Computer Science
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52.2879l&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 52, Issue 12, pp.2879-2891
Computer Science
Scientific paper
Variations with depth in the quantitative distributions of di- and tricyclic alkylaromatic hydrocarbons and sulfur heterocycles determined for a total of thirty-two core samples from two thick shale intervals and thirteen thin interbedded shale layers of the Upper Jurassic-age Kimmeridge Clay formation, Brae field area, North Sea, reveal, in part, the effects of depletion with hydrocarbon expulsion. Trends of increasing depletion with approach to the nearest shale-sandstone contacts, as documented by a decrease in carbon-normalized yields, are more distinctive for the alkylnaphthalenes as compared to the alkylphenanthrenes and alkyldibenzothiophenes, but less drastic than previously observed for long-chain alkanes ( cf. Part I: et al. , 1988). Lowest yields consistently were encountered at the outermost 1-2 metres of the thick shale intervals and for the thin shale layers where the relative expulsion efficiencies were much higher for C 15 to C 30 n -alkanes (80-95%) than for C 2 and C 3 alkylnaphthalenes (30-40%). In contrast, C 2 and C 3 alkylbenzothiophene yields were higher in these shale portions than further inside the thick shale which is interpreted to result from a post-expulsion selective replenishment from the adjacent oil accumulation. Expulsion was not associated with any detectable fractionation among C 1 and C 3 alkylnaphthalenes or C 1 and C 2 alkylphenanthrenes, as evidenced by a mass-balance approach and concentration ratios of individual alkylaromatic isomers commonly used as maturity indicators. Based on a reconstruction of the quantitative distributions of aromatic hydrocarbons and sulfur aromatics expelled from thin shale layers from early-mature through to mature stages of thermal evolution, it was verified that the Methylphenanthrene Index (MPI 1) and methyldibenzothiophene ratio (MDR) of the expelled oil reflects the average of the maturity levels during which the source rock has expelled petroleum.
Leythaeuser Detlev
Radke Matthias
Willsch Helmut
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