Use of biomarkers, porphyrins, and trace elements to assess the origin, maturity, biodegradation, and migration of Alturitas oils in Venezuela

Escobar, Marcos; Márquez, G.; Azuaje, Vicmar; silva, A. Da; Tocco, R.

doi:10.1016/j.fuel.2012.03.002

Cited by 16 publications

(8 citation statements)

References 31 publications

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“…The same correlation can be seen in Figure 2 geochemical ratios obtained from terpane and sterane biomarkers were calculated. The terpane and sterane biomarkers were identified from the GC/MS data in SIM mode using theoretical references 7,8,[10][11][12]34,35 and retention indexes described previously by Hwang 36 and Oudot and co-workers. 37 Energy & Fuels From the identification of terpane and sterane biomarkers in Figures 3 and 4, it was therefore possible to estimate the levels of thermal evolution and depositional environment of such crude oils (Table 2).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Characterization of less polar biomarkers (mostly of the n -alkane, isoprenoid, hopane, and sterane classes) has been used extensively in geochemistry studies to infer crude oil characteristics, such as oil–oil and oil–reservoir correlations, origin, age, maturity, depositional environments, and degree of biodegradation. − Gas chromatography/mass spectrometry (GC/MS) and comprehensive two-dimensional gas chromatography (GC × GC) coupled to mass spectrometry (MS) have been the major techniques used for biomarker screening in crude oils. Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) coupled with electrospray ionization (ESI) has been used to characterize the most acidic and basic polar constituents in crude oils.…”

Section: Introductionmentioning

confidence: 99%

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Advanced Aspects of Crude Oils Correlating Data of Classical Biomarkers and Mass Spectrometry Petroleomics

Santos

Eberlin

et al. 2017

Energy Fuels

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The complex geochemical characteristics of crude oils can provide important information on oil generation, such as the input of organic matter and their depositional environments, also supporting exploration, extraction, and production. This work reports the first organic geochemical evaluation of oils from the first commercial Brazilian onshore field (Carmoṕolis, Sergipe, Brazil) via both classical biomarkers and petroleomics data collected via ultrahigh-resolution and accuracy Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). Gas chromatography/mass spectrometry (GC/MS) was used to characterize the oil composition in terms of n-alkane, isoprenoid, terpane, and sterane biomarkers, whereas either positive or negative electrospray ionization (ESI) and FT-ICR were used to profile the polar constituents of the oils. GC/MS revealed geochemical characteristics that classify the oil at different levels of thermal evolution and biodegradation. FT-ICR MS attributed molecular formulas to more than 3000 polar oil constituents, allowing geochemical parameters to be inferred mainly from the carbon number (Cn) and double bond equivalent (DBE) trends, along with the N and O 2 classes. The Dia27(S + R)/αααC 27 (S + R), % C 28 , and % C 29 parameters and S/(S + R)αααC 29 , αββ(S + R)/αββ + ααα(S + R)C 29 , and % C 27 biomarkers obtained from GC/MS were responsible to indicate similarity between samples, whereas N and O 2 classes provided the most distinction among the crude oil blends in terms of the level of biodegradation and thermal maturity.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Advanced Aspects of Crude Oils Correlating Data of Classical Biomarkers and Mass Spectrometry Petroleomics

Santos

Eberlin

et al. 2017

Energy Fuels

View full text Add to dashboard Cite

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“…The exceptions were oil C and samples 2, where C 27 was the major regular sterane, characteristic of predominantly marine organic matter input. In comparison with the Venezuelan oils, all the samples had a greater relative abundance of C 27 , compared to the other regular steranes, suggesting that all the samples (not just oil C and samples 2) had predominantly marine organic matter inputs (Escobar et al 2012, López & Mónaco 2017.…”

Section: Biomarkers: Organic Matter Type and Sedimentation Environmentmentioning

confidence: 93%

Multiple reaction monitoring tool applied in the geochemical investigation of a mysterious oil spill in northeast Brazil

Carregosa

Santos

Sá

et al. 2021

An. Acad. Bras. Ciênc.

