The effects of biodegradation on the compositions of aromatic hydrocarbons and maturity indicators in biodegraded oils from Liaohe Basin

Bao, Jianping; Zhu, Chen

doi:10.1007/s11430-009-5017-5

Cited by 14 publications

(4 citation statements)

References 19 publications

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“…The serious biodegradation for some oils may also lead to the great variations of FLs, DBTs and DBTs composition. Bao and Zhu (2009) reported that DBT/PHEN ratios increase with the increasing degree of biodegradation of crude oils in the Western Depression. Therefore, the influence of biodegradation can not be excluded.…”

Section: The Application Of Ternary Diagram Of Fls Dbts and Dbfs In mentioning

confidence: 99%

Ternary Diagram of Fluorenes, Dibenzothiophenes and Dibenzofurans: Indicating Depositional Environment of Crude Oil Source Rocks

Wang

Zhong

et al. 2013

Energy Exploration & Exploitation

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Fluorene (FL), dibenzothiophene (DBT) and dibenzofuran (DBF) and their alkylated homologues are important polycyclic aromatic compounds in crude oils and source rock extracts. They share the similar chemical structure and may have genetic relationships. The parent compounds (unsubstituted), methyl-, dimethyl- and ethyl-substituted isomers are identified by comparison with retention indices reported in literatures and correlation with co-injection of internal standards in gas chromatography-mass spectrometry (GC-MS) analysis. Therefore, their relative concentrations can be determined. Based on the large data sets, this paper preliminarily establishes a ternary diagram to interpret the depositional environment/lithology for oils and related source rocks. Five typical depositional environments/lithologies are distinguished on this ternary diagram. Data points from typical marine carbonate, fluvial/deltaic/fresh lacustrine shale and swamp fall into the DBTs, FLs and DBFs end-members, respectively. Oils from marine shale have subequal contents of FLs and DBFs and lie between the zones of fluvial/deltaic/fresh lacustrine shale and swamp, but have a little higher abundance of DBTs. The oils from brackish/saline lacustrine have intermediate contents of DBTs with a wide variety and some degree overlap with that of marine shale. On the basis of the ternary diagrams, two petroleum systems in the cratonic region of the Tarim basis are defined. The majority of discovered oils were derived from the Middle-Upper Ordovician carbonate source rocks. Whereas, some oils from wells TD2, T904, LK1 and TZ62 originated from the Cambrian and Lower Ordovician source rocks. Therefore, the ternary diagram of FLs, DBTs and DBFs is a useful method to interpret depositional environment/lithology for oils and related source rocks and to definite petroleum systems as well.

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Section: The Application Of Ternary Diagram Of Fls Dbts and Dbfs In mentioning

confidence: 99%

Ternary Diagram of Fluorenes, Dibenzothiophenes and Dibenzofurans: Indicating Depositional Environment of Crude Oil Source Rocks

Wang

Zhong

et al. 2013

Energy Exploration & Exploitation

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“…In the two-ring naphthalene series ( Figure 3 ), as the number of methyl substituents increased from 0 to 5, the effect of illite varied from inhibition (0, 1, 2) to stimulation (3, 4) and then, to inhibition (5) ( Figure S9 ). In general, with an increase in the number of methyl substituents, the steric hindrance, stability, and biodegradation resistance of naphthalene series compounds increase [ 64 , 65 , 66 , 67 ]. However, the effect of illite on the biodegradation of naphthalene series compounds was not consistent with this rule, and this phenomenon of altered influence with the increase in the methyl substitution number of naphthalene series was also exhibited by Mon [ 36 ] ( Figure S14 ).…”

Section: Resultsmentioning

confidence: 99%

Interaction between Illite and a Pseudomonas stutzeri-Heavy Oil Biodegradation Complex

Wan

et al. 2023

Microorganisms

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Illite is a widely distributed clay mineral with huge reserves in Earth’s crust, but its effect on heavy oil biodegradation is rarely reported. This study made an investigation of the interactions between illite and a Pseudomonas stutzeri-heavy oil complex (PstHO). Results showed that, although illite exerted a negative effect on P. stutzeri degrading heavy oil by inhibiting the biodegradation of 64 saturated hydrocarbons (SHs) and 50 aromatic hydrocarbons (AHs), it selectively stimulated the biodegradation of 45 AHs with a specific structure, and its biogenic kaolinization at room temperature (35 °C) and pressure (1 atm) was observed in PstHO for the first time. The finding points out for the first time that, in PstHO, illite may change the quasi-sequential of AHs biodegradation of heavy oil, as well as its kaolinization without clay intermediate.

