Distributions of methylated naphthalenes in crude oils: indicators of maturity, biodegradation and mixing

Aarssen, B.G.K. van; Bastow, Trevor P.; Alexander, Robert; Kagi, Robert I.

doi:10.1016/s0146-6380(99)00097-2

Cited by 275 publications

(99 citation statements)

References 26 publications

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“…Several mechanisms have been suggested to explain this inconsistency, including catalytic intervention (Mango and Hightower, 1997), gas fractionation during expulsion (Inan, 2000), fractionation during migration (Price andSchoell, 1995, Snowdon, 2001) and accumulation efficiency (Michels et al, 2002). Others have proposed specific precursors to methane, including methyl naphthalenes (van Aarssen et al, 1999) and phenanthrenes (McNeil and BeMent, 1996). The present study shows that the chemical composition of gases depends significantly on the precursors of gases.…”

Section: Constituents In Gasesmentioning

confidence: 66%

A comparative experimental study on gas generation from saturated and aromatic hydrocarbons isolated from a Cambrian oil in Tarim basin

Tian¹,

Xiao²,

Gan³

et al. 2010

Geochem. J.

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The saturated and aromatic hydrocarbons isolated from a Cambrian oil (TZ62well) in the central Tarim basin were pyrolyzed in sealed gold tubes to investigate how the gases generated from them would vary in compositions of constituents and their carbon isotopes. The results illustrates that the gases from the cracking of saturates are much drier and more enriched in 12 C than the gases from the cracking of aromatics at the same levels of thermal maturity. The dryness index of the gases (defined as the volume percentage of C 1 to C 1-5 ) from the cracking of saturates ranges from 26.2% to 90.6% whereas it is never lower than 60.6% for the gases from the cracking of aromatics throughout the experiment. The methane from the saturates shows a larger carbon isotope change, ranging from -54.8‰ to -35.5‰, than the methane from the aromatics whose carbon isotopes range from -37.4‰ to -32.2‰ throughout the experiment. The above experimental observations indicate that the cracking of crude oils with different bulk compositions could produce gases that have distinct constituents and carbon isotopic compositions.

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Section: Constituents In Gasesmentioning

confidence: 66%

A comparative experimental study on gas generation from saturated and aromatic hydrocarbons isolated from a Cambrian oil in Tarim basin

Tian¹,

Xiao²,

Gan³

et al. 2010

Geochem. J.

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“…And the conversion formula of R o and dimethyl-benzothiophene ratio has been put forward [26] [27]. The ratio of three methylnaphthalene TMNr = 2,3-TMN/(1,2,5-TMN + 2,3,6-TMN) were put forward [28]. And when the ratio of TMNr is greater than 0.6, it represents the high maturity [29].…”

Section: The Relationship Between C 27 /C 29 Ratio and Aromatics Matumentioning

confidence: 99%

“…C 27 regular sterane indicates the source of aquatic algae, while C 29 regular sterane suggests the source of higher plants. So the relative percentage content of C 27 , C 28 and C 29 regular sterane can be frequently used to judge source input and oil source correlation [1] [7] [8]. If the compound of C 27 and C 29 regular sterane appears on a double peak in the chromatograms, this can be speculated that the Organic matter is not only derived from continental deposits but also from Marine deposits [9].…”

Section: Introductionmentioning

confidence: 99%

Thermal Effect on the Distribution of Regular Sterane and Geological Significance

Yang¹,

Zhang²,

Chen³

et al. 2017

OJOGas

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In order to study thermal effect on distribution characteristics of regular sterane in humic coals, a suit of 25 coals derived from Kuqa Depression in Tarim Basin and Ordos Basin are studied to investigate the distribution of regular sterane in different maturity, which mainly discusses the thermal effect. The results show that the C 27 ααα/C 29 ααα regular sterane ratio has a linear relationship with R o (t max ) and aromatic hydrocarbon maturity parameters in the coals from mature to high-mature stage. It suggests that the distribution of the C 27 , C 29 regular steranes will fail to reflect original source input in high evolutionary stage. On the basis of thermal simulation experiment results, it further proves that the distribution patterns result from the demethylation effect of C 29 sterane in the mature to high mature evolution stage and the C 27 ααα/C 29 ααα regular sterane increases with increasing maturity. The breakage of C-C key in branched chain from C 27 , C 29 regular steranes to make C 27 ααα/C 29 ααα regular sterane ratio invariance at high and over mature stage. Therefore, the ratio can be used to distinguish the maturity in high and over mature stage.

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“…(Garrigues et al, 1988). Catalysis by clay mineral surfaces has been shown in different circumstances to promote methylation or demethylation of PAHs in shales and crude oils (Alexander et al, 1995;van Aarssen et al, 1999) and thus can influence the values of aromatic maturity parameters (Nabbefeld et al, 2010). Larger PAHs with four or more aromatic rings are not generally used in maturity parameters, although they may be produced by burial metamorphism (Brocks et al, 2003) and have been detected in high abundances in submarine hydrothermal petroleum (Kawka and Simoneit, 1990;Simoneit, 1994;Simoneit et al, 2004).…”

Section: Introductionmentioning

confidence: 99%

Effects of sulfide minerals on aromatic maturity parameters: Laboratory investigation using micro-scale sealed vessel pyrolysis

Holman

Greenwood

Brocks

et al. 2014

Organic Geochemistry

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a b s t r a c tSedimentary organic matter from the Here's Your Chance (HYC) Pb-Zn-Ag deposit (McArthur Basin, Northern Territory, Australia) displays increased thermal maturity compared to nearby non-mineralised sediments. Micro-scale sealed vessel pyrolysis (MSSVpy) of an immature, organic rich sediment from the host Barney Creek Formation (BCF) was used to simulate the thermal maturation of OM from the HYC deposit, and to assess the effect of sulfide minerals on organic maturation processes. MSSVpy at increasing temperatures (300, 330 and 360°C) resulted in increased methylphenanthrene maturity ratios which were within the range reported for bitumen extracted from HYC sediments. The methylphenanthrene index ratio from MSSVpy of the BCF sample was lower than in HYC, due to a reduced proportion of methylated phenanthrenes. Polycyclic aromatic hydrocarbons with four to six rings were produced in increasing abundance as pyrolysis temperature increased, although they did not approach the levels reported from HYC. Addition of lead sulfide, zinc sulfide and pyrite to the MSSVpy experiments resulted in a reduced response of the methylphenanthrene maturity parameters, possibly due to retardation of methyl-shift and transmethylation reactions.

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Distributions of methylated naphthalenes in crude oils: indicators of maturity, biodegradation and mixing

Cited by 275 publications

References 26 publications

A comparative experimental study on gas generation from saturated and aromatic hydrocarbons isolated from a Cambrian oil in Tarim basin

A comparative experimental study on gas generation from saturated and aromatic hydrocarbons isolated from a Cambrian oil in Tarim basin

Thermal Effect on the Distribution of Regular Sterane and Geological Significance

Effects of sulfide minerals on aromatic maturity parameters: Laboratory investigation using micro-scale sealed vessel pyrolysis

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