Fractionation of pyrrolic nitrogen compounds in petroleum during migration: derivation of migration-related geochemical parameters

Li, Maowen; Larter, Stephen R.; Stoddart, Daniel; Bjorøy, Malvin

doi:10.1144/gsl.sp.1995.086.01.09

Cited by 102 publications

(92 citation statements)

References 43 publications

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“…Previously it was reported that immature (~ 0.5% R o ) and mature (~ 0.8% R o ) Lower Keg River carbonates as well as Posidonia Shale samples of different maturity (0.48-1.45% R o ) could be discriminated in this plot (Clegg et al, , 1998b. Furthermore, Li et al (1995) had earlier shown that even stronger variations of the methylcarbazoles occurred in a data set based on a much broader selection of crude oil and source rock samples. It may be concluded that the methylcarbazoles are well suited for the differentiation of Abu Gharadig and Shushan crude oils with respect to geographical origin and variations of facies and depositional environment.…”

Section: Compositions Of Carbazolesmentioning

confidence: 80%

“…As for the Shushan oils, 4-methylcarbazole is the most abundant and 3-methylcarbazole is the least abundant methylcarbazole. In the work of Dorbon et al (1984) on crude oils and Li et al (1995) for source rocks, it was reported that 4-methylcarbazole is the most abundant and 1-methylcarbazole is the least abundant methylcarbazole.…”

Section: Compositions Of Carbazolesmentioning

confidence: 99%

“…Triangular diagrams have been used previously to evaluate variations of the alkylcarbazoles (Li et al, 1995;Clegg et al, 1997Clegg et al, , 1998aHorsfield et al, 1998). The distributions of the methylcarbazoles, 1-, 3+2-, and 4-are shown in a ternary plot after Li et al (1995) (Fig.…”

Section: Compositions Of Carbazolesmentioning

confidence: 99%

“…The distributions of the methylcarbazoles, 1-, 3+2-, and 4-are shown in a ternary plot after Li et al (1995) (Fig. 4A).…”

Section: Compositions Of Carbazolesmentioning

confidence: 99%

“…In a study by Li et al (1995) several crude oils from marine, freshwater and brackish-brine lacustrine to swampy lake environments revealed no characteristic pyrrolic nitrogen compound distributions that could be assigned to any given depositional conditions. In crude oils of the Rainbow Shekilie-Zamma subbasins of NW Alberta (Canada), the saturated and aromatic hydrocarbon distributions responded to variations in thermal maturity and depositional conditions, whereas pyrrolic nitrogen compounds did not respond to the same extent (Li et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

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Occurrence and Geochemical Significance of Carbazoles and Xanthones in Crude Oil from the Western Desert, Egypt

Bakr¹

2009

ear

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Abstract. This paper describes an approach that involves the evaluation of the occurrence and distributions of nitrogen-and oxygen-containing aromatic compounds in Egyptian crude oils and source rocks. Carbazoles and xanthones represent nitrogen-and oxygen-containing aromatic compounds, respectively.Alkylcarbazoles and benzocarbazoles were quantitatively studied in crude oils taken from the Abu Gharadig and Shushan basins in north Western Desert of Egypt in order to investigate their occurrence, concentrations and distributions. The abundances of carbazole, methylcarbazoles and dimethylcarbazoles in the marine Abu Gharadig oils are much higher than that of the terrestrial Shushan oils. The results presented here indicate that thermal maturation can be ruled out as a major factor in controlling the changes in the carbazole ratios in the crude oils. Most likely, source characteristics of the studied samples play a significant role in controlling the distribution of carbazole compounds in reservoired oils. The alkylcarbazoles 1MC/1MC+1EC, 3MC/4MC and 18DMC/18DMC+1EC when correlated with specific biomarker signatures provide background information discriminating between two main types of depositional setting: 1) Terrestrial dominated source deposited in oxidizing conditions for the Shushan oils and, 2) marine shale dominated sourced oils deposited in suboxic environments for the Abu Gharadig samples. Similarly, benzocarbazole distributions were found to be independent of maturity, but influenced by organic facies and depositional environments. Therefore, in this study, alkylcarbazole and benzocarbazoles compounds are well suited for the differentiation of Abu Gharadig and Shushan crude oils with respect to origin and variations of facies and depositional environment. M.M.Y. Bakr 128Using various kinds of Egyptian crude oils derived from marine carbonates, marine clastics and terrestrial sources, the current study indicates that xanthones and its alkylated homologues are abundant only in source extracts and crude oils that have terrestrial organic matter input. This is the second description of xanthones in crude oils, and the first in Egyptian petroleum systems. Overall, based on the data of this study, xanthones signatures show great promise as terrestrial source markers in a given petroleum system.

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Section: Compositions Of Carbazolesmentioning

confidence: 80%

Section: Compositions Of Carbazolesmentioning

confidence: 99%

Section: Compositions Of Carbazolesmentioning

confidence: 99%

“…The distributions of the methylcarbazoles, 1-, 3+2-, and 4-are shown in a ternary plot after Li et al (1995) (Fig. 4A).…”

Section: Compositions Of Carbazolesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Occurrence and Geochemical Significance of Carbazoles and Xanthones in Crude Oil from the Western Desert, Egypt

Bakr¹

2009

ear

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Palladium‐Catalyzed Synthesis of Alkylcarbazoles and Their Identification in Petroleum and Source Rocks**

et al. 2022

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We describe the synthesis of seven C2‐alkylcarbazoles via a sequence of Buchwald–Hartwig coupling of arylamines with aryl halides followed by oxidative cyclization of the resulting diarylamines. Methyl groups at the positions 4 and 5 were introduced by taking advantage of the ortho‐directed palladation of meta‐pivaloyloxy‐substituted diarylamines and subsequent conversion of the pivaloyloxy to methyl groups through Stille coupling of intermediate triflates. The obtained ethyl‐ and dimethylcarbazoles served as analytical standards for their identification in petroleum samples and source rocks.

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Study on secondary migration of hydrocarbons in Tazhong area of Tarim Basin in terms of carbazole compounds

Liu

Kang

1999

Chin. J. Geochem.

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Fractionation of pyrrolic nitrogen compounds in petroleum during migration: derivation of migration-related geochemical parameters

Cited by 102 publications

References 43 publications

Occurrence and Geochemical Significance of Carbazoles and Xanthones in Crude Oil from the Western Desert, Egypt

Occurrence and Geochemical Significance of Carbazoles and Xanthones in Crude Oil from the Western Desert, Egypt

Palladium‐Catalyzed Synthesis of Alkylcarbazoles and Their Identification in Petroleum and Source Rocks**

Study on secondary migration of hydrocarbons in Tazhong area of Tarim Basin in terms of carbazole compounds

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