Geochemical characterisation of heavily biodegraded tar sand bitumens by catalytic hydropyrolysis

Sonibare, Oluwadayo O.; Snape, Colin E.; Meredith, Will; Uguna, Clement N.; Love, Gordon D.

doi:10.1016/j.jaap.2009.05.003

Cited by 23 publications

(14 citation statements)

References 41 publications

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“…However, other n-alkanes extending beyond n-C 25 are still evident for both samples that are typical distributions for asphaltene hydropyrolysates. Note that earlier work on HyPy has shown conclusively that asphaltenes are largely immune from biodegradation so that when free n-alkanes have been biodegraded, n-alkyl moieties bound within the asphaltenes are preserved (Sonibare et al 2009). Evidence of drilling mud contamination is also apparent in the distribution of biomarkers in the hydropyrolysate aliphatic fractions, with the m/z mass 217 chromatogram of the steranes seen to be dominated by C 29 R isomer (Fig.…”

Section: Hypy Aliphatic Hydrocarbonsmentioning

confidence: 99%

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Formation of bitumen in the Elgin–Franklin complex, Central Graben, North Sea: implications for hydrocarbon charging

Meredith

Uguna

Snape

et al. 2019

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The Elgin–Franklin complex contains gas condensates in Upper Jurassic reservoirs in the North Sea Central Graben. Upper parts of the reservoirs contain bitumens, which previous studies have suggested were formed by the thermal cracking of oil as the reservoirs experienced temperatures of >150°C during rapid Plio-Pleistocene subsidence. Bitumen-stained cores contaminated by oil-based drilling muds have been analysed by hydropyrolysis. Asphaltene-bound aliphatic hydrocarbon fractions were dominated by n-hexadecane and n-octadecane originating from fatty acid additives in the muds. Uncontaminated asphaltene-bound aromatic hydrocarbon fractions, however, contained a PAH distribution very similar to normal North Sea oils, suggesting that the bitumens may not have been derived from oil cracking.1D basin models of well 29/5b-6 and a pseudo-well east of the Elgin–Franklin complex utilize a thermal history derived from the basin's rifting and subsidence histories, combined with the conservation of energy currently not contained in the thermal histories. Vitrinite reflectance values predicted by the conventional kinetic models do not match the measured data. Using the pressure-dependent PresRo® model, however, a good match was achieved between observed and measured data. The predicted petroleum generation is combined with published diagenetic cement data from the Elgin and Franklin fields to produce a composite model for petroleum generation, diagenetic cement and bitumen formation.

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Section: Hypy Aliphatic Hydrocarbonsmentioning

confidence: 99%

“…compounds such as the diasteranes (Sonibare et al 2009), and possible co-elution of isomers with the steranes (Russell et al 2004).…”

Section: Hypy Aliphatic Hydrocarbonsmentioning

confidence: 99%

Formation of bitumen in the Elgin–Franklin complex, Central Graben, North Sea: implications for hydrocarbon charging

Meredith

Uguna

Snape

et al. 2019

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“…However, the chemical aspects of the thermal behavior of industrial bitumens are still not well documented (Schlepp et al 2001;Peng et al 2018). The lack of pyrolysis data on systematic changes of molecular compositions in severely biodegraded bitumen introduces a strong limitation in kinetic parameter extraction, heavy oil and bitumen transformation modeling and exploitation optimization (Sonibare et al 2009). The purpose of the present study is to record sequential changes of bulk and molecular compositions of OSB during pyrolysis experiments and to deepen our understanding of reaction processes during in situ upgrading and/or refinery processes.…”

Section: Introductionmentioning

confidence: 99%

Bulk and molecular composition variations of gold-tube pyrolysates from severely biodegraded Athabasca bitumen

Huang

2020

Pet. Sci.

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Gold-tube pyrolysis experiments were performed on two Athabasca oil sand bitumens at 300 °C to 525 °C with 2 °C/h rate and 25 °C step under 50 MPa. Pyrolysis temperature of 425 °C is critical for weight loss of bulk bitumen and hydrocarbon generation and destruction. Polar compounds are the main source of saturated and aromatic hydrocarbon, gas and coke fractions. Molecular compositions in pyrolyzates vary systematically with increasing pyrolysis temperatures. High molecular weight n-alkanes (C26+) are gradually destructed during pyrolysis due to thermal cracking. Moderate molecular weight n-alkanes (C21–C25) show the highest thermal stability in designed pyrolysis temperatures. The loss of low molecular weight n-alkanes (C20−) might be caused by volatilization during pyrolysis, which may alter commonly used molecular parameters such as ∑n-C20−/∑n-C21+, Pr/n-C17 and Ph/n-C18. Aromatic hydrocarbons were generated from 300 to 425 °C, then condensation and dealkylation have been initiated at 425 °C as evidenced by decreased summed alkylnaphthalenes to alkylphenanthrenes ratios and increased unsubstituted aromatics to substituted homologs ratios in higher temperatures. The occurrence of anthracene and benz[a]anthracene in pyrolysates indicates pyrogenic origin, while fluoranthene shows unexpected behaviors during pyrolysis. Ratios derived from them are not always reliable for pyrogenic source input diagnosis in environmental samples.

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“…Thus covalently bound biomarkers released from high maturity kerogen can retain more origin information of organic input than free biomarkers in EOM (Sun et al, 2008). These characteristics make covalently bound biomarkers released by HyPy powerful in tackling the key problems in oil exploration, for example, in severe thermal degradation (Marshall et al, 2007;Zhou et al, 2007;Sun et al, 2008;Fang et al, 2012), severely biodegraded crude oils and tar sand bitumens (Sonibare et al, 2009), and oil-contaminated drill cuttings, where conventional approaches using free biomarkers are limited (Murray et al, 1998;Russell et al, 2004). Liao et al (2012) altered biodegraded soft bitumen to various maturities by artificial thermal simulation and then HyPy was used to release covalently bound biomarkers from these solid bitumen residues.…”

Section: Introductionmentioning

confidence: 99%

The origin of solid bitumen in the Honghuayuan Formation (O1h) of the Majiang paleo-reservoir—Evidence from catalytic hydropyrolysates

Fang

Liao

et al. 2014

Organic Geochemistry

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Geochemical characterisation of heavily biodegraded tar sand bitumens by catalytic hydropyrolysis

Cited by 23 publications

References 41 publications

Formation of bitumen in the Elgin–Franklin complex, Central Graben, North Sea: implications for hydrocarbon charging

Formation of bitumen in the Elgin–Franklin complex, Central Graben, North Sea: implications for hydrocarbon charging

Bulk and molecular composition variations of gold-tube pyrolysates from severely biodegraded Athabasca bitumen

The origin of solid bitumen in the Honghuayuan Formation (O1h) of the Majiang paleo-reservoir—Evidence from catalytic hydropyrolysates

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