VNi ratio in maltene and asphaltene fractions of crude oils from the west Venezuelan basin: correlation studies

López, Liliana; Mónaco, Salvador Lo; Galarraga, F.; Lira, Amalio Sarco; Cruz, Cipriano

doi:10.1016/0009-2541(94)00100-m

Cited by 52 publications

(28 citation statements)

References 5 publications

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“…Vanadium is commonly one of the most abundant metal elements in crude oil deposits (up to around 1200 mg L 1 ) (López and Lo Mónaco, 2004). Asphaltene in crude oil contains up to 5000 mg L 1 V (López et al, 1995). Barwise (1990) developed a classification scheme which relates the Ni/V ratio to the depositional environment; Ni is also an abundant metal in petroleum.…”

Section: Weathering and Diagenesis Of Secondary Vanadium In Minerals mentioning

confidence: 99%

Vanadium: Global (bio)geochemistry

et al. 2015

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Section: Weathering and Diagenesis Of Secondary Vanadium In Minerals mentioning

confidence: 99%

Vanadium: Global (bio)geochemistry

et al. 2015

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“…Alberdi and Lafargue, 1993; López et al, 1995). However, these studies focused on 79 the elemental distribution of Ni rather than on its isotopic characterisation, and as 80 such, no study currently exists that evaluates the behaviour of Ni stable isotopes in 81 organic-rich sediments or indeed within a stratigraphic profile.…”

Section: ) 73mentioning

confidence: 99%

Characterising the nickel isotopic composition of organic-rich marine sediments

2014

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. .5 ‰, and predominantly have Ni isotopic compositions that are heavier than those of abiotic terrestrial and extraterrestrial samples extraterrestrial and abiotic terrestrial samples (-0.1 ‰ and 0.4 ‰)(0.15 ‰ and 0.27 ‰), and in some cases present-day seawater (1.44 ‰) and dissolved Ni from riverine input (0.80 ‰). In addition, the observed degree of isotopic fractionation in the marine sediments is far greater than that of these other sample matrices. However, a strong similarity is exhibited between the δ60Ni values of the organic-rich sediments studied here and those of ferromanganese crusts (0.9 to 2.5 ‰), suggesting that factors ubiquitous to the marine environment are likely to play a key role in the heightened level of isotopic fractionation in these sample matrices. A lack of correlation between the Ni stable isotope compositions of the organic-rich sediments and Ni abundance, suggests that isotopic fractionation in these sediments is not controlled by uptake incorporation or enrichment of Ni during sediment accumulation. Further, no relationship is observed between δ60Ni and TOC concentrations or bottom-water redox conditions, indicating that the organic carbon reservoir and levels of oxygenation at the sediment-water interface do not exert a primary control on Ni isotope fractionation in marine sediments. Following examination of these relationships, it is therefore more likely that the heavy Ni isotope compositions of marine sediments are controlled by the weathering environment and the dominant sources of dissolved Ni into the global ocean reservoir.

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“…Up to date, several elements (e.g. V, Fe, Co, Ni, Cu) from the first-row transition series, which are preferentially used in geochemical studies of elemental distribution and source effects, have been determined in crude oils by techniques such as atomic absorption spectrometry, X-ray fluorescence spectrometry, ICP OES, and more recently, by ICP-MS. [4][5][6][7][8][9][10] Trace elements in crude oil are distributed between chromatographic fractions, such as aromatics, resins and the high molecular weight compounds of asphaltenes. 11 Asphaltenes are dissolved in the bulk oil by micelle formation with the resin and are insoluble in n-alkanes.…”

Section: Introductionmentioning

confidence: 99%

Trace element distributions in biodegraded crude oils and fractions from the Potiguar Basin, Brazil

Duyck¹,

Miekeley²,

Fonseca³

et al. 2008

J. Braz. Chem. Soc.

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Perfis de distribuição de elementos traços foram determinados em óleos crus de reservatórios biodegradados situados ao longo de um caminho de migração secundaria (Bacia de Potiguar, Brasil). As amostras foram fracionadas em asfaltenos, parafinas, aromáticos e polares e resina para determinação de 22 elementos traços por ICP-MS. Esses se concentram nas frações de resina e asfaltenos, exceto V e Ni também encontrados na fração de aromáticos e polares. V, Co, Ni e Mo foram influenciados por processos de biodegradação e acumulam-se nas amostras mais afetadas e de maior distância de migração. Variações semelhantes da razão Ni/V nos aromáticos e polares e dos índices de homohopano e gamacerano nas parafinas evidenciaram também a influencia da biodegradação. As distribuições elementares foram similares para os óleos e seus asfaltenos, sugerindo que esses últimos, mais refratários que o óleo original, possam ser usados como uma ferramenta geoquímica inorgânica robusta de impressão digital para caracterização de óleos.Trace element distribution patterns were determined in crude oils from onshore biodegraded reservoirs along a secondary migration trend (Potiguar Basin, Brazil). Samples were fractionated into asphaltenes, paraffins, aromatics and polars and resins for the determination of 22 trace elements by ICP-MS. Most of them are strongly enriched in the resin and asphaltene fractions, but V and Ni are also associated with the aromatic and polar fractions. V, Co, Ni and Mo were influenced by biodegrading processes and accumulate in the most affected and migrated samples. Variations of the Ni/V ratio in aromatics and polars, matching those of homohopane and gammacerane indexes in paraffin, evidenced also the influence of biodegradation. Very similar elemental distribution patterns in oil and corresponding asphaltenes were observed, suggesting that the latter fraction, more refractory than the original oil, can be used as a robust inorganic geochemical fingerprint for oil characterization.

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VNi ratio in maltene and asphaltene fractions of crude oils from the west Venezuelan basin: correlation studies

Cited by 52 publications

References 5 publications

Vanadium: Global (bio)geochemistry

Vanadium: Global (bio)geochemistry

Characterising the nickel isotopic composition of organic-rich marine sediments

Trace element distributions in biodegraded crude oils and fractions from the Potiguar Basin, Brazil

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