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In 2019, much of the northeastern coast of Brazil was impacted by a mysterious oil spill that caused an environmental disaster affecting 1009 beaches. Four samples were collected in the beaches between Sergipe and Pernambuco for geochemical characterization of the spilled oil and to compare with those main produced in Sergipe-Alagoas basin. Our approach in this evaluation was the use of a highly selective technique of sequential mass spectrometry by multiple reaction monitoring, to obtain the diagnostic ratios of hopanes and steranes biomarkers. Using these biomarkers ratios associated with multivariate statistical analysis, we found direct correlation between the spilled oil collected along the northeastern coast and no relationship between Sergipe-Alagoas basin crude oils was found. Furthermore, reported data for oils from Orinoco belt in Venezuelan basins were used for qualitative evaluation considering the indicative aspects suggested by the literature. Presence of highly specifi c biomarker 18α(H)-oleanane, and fi ve other important diagnostic ratios evidenced correlation between the spilled oil and Naricual formation crude oils. Besides, due to the oleanane index, Ayacucho's crude oil presented the strongest factor of correlation with the spilled oil found on the northeast coast of Brazil.

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“…Gas chromatography (GC) with flame ionization detector (GC-FID) or coupled with mass spectrometry (GC/MS) is one of the traditional techniques that have played an important role in the development of methods to study the chemical composition of crude oils. Although cold-EI GC/MS is a new and extremely interesting method, , gas chromatography has some limits when it comes to the analysis of very polar or heavy and highly aromatic components with a molecular weight much higher than 400 Da. ,− To counter these limitations, ultrahigh-resolution mass spectrometry (UHRMS) by Fourier transform ion cyclotron resonance (FT-ICR MS) or Orbitrap mass analyzers has been successfully applied to characterize medium to highly polar compounds, as well as heavy components in crude oils and its derivatives down to the molecular level. − It has been demonstrated that, due to different ionization characteristics and discrimination effects, using different ionization sources, such as electrospray ionization (ESI) and atmospheric pressure photoionization (APPI), together with UHRMS is important to obtain a more complete chemical characterization of crude oils. − …”

Section: Introductionmentioning

confidence: 99%

Modified SARA Method to Unravel the Complexity of Resin Fraction(s) in Crude Oil

et al. 2020

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The complexity of crude oil samples has hindered its detailed analysis and understanding. Although modern analytical methods such as ultrahigh-resolution mass spectrometry have opened the understanding of the molecular composition, discrimination due to the complexity is sabotaging a better understanding. Therefore, the SARA fractionation has been used to reduce complexity by adding a fractionation step prior to analysis. However, our studies indicate that the conventional combinations of solvents used for SARA fractionation are inefficient for the elution of heavier fractions of crude oil from the alumina stationary phase. Adding an additional step to the conventional SARA scheme provides a second resin fraction using ethyl acetate as an additional mobile phase and provides a new material that has not yet been reported. For a better understanding of the differences between both resin fractions, detailed studies have been carried out utilizing ultrahigh-resolution mass spectrometry with different types of ionization methods, one of the best scenarios to reduce discrimination and suppression effects.

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Use of biomarkers, porphyrins, and trace elements to assess the origin, maturity, biodegradation, and migration of Alturitas oils in Venezuela

Cited by 16 publications

References 31 publications

Advanced Aspects of Crude Oils Correlating Data of Classical Biomarkers and Mass Spectrometry Petroleomics

Advanced Aspects of Crude Oils Correlating Data of Classical Biomarkers and Mass Spectrometry Petroleomics

Multiple reaction monitoring tool applied in the geochemical investigation of a mysterious oil spill in northeast Brazil

Modified SARA Method to Unravel the Complexity of Resin Fraction(s) in Crude Oil

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