Organic geochemistry of Venezuelan extra-heavy crude oils 2. Molecular assessment of biodegradation

Cassani, Fernando; Eglinton, G.

doi:10.1016/0009-2541(91)90093-7

Cited by 46 publications

(26 citation statements)

References 22 publications

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“…The relative abundances of more and less thermally stable biomarker isomers, or their degree of aromatization, will testify to the thermal maturity of the source rock strata when the oil was expelled (e.g., Seifert and Moldowan, 1978;Mackenzie et al, 1980;Radke, 1988;Farrimond et al, 1998). Finally, after reaching a reservoir (but prior to its discovery and production) crude oil composition can further change due to water-washing by meteoric water, deasphaltening, or biodegradation in the reservoir (Connan, 1984;Seifert et al, 1984;Palmer, 1993;Cassani and Eglinton, 1991. Finally, after reaching a reservoir (but prior to its discovery and production) crude oil composition can further change due to water-washing by meteoric water, deasphaltening, or biodegradation in the reservoir (Connan, 1984;Seifert et al, 1984;Palmer, 1993;Cassani and Eglinton, 1991.…”

Section: Primary Control -Crude Oil Genesismentioning

confidence: 99%

Chemical fingerprinting of spilled or discharged petroleum — methods and factors affecting petroleum fingerprints in the environment

Stout¹,

Wang

2007

Oil Spill Environmental Forensics

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Section: Primary Control -Crude Oil Genesismentioning

confidence: 99%

Chemical fingerprinting of spilled or discharged petroleum — methods and factors affecting petroleum fingerprints in the environment

Stout¹,

Wang

2007

Oil Spill Environmental Forensics

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“…Naphthalenes degrade prior to phenanthrenes and dibenzothiophenes and chrysenes are much more resistant (Sauer et al, 1998). Differing susceptibility to biodegradation of isomers of alkyl naphthalenes, alkyl phenanthrenes, diphenylmethanes and alkyl biphenyls have also been reported (Solanas, et al, 1984;Volkman et al, 1984;Rowland et al, 1986;Williams et al, 1986;Budzinski et al, 1995;Cassani and Eglinton, 1991;Fisher et al, 1996Fisher et al, , 1998Ahmed et al, 1999;Trolio et al, 1999;Fisher, 2002), and are largely controlled by the size and ring position of the alkyl substituents (Huang et al, 2004;Le Blond et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Sequential hydrocarbon biodegradation in a soil from arid coastal Australia, treated with oil under laboratory controlled conditions

Greenwood

Wibrow

George

et al. 2008

Organic Geochemistry

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A general consistency in the sequential order of petroleum hydrocarbon reduction of previous biodegradation studies has led to the proposal of several molecular based biodegradation scales. Few studies have investigated the biodegradation susceptibility of petroleum hydrocarbon products in soil media, however, and metabolic preferences can change with habitat type. A laboratory based study comprising the GCMS analyses of extracts of oil-treated soils incubated for up to 161 days was conducted to investigate the biodegradation of crude oil exposed to sandy soils of Barrow Island, home to both a class A nature reserve and Australia's largest onshore oil field. Biodegradation trends of the Barrow soils were largely consistent with previous reports but some unusual behavior was recognised both between and within hydrocarbon classes. For example, the n-alkanes persisted at trace levels from day 86-161 following the removal of typically more stable dimethyl naphthalenes and methyl phenanthrenes. The relative susceptibility to biodegradation of different di-tri-and tetramethylnaphthalene isomers also showed several features distinct from previous reports. The unique biodegradation behavior of Barrow Is. soil likely reflects difference in microbial functioning with physiochemical variances of the environment. Correlation of molecular parameters, reduction rates of selected alkylnaphthalene isomers and CO 2 respiration values to a delayed (61 d) oiltreated soil identified a slowing of biodegradation with microcosm incubation, and a reduced function or population of incubated soil flora might also influence the biodegradation patterns observed.

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“…Experimental GC conditions were as follows: helium was used as the carrier gas at 25 psi, and the oven was programmed for an initial temperature of 80 °C (hold for 4 min) to 290 °C at 4 °C/min, then to 290 °C for 10 min. Peaks were identified by comparison with data reported in the literature (Galarraga, 1986;Cassani and Eglinton, 1991;Tocco et al, 1995).…”

Section: Methodsmentioning

confidence: 99%

Main Factors Controlling the Compositional Variability of Seepage Oils From Trujillo State, Western Venezuela

Galarraga

Urbani

Escobar

et al. 2010

Journal of Petroleum Geology

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The organic geochemistry of eighteen samples of seepage oils from Trujillo State, Western Venezuela, was investigated. These oils are probably derived from the predominantly marine Cretaceous La Luna Formation which is near peak maturity for oil generation. A range of biomarkers (n‐alkanes, acyclic isoprenoids, phenanthrene and alkyl‐phenanthrenes, as well as dibenzothiophene and alkyl‐dibenzothiophenes) were analysed by gas chromatography ‐ mass spectrometry (GC‐MS). The seepage oils have been modified as a result of water washing and biodegradation. A first group of samples were slightly biodegraded with the partial loss of n‐ and iso‐alkanes. Other samples fall into two groups: those that are moderately degraded, with partial depletion of acyclic isoprenoids; and those that are severely altered, as indicated by the partial or total absence of hopanes. One objective of this work was to evaluate the factors influencing the compositional differences of the three samples sets. In‐situ measurements, together with the interpretation of the geochemical data, suggest that diverse factors were responsible for these variations. These included different degrees of alteration due to biodegradation and water washing, as well as differences in flow rate towards the surface.

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Organic geochemistry of Venezuelan extra-heavy crude oils 2. Molecular assessment of biodegradation

Cited by 46 publications

References 22 publications

Chemical fingerprinting of spilled or discharged petroleum — methods and factors affecting petroleum fingerprints in the environment

Chemical fingerprinting of spilled or discharged petroleum — methods and factors affecting petroleum fingerprints in the environment

Sequential hydrocarbon biodegradation in a soil from arid coastal Australia, treated with oil under laboratory controlled conditions

Main Factors Controlling the Compositional Variability of Seepage Oils From Trujillo State, Western Venezuela

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