 1,5-DMCA remained almost unchanged, while 4-MCA, 1,4-DMCA and benzo[c]carbazole gradually decreased. The commonly used parameters as indicators of hydrocarbon migration were greatly affected by maturity. Therefore, when using carbazole compounds as geochemical parameters, it is necessary to fully consider the impact of thermal maturity on them, and avoid transport fractionation or other factors masking the true maturity effect.

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A new ternary diagram to decipher the evolution of maturity and biodegradation of crude oil using ESI FT-ICR MS

Wang,

Li,

Chen

et al. 2024

Fuel

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New biodegradation degree proxies based on acids and neutral nitrogen- and oxygen-containing compounds characterized by high resolution mass spectrometry

Cited by 4 publications

References 81 publications

A Novel Approach for Investigating the Paleo-Oil Filling Orientations: Constraints by Biodegradation Evaluation Proxies and Recovered Biomarker Parameters

A Novel Approach for Investigating the Paleo-Oil Filling Orientations: Constraints by Biodegradation Evaluation Proxies and Recovered Biomarker Parameters

Effect of thermal maturity on carbazole distributions: insights from compaction pyrolysis experiment of coal

A new ternary diagram to decipher the evolution of maturity and biodegradation of crude oil using ESI FT-ICR MS

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