The retention of precursor biotic signatures in the organonitrogen and organooxygen compounds of immature fine-grained sedimentary rocks

Yue, Huiwen; Vieth‐Hillebrand, Andrea; Yang, Shengyu; Schulz, Hans-Martin; Horsfield, Brian; Poetz, Stefanie

doi:10.1016/j.coal.2022.104039

Cited by 4 publications

(2 citation statements)

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“…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%

“…Hallmann et al [32] studied the distribution of carbazoles in raw oil in Gidgealpa oil eld, and believed that the distribution of benzocarbazole has no relationship with lithofacies, organic facies and maturity, but the composition of alkyl carbazole has obvious correlation with lithofacies and organic facies. There are also studies that the effect of thermal maturity is very signi cant [15,18,19,20,21,23,24,25]. For example, the study of carbazoles in the extracts of marine carbonate rocks with %R o range of 0.45-1.30% by Li et al showed that the total concentration of carbazoles and benzo[a]carbazole/(benzo[a]carbazole + benzo[c]carbazole) all increase with the increasing of maturity within a certain maturity range [17].…”

Section: Introductionmentioning

confidence: 99%

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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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