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  • 1
    Electronic Resource
    Electronic Resource
    Biological activity in the deep subsurface and the origin of heavy oil (2003)
    [s.l.] : Nature Publishing Group
    Nature 426 (2003), S. 344-352 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] At temperatures up to about 80 °C, petroleum in subsurface reservoirs is often biologically degraded, over geological timescales, by microorganisms that destroy hydrocarbons and other components to produce altered, denser 'heavy oils'. This temperature threshold for hydrocarbon biodegradation ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature02134
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Adsorptive interaction between nitrogen compounds and organic and/or mineral phases in subsurface rocks. Models for compositional fractionation of pyrrolic nitrogen compounds in petroleum during petroleum migration (1994)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 17 (1994), S. 230-236 
    Details
    ISSN: 0935-6304
    Keywords: Nitrogen compounds ; Alkylcarbazoles ; Analytical TLC ; Oil migration ; Crude oils ; Petroleum source rocks ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The results are reported of a range of laboratory chromatographic fractionation experiments with synthetic model compounds and a petroleum pyrrolic nitrogen fraction. Reversed phase separation of pyrrolic nitrogen compounds was governed mainly by the number of carbon atoms in the molecule, with little selectivity toward different positional isomers, whereas normal phase separation of the compounds could be explained in terms of steric effects related to alkylation position. Comparison of experimental results from model compounds with observations made previously using sets of natural samples taken from sedimentary basins clearly suggests adsorptive interactions between organic and mineral phases are involved in the compositional fractionation of pyrrolic nitrogen compounds in petroleum during migration. Detailed studies of the effects of petroleum migration on the molecular distribution of petroleum pyrrolic nitrogen compounds may provide useful, quantifiable, migration-related geochemical parameters.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240170408
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  • 3
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    The controls on the composition of biodegraded oils in the deep subsurface – Part 4. Destruction and production of high molecular weight non-hydrocarbon species and destruction of aromatic hydrocarbons during progressive in-reservoir biodegradation (2017)
    Elsevier
    In:  Organic Geochemistry, 114 . pp. 57-80.
    Details
    Publication Date: 2020-08-13
    Description: This study extends the analysis of previously well studied biodegraded crude oil case history sample sets. The analytical window is extended into the high molecular weight, aromatic hydrocarbon and non-hydrocarbon fraction of crude oils, using a 12 T ultra-high resolution mass spectrometer (FTICR-MS). Biodegradation is pervasive across compound groups and extent of degradation appears dependent on compound abundance and hence availability. Oil constituents with molecular weights up to m/z 600 (carbon number 44) are affected by in-reservoir biodegradation. Apart from special, specific compound groups possibly related to the active reservoir biomass, all hydrocarbon and single heteroatom-containing compound classes are depleted by biodegradation. Production of various highly alkylated species indicate that transformation of crude oil components often involves derivatization and preservation rather than just complete destruction of high molecular weight compounds. Whereas one case study shows good correlation between depletion of S1 species and a strong increase in SO2 species, a nitrogen enriched oil suite shows an analogous trend in the transformation of N1 species to the corresponding NO2 species. Increase in O2 species are seen in both sample sets indicating partial oxidation is a major overall process in in-situ reservoir biodegradation. These variations are important geochemically but also impact transport, interfacial and corrosion properties of oils. Nitrogen isotope systematics indicate that nitrogen-containing compounds might act as nitrogen nutrient sources or mainly as carbon sources for the microorganisms causing in-situ reservoir biodegradation depending level of biodegradation. Distributions of some heterocyclic species add a very biodegradation resistant parameter set, to the petroleum geochemists arsenal.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.orggeochem.2017.09.003
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    OceanRep: Article in a Scientific Journal - peer-reviewed
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