Alkylbiphenyls in ancient sediments and petroleums

Alexander, Robert; Cumbers, K.M.; Kagi, Robert I.

doi:10.1016/s0146-6380(86)80021-3

Cited by 47 publications

(13 citation statements)

References 12 publications

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“…The separation methods of saturated and aromatic hydrocarbons, resins, and asphaltenes are the same as those in the study by Li et al Gas chromatography–mass spectrometry (GC–MS) analysis was performed on an Agilent 5975C MSD system interfaced to an Agilent 7890A gas chromatograph. GC–MS settings are the same as those in the study by Li et al Identification of all MBP, EBP, DMBP, and alkyldiphenylmethanes were based on comparison of their relative retention time to reported literature data. ,,, The structures and numbering of alkylbiphenyl (I) and alkyldiphenylmethane (II) are shown in Appendix A of the Supporting Information. Phenanthrene- d 10 , an internal standard, was used to calculate absolute concentrations of alkylbiphenyls and alkyldiphenylmethanes, with a response factor of 1.0.…”

Section: Methodsmentioning

confidence: 99%

“…Previous studies showed that with increasing maturity of the sediments, isomers with ortho substituents were depleted relative to those with meta or para substituents. , 2-Methylbiphenyl (MBP), with the methyl substituent in the sterically unfavorable ortho position, is less stable than 3-MBP, which has the methyl substituent at a meta position. The depletion in the abundance of 2-MBP relative to that of 3-MBP with increasing maturity has been reported. , Dimethylbiphenyls (DMBPs) detected in oil can also be used as maturity parameters, by comparison of the relative abundance of ortho -substituted isomers (i.e., 2,5-, 2,4-, 2,4′-, and 2,3-DMBP) versus the meta -substituted isomers . Although some alkylbiphenyl-derived parameters have been applied for maturity level assessment, their validity in different maturity ranges has not been fully investigated.…”

Section: Introductionmentioning

confidence: 99%

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Novel Thermal Maturity Parameters Derived from Alkylbiphenyls and Alkyldiphenylmethanes

Huang

2019

Energy Fuels

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A total of 13 Paleogene lacustrine source rocks from well LY1 in the Bohai Bay basin, East China, and 6 Carboniferous marine–continental transitional source rocks from well ZK5-1 in the Qaidam basin, Northwest China, have been analyzed by gas chromatography–mass spectrometry (GC–MS) to investigate the application of alkylbiphenyls and alkyldiphenylmethanes for maturity assessment. The Bohai Bay samples are marginally mature with vitrinite reflectance (R o) values of below 0.8%, while the Qaidam samples are highly matured with R o values of above 0.8%. In addition to validate some previous reported maturity parameters based on isomer distributions of methylbiphenyls and dimethylbiphenyls, several novel parameters based on isomer distributions, degree of alkylation, and compound types in alkylbiphenyls and alkyldiphenylmethanes have been provisionally proposed. These new parameters in the studied source rocks show good correlation with known maturity levels. Most maturity parameters are formed on the basis of relative stability of isomer substituent positions. Both meta and para substituents are confirmed to be more stable than ortho substituent counterparts, and various previously recognized maturity parameters, such as 3-/2-methylbiphenyl (MBP), 3,5-/2,5-dimethylbiphenyl (DMBP), and 3,4′-/(2,4- + 2,4′)-DMBP show linear correlation with measured R o values. Noticeably, our limited data suggest that compounds with para substituents are even more stable than those with meta substituents, as evidenced by increasing ratios of 4-/3-MBP, 4-/3-EBP, 4,4′-/3,3′-DMBP, and 3,4′-/3,3′-DMBP with maturity levels. Ethylbiphenyl (EBP) seems less stable than the methylated isomer, and ratios of 4-MBP/4-EBP and 3-MBP/3-EBP can be used as potential maturity parameters. These two parameters are likely valid only at a high maturity range when the dealkylation process has been initiated. Diphenylmethane (DPM) and its alkylated homologues show overall lower thermal stability than alkylbiphenyls, and ratios of 4-MBP/4-MDPM and 3-MBP/3-MDPM increase with increasing maturity levels as well. The risk for this type of parameter is component concentration because concentrations of alkyldiphenylmethanes are usually below the minimal requirement for reliable parameter calculation. Nevertheless, a continuous increase of these novel parameters in data from the Bohai Bay and Qaidam basins may provide a powerful tool for maturity assessment of different maturated source rocks and oils in petroliferous basins, even though depositional facies may exert some impacts on the thermal evolution behavior of alkylbiphenyls and alkyldiphenylmethanes.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel Thermal Maturity Parameters Derived from Alkylbiphenyls and Alkyldiphenylmethanes

Huang

2019

Energy Fuels

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“…The abundance of phenanthrenes relative to naphthalenes suggests that the rock extracts are mature (Akinlua et al, 2007). A number of aromatic maturity parameters based on the distribution of naphthalene, phenanthrene and alkyl isomers were calculated for the study samples after Radke et al (1982a), Radke et al (1986) and Alexander et al (1985Alexander et al ( , 1986. Radke (1988) observed that aromatic hydrocarbons do change in a regular fashion with increasing maturity and thus developed maturity parameters based on the distributions of alkylnaphthalene and alkylphenanthrene.The maturity parameters computed from the aromatic biomarker distributions in the coal and shale extracts are listed in Table 5.…”

Section: Thermal Maturitymentioning

confidence: 99%

Using aromatic biological markers as a tool for assessing thermal maturity of source rocks in the Campano-Maastrichtian Mamu Formation, southeastern Nigeria

Ogala¹,

Akaegbobi²

2014

Earth sci. res. j.

