Organic geochemical features of the maar-type oil shales of Hungary
In the last decade several so-called maar-type oil shales were discovered in Hungary, this type being infrequent on a world scale, as well. These were deposited in the enclosed lakes formed in volcanic rings. The composition of the biomass serving as precursor of the organic matter of the oil shales...
Elmentve itt :
| Szerző: | |
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| Dokumentumtípus: | Cikk |
| Megjelent: |
University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Szeged
1985
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| Sorozat: | Acta mineralogica-petrographica
27 |
| Kulcsszavak: | Geokémia, Kőzettan, Ásványtan, Földtan |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/24735 |
| Tartalmi kivonat: | In the last decade several so-called maar-type oil shales were discovered in Hungary, this type being infrequent on a world scale, as well. These were deposited in the enclosed lakes formed in volcanic rings. The composition of the biomass serving as precursor of the organic matter of the oil shales proved to be different in each bed. The organic matter of the three beds generated under the same geological but somewhat differing biological conditions is different both from qualitative and quantitative points of view. In the Pula locality the favourable environmental conditions allowed the accumulation of the algal material, its good preservation, thus the formation of type I kerogen. The organic matter of the Varkesz5 and Gerce oil shales is heterogeneous, the precursors of the kerogens of type I and HI are mixed in them. The kerogen of Varkeszo is of type n due to the higher proportions of the humic substance. The kerogen of Gerce is transitional between the types I and n . The organic matter content, the genetic potential, the HI, 01, T m a i values measured by RockEval pyrolysis, as well as the H/C atomic ratios and diagenesis coefficients (Cr/Ct) of the oil shales support the classification mentioned above. To express quantitatively the type-differences the PC/ TOC ratio seems to be suitable. Its value in the order of Pula, Gerce, Varkesz6 is as follows: 65, 47 and 38%. Taking the same sequence, the quantity of bitumen of the oil shales, formed during the natural evolution of the oil shales, is increasing, i. e. the activation energy of kerogen is decreasing. |
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| Terjedelem/Fizikai jellemzők: | 145-152 |
| ISSN: | 0365-8066 |