Diamondoid hydrocarbons as a molecular proxy for thermal maturity and oil cracking: Geochemical models from hydrous pyrolysis

Wei, Zhibin; Moldowan, J. Michael; Zhang, Shuichang; Hill, Ronald J.; Jarvie, Daniel M.; Wang, Huitong; Song, Fuqing; Fago, Fred

doi:10.1016/j.orggeochem.2006.09.011

Cited by 129 publications

(98 citation statements)

References 27 publications

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“…We could see lower adamantane content in these samples, which was not primarily caused by the buried depth. We agree with the conclusion of some geochemists that low concentration of adamantine and high content of C 29 sterane 20R was the result of non-cracked oil mixed in the local oil (Zhang et al, 2011b;Wei et al, 2007).…”

Section: Distribution and Implication Of Adamantane In Crude Oils In supporting

confidence: 92%

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Distribution and Implication of Adamantane in Crude Oils in Lunnan Area, Tarim Basin in China

Zhu

Jiang

Jin

et al. 2012

Energy Exploration & Exploitation

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According to the present research, the cage structure makes adamantane very stable to resist cracking even at a higher temperature, so its concentration will be increased with temperature rising. But adamantane quantitative analysis of oil in Lunnan area shows a poor correlation between its concentration and geotemperature. Instead, it has a good relationship with maturation parameters such as the content of C 29 ααα 20R sterane and C 28 triaromatic steroid 20R as well as Ts/Tm. The reason is that the oil and cracked products generated in deep zone upwards charged in oil layers in low maturity and then turned into mixed oil which had higher concentration of Ts, adamantine etc. So it makes the parameters such as Ts/Tm ratio and adamantine concentration elevate. The incorporation a great amount of low molecular hydrocarbons diluted C 29 ααα 20R sterane and C 28 triaromatic steroid 20R, which resulted in the parameters of the mixed oil to indicate a higher maturation. Oils with higher adamantane concentration are mainly distributed on Lunnan fault-host zone, Sangtamu faulthost zone and Jilake structure zone. Cracked oil generated in deeper bed migrated along fractures which acted as channels upwards into the reservoir, and so adamantane content of the mixed oil increased. The source of Paleozoic oils in Tarim basin is involved only in two beds: lower Ordovician-Cambrian and middle-upper Ordovician. But according to the data in this paper, there is no obviously difference in adamantane concentration of oils from the two layers.

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Section: Distribution and Implication Of Adamantane In Crude Oils In supporting

confidence: 92%

“…3 + 4 -dimethyl diamantane and 1,3-dimethyl adamantane have almost the same chemical structure and cracking resisting properties, therefore they have the same effect on study of crude oil cracking. The data sheet from Wei also confirmed this point (Wei et al, 2007).…”

Section: Sample Descriptionsupporting

confidence: 53%

Distribution and Implication of Adamantane in Crude Oils in Lunnan Area, Tarim Basin in China

Zhu

Jiang

Jin

et al. 2012

Energy Exploration & Exploitation

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show abstract

“…They established diamondoid-Ro equations from pyrolysis experiments on a few immature source rocks. However, the relations were constrained by few data (3-4 points) in their work (Wei et al, 2007b), which probably influences the accuracy of the equations.…”

Section: Abundance Of Diamondoidsmentioning

confidence: 99%

“…2, respectively) (Wingert, 1992;Chen et al, 1996). Hence, the ratios of MAI [methyl adamantane index, 1-MA/(1-MA + 2-MA)] and MDI [methyl diamantane index, 4-MD/(4-MD + 1-MD + 3-MD)] were introduced to evaluate highly mature crude oils or source rocks (Chen et al, 1996;Schulz et al, 2001;Wei et al, 2006bWei et al, , 2007b ). Three ratios (DMDI-1, DMDI-2 and EAI) have been proposed to distinguish source facies (Schulz et al, 2001).…”

Section: Molecular Composition Of Diamondoidsmentioning

confidence: 99%

Variation in abundance and distribution of diamondoids during oil cracking

Fang

Xiong

Liang

et al. 2012

Organic Geochemistry

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“…Therefore, complex sample preparation procedures are not recommended for the quantification of diamondoids in crude oils, especially adamantanes. The MAI (methyl adamantane index, 1-MA/(1-MA + 2-MA)) and MDI (methyl diamantane index, 4-MD/(4-MD + 1-MD + 3-MD)) are the most commonly used maturity indices for evaluating highly mature crude oils or source rocks (Chen et al, 1996;Schulz et al, 2001;Wei et al, 2006bWei et al, , 2007b (Grice et al, 2000;Schulz et al, 2001;Wei et al, 2007b). These indices are generally calculated from the peak areas of the related compounds obtained from the mass chromatograms of the GC-MS analyses.…”

Section: Compoundmentioning

confidence: 99%

Quantitative analysis of diamondoids in crude oils using gas chromatography–triple quadrupole mass spectrometry

Liang

Xiong

Fang

et al. 2012

Organic Geochemistry

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Diamondoid hydrocarbons as a molecular proxy for thermal maturity and oil cracking: Geochemical models from hydrous pyrolysis

Cited by 129 publications

References 27 publications

Distribution and Implication of Adamantane in Crude Oils in Lunnan Area, Tarim Basin in China

Distribution and Implication of Adamantane in Crude Oils in Lunnan Area, Tarim Basin in China

Variation in abundance and distribution of diamondoids during oil cracking

Quantitative analysis of diamondoids in crude oils using gas chromatography–triple quadrupole mass spectrometry

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