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The concentration and distribution of aromatic biomarkers in coals and shales from five boreholes penetrating the Maastrichtian Mamu Formation of the Anambra Basin, southeastern Nigeria, were investigated by gas chromatography-mass spectrometry to assess the thermal maturity and organic matter input. The study focused on the variations of the relative abundances of naphthalenes, phenanthrenes, and monaromatic and triaromatic steroids identified on the mass fragmentograms. Trimethylnaphthalene (TMN) is the most abundant member of the naphthalene family while methylphenanthrene (MP) is the most abundant phenanthrene family member. The total of phenanthrenes and their isomers was greater than that of naphthalenes. The distribution of these aromatic hydrocarbons and their akyl derivatives was strongly controlled by a selective expulsion mechanism and thermal maturation of organic matter. The low dibenzothiophene/phenanthrene (DBT/PHEN) ratios (0.01-0.06), as well as the enhanced concentrations of 1,2,5-TMN relative to 1,2,7-TMN, indicates organic matter derived mainly from higher plants, and the extract ternary plot of C 27 , C 28 and C 29 monoaromatic steroids suggests a Type III and mixed Type II/III kerogen. The calculated mean vitrinite reflectance (%Rm), determined from the distributions of the isomers of methyldibenzothiophene ratio (MDR) in the rock extracts, ranged from 0.51 to 1.43. These maturity values indicate that the coal and shale extracts are marginally mature for hydrocarbon generation.La concentración y distribución de biomarcadores aromáticos en carbones y esquistos de cinco perforaciones en la formación Maastrichtian Mamu de la cuenca de Anambra, en el sureste de Nigeria, fueron analizados a través de un estudio de espectometría cromatográfico y de masa del gas para medir la madurez termal y la entrada de material orgánico. El estudio está enfocado en las variaciones de la abundancia relativa de naftalinas y fenantrenos, y en los esteroides monoaromáticos y triaromáticos identificados en los fragmentogramas de masas. La trimetinaftalina (TMN) es la más abundante de la familia de las naftalinas mientras el metilfenantreno (MP) es el más abundante de los fenantrenos. El tota de los fenantrenos y sus isómeros fue mayor que el de las naftalinas. La distribución de estos hidrocarbones aromáticos y sus alquilos derivados fue controlada ampliamente por un mecanismo de expulsión selectiva y de la maduración térmica de material orgánico. La baja proporción dibenziotofeno/fenantreno (DBT/ PHEN) (0.01-0.06), al igual que las concentraciones mejoradas de 1,2,5-TMN relativas de 1,2,7-TMN indican que la materia orgánica se deriva principalmente de plantas mayores, y del diagrama terniario de los esteroides monoaromáticos C 27 , C 28 y C 29 sugiere un tipo III mezclado con tipos II/III de querógenos. El valor calculado de la reflectancia de vitrinita (%Rm) determinado de la proporción de isómeros de metildibenziotofeno (MDR) en los extractos rocosos oscila de 0.51 a 1.43. Estos valores de madurez indican que lo...

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“…A class of atomatic compounds which has been studied extensively for this purpose is the alkylbiphenyls which occur in organic materials of sedimentary origin including crude oil (Adams & Richardson, 1953;Mair & Mayer, 1964)and shale oil (Rovere et al, 1983). Their abundance in crude oil means they are readily accessible for chemical analysis and their distribution in sediments has been studied extensively by Alexander et al (1986) and Cumbers et al (1987). Because these compounds are represented both in crude oils and source rock extracts it is possible to compare the thermal histories of crude oils with those of source rock formations.…”

Section: Introductionmentioning

confidence: 99%

“…In their study of alkylbiphenyl distributions in sediments Alexander et al (1986)showed that depletion of certain isomers occurred with increasing maturity of the sediments. This implies that the extent of a given reaction may be expressed as a function of the formation temperature (or equivalently, burial depth) and ifthe kinetic parameters for the reaction can be determined, palaeogeothermal gradients may be inferred from measurements ofthe extent of reaction in the sediment sample.…”

Section: Introductionmentioning

confidence: 99%

Statistical Estimation of Petroleum Geochemistry Parameters

Perriman¹

1990

The Statistician

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Parameters based upon the aromatic compounds found in crude oil and sediments have been shown to be very useful geochemical tools. For example, by detailed analysis of the aromatic fraction of a crude oil it is possible to characterize the nature of the petroleum source material, to assess the maturity of the sediments at the time of expulsion and for the thermal history of the sediment column to be reconstructed. We review the statistical treatment and modelling of the kinetics of biological marker reaction systems used obtaining quantification of the uncertainties in the estimation procedure associated with the prediction of crude oil formation temperatures and burial depths on the basis of the measured extent of the reaction in the sample.

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Alkylbiphenyls in ancient sediments and petroleums

Cited by 47 publications

References 12 publications

Novel Thermal Maturity Parameters Derived from Alkylbiphenyls and Alkyldiphenylmethanes

Novel Thermal Maturity Parameters Derived from Alkylbiphenyls and Alkyldiphenylmethanes

Using aromatic biological markers as a tool for assessing thermal maturity of source rocks in the Campano-Maastrichtian Mamu Formation, southeastern Nigeria

Statistical Estimation of Petroleum Geochemistry Parameters

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