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“…PAHs have been applied as molecular maturity parameters on the basis of the different thermodynamic stabilities of individual isomers, − for example, MDR = 4-methylDBT/1-methylDBT, DMDBTI = (4,6-+2,4-DMDBT)/(1,4-+1,6+1,8-+4,6-+2,4-DMDBT), TMDBTI = 2,4,6-TMDBT/(2,4,7-+2,4,8-TMDBT), MCI1 = 1.5 × (2-MChy + 3-MChy)/(chrysene + 1-MChy + 4-MChy + 5-MChy + 6-MChy), MPYR [2-MPy/(2-MPy + 1-MPy)], TAS = (C 20 + C 21 triaromatic steroids)/(C 20 + C 21 + C 26 + C 27 + C 28 triaromatic steroids), C 28 TAS = C 28 triaromatic steroid 20S/(20S + 20R) . In addition, PAHs are also applied to oil–oil/source rock correlation, depositional environment reconstruction, and oil migration pathway tracing. ,− For example, it is well accepted that the relative abundance of dibenzothiophenes is largely controlled by depositional conditions, and it can serve as a good indicator to distinguish depositional environments and correlate oils . However, secondary alteration processes, such as biodegradation and water washing, can also change the content and composition of PAHs in crude oils, resulting in the failure of geochemical indicators.…”

Section: Introductionmentioning

confidence: 99%

Biodegradation of Polycyclic Aromatic Hydrocarbons: A Case Study of the Chepaizi Uplift, Junggar Basin, NW China

Chen

Yang

Jin

et al. 2023

ACS Earth Space Chem.

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Polycyclic aromatic hydrocarbons (PAHs) are important components in crude oil with extensive applications in maturity assessment, depositional environment reconstruction, and oil−oil/source rock correlation. The biodegradation of oils is common under geological conditions. Despite many studies on the biodegradation of saturated hydrocarbons, naphthalenes, and phenanthrenes, the relative susceptibilities to biodegradation of fluorene, dibenzothiophene, chrysene, pyrene and their alkylated homologues, and triaromatic steroid hydrocarbons were not well studied. In this study, a suite of oils and oil sands from the Chepaizi Uplift, Junggar Basin, were collected to investigate the fate and relative susceptibilities to the biodegradation of these PAHs under geological conditions. Gas chromatography−mass spectrometry analysis was conducted to identify the aromatic species. Based on the studied samples with different biodegradation levels, the relative susceptibilities of individual dibenzothiophene, fluorene, chrysene, and pyrene and their alkylated homologues and triaromatic steroid hydrocarbons were determined. DBT/1-MDBT, 3,7-/2,4-DMDBT, 1,2,7-+1,2,8-/2,4,6-TMDBT, 1-MF/4-MF, 1,6-DMF/B, Py/4-MPy, and C 26 20S TAS/C 27 20R TAS were proposed to assess the biodegradation. The biodegradation order is not related to thermodynamic stability, making the maturity assessment of biodegraded oils and oil sands more difficult. Moreover, most PAH-based parameters used for oil−oil/source rock correlation and depositional environment analysis are not available due to biodegradation. Maturity parameters, such as MCI1, MCI2, and MChyI2, increase with increasing biodegradation, while MDR and DMDBTI decrease with increasing biodegradation. However, the refractory C 26 −C 28 triaromatic steroids are valid before PM 8. Therefore, using PAH-based parameters in the geochemical assessment of in-reservoir biodegraded or oil sands should be done with care, and the relative biodegradation susceptibilities of related components should be taken into consideration.

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The effects of biodegradation on the compositions of aromatic hydrocarbons and maturity indicators in biodegraded oils from Liaohe Basin

Cited by 14 publications

References 19 publications

Ternary Diagram of Fluorenes, Dibenzothiophenes and Dibenzofurans: Indicating Depositional Environment of Crude Oil Source Rocks

Ternary Diagram of Fluorenes, Dibenzothiophenes and Dibenzofurans: Indicating Depositional Environment of Crude Oil Source Rocks

Interaction between Illite and a Pseudomonas stutzeri-Heavy Oil Biodegradation Complex

Biodegradation of Polycyclic Aromatic Hydrocarbons: A Case Study of the Chepaizi Uplift, Junggar Basin, NW China

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