Trimethylnaphthalenes in crude oils and sediments: Effects of source and maturity

Strachan, Michael G.; Alexander, Robert; Kagi, Robert I.

doi:10.1016/0016-7037(88)90279-7

Cited by 216 publications

(83 citation statements)

References 30 publications

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“…TeMN/TMN ratios are clearly higher at 1 GPa than at 3 GPa at 400 and 500℃, but become similar at 600 and 700℃ (Figure 1(b)). 1,3,6-(αββ)-TMN and 1,3,7-(αββ)-TMN derived from methyl rearrangement of 1,2,5-(αβα)-TMN and 1,2,7-(αβα)-TMN during thermal evolution, respectively, the values of which decrease with increasing maturation [11,12] . The values of 1,2,5-TMN to 1,3,6-TMN (1,2,5-/1,3,6-TMN) of the pyrolysate range from 0.70 to 3.10 at 1-3 GPa, showing an increasing tendency with temperature increasing from 400 to 700℃ at 1 GPa, but decreasing one at 3 GPa (Figure 1(c)).…”

Section: Evolutive Characteristics Of Aromatic Hydrocarbonmentioning

confidence: 99%

Evolutive characteristics of aromatics under high pressure and temperature of deep lithosphere

Wang

Duan

et al. 2007

SCI CHINA SER D

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Pyrolysis of lignite in closed systems was conducted at temperatures from 400 to 700℃ and pressure from 1 to 3 GPa in order to investigate the evolutive characteristics of aromatics and the effects of pressure and temperature on the maturation of organic matter under the extreme conditions. The total yield of liquid hydrocarbons decreased with increasing pressure and the aromatics shows more mature with increasing temperature at a given pressure. The data indicate that high pressure significantly suppresses the thermal evolution of geological organic matter especially at lower temperature, but favors the cyclization, polymerization and aromatization of pyrolysate. The pressure effect on maturation of organic matter is nonlinear. Therefore, it can be inferred that sediment organic-matters in the subducted slab could be retained in the deep lithosphere, and the results are also significant for understanding the accumulation and preservation of petroleum in deep reservoirs.high pressure and high temperature, lignite, aromatic hydrocarbon, maturation, isomerzation, petroleum in deep reservoirs More than 180 overpressure basins have been discovered in the world at present. Overpressure not only affects the assessment of oil and gas resources in the superpressure basins, but also closely relates to the accumulation and preservation of petroleum in deep reservoirs [1] . Three conflicting opinions have been proposed based on the experiments about pressure effect on evolution of organic matter: (1) increasing pressure has no detectable effect on organic-matter maturation; (2) increasing pressure enhances the hydrocarbon thermal destruction; and (3) increasing pressure significantly retards the maturation of organic matter and hydrocarbon generation [2,3]

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Section: Evolutive Characteristics Of Aromatic Hydrocarbonmentioning

confidence: 99%

Evolutive characteristics of aromatics under high pressure and temperature of deep lithosphere

Wang

Duan

et al. 2007

SCI CHINA SER D

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“…Relative distributions of alkylnaphthalene isomers have been used to obtain information about the thermal maturity of sedimentary rocks, coals and crude oils (Radke et al, 1982a(Radke et al, , 1984(Radke et al, , 1994Alexander et al, 1985). Naphthalenes are known to be widespread constituents of geological materials and believed to have been derived partly from nonaromatic natural precursors such as terpenoids (Chaffee et al, 1984;Hayatsu et al, 1987;Püttman and Villar, 1987;Strachan et al, 1988). Increasing maturity generally increases the ratio of structurally more stable β-to less stable α-substituted isomers.…”

Section: Introductionmentioning

confidence: 99%

Naphthalenes in Neogene sediments of the Shinjo basin, Japan.

2000

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Naphthalene and its methyl homologs were found in Miocene to Pliocene sediments of the Shinjo basin. The total concentrations of naphthalenes ranged from 26 to 5,700 ng g -1 from the top to the bottom sediments of an about 1,600 m thick sequence. Naphthalenes were mainly distributed in the Kusanagi Formation and their depth profile showed a characteristic feature, indicating a concentration peak at the onset of oil-generation layer. The ratio of 2-to 1-methylnaphthalene as well as the relative abundance of dimethylnaphthalene isomers, except for 1,8-isomer, showed no depth dependence. Therefore, it seems that no significant isomerizations of the naphthalene homologs had occurred during the burial diagenesis around and above the oil-generating zone in the sediments. However, as to the least stable 1,8-dimethylnaphthalene isomer, the negative logarithmic change of the relative abundance of the isomer (Alexander et al., 1984) was observed showing a trend of increasing with depth.

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“…Aromatic biomarkers and their structural isomers have been found useful for the maturity assessment of oils, source rocks and coals (Radke et al, 1982a;Radke and Welte, 1983;Alexander et al, 1985;Radke et al, 1986;Garrigues et al, 1988;Strachan et al, 1988;Akaegbobi et al, 2000;Akinlua et al, 2007;Sonibare et al, 2008). Complex mixtures of aromatic hydrocarbons have been identified in crude oils , organic extracts of coals (Radke et al, 1982a, b;Puttman and Villar, 1987) and ancient sediments (Alexander et al, 1985;Garrigues et al, 1988Garrigues et al, , 1990.…”

Section: Introductionmentioning

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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Trimethylnaphthalenes in crude oils and sediments: Effects of source and maturity

Cited by 216 publications

References 30 publications

Evolutive characteristics of aromatics under high pressure and temperature of deep lithosphere

Evolutive characteristics of aromatics under high pressure and temperature of deep lithosphere

Naphthalenes in Neogene sediments of the Shinjo basin, Japan.

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

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