Fragment of the chemical structure of type II and II-S kerogen in the Upper Jurassic and Upper Devonian formations of the East European Platform |
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| Authors: | N S Burdel’naya D A Bushev |
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| Institution: | 1.Institute of Geology, Komi Scientific Center, Ural Division,Russian Academy of Sciences,Syktyvkar,Russia |
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| Abstract: | A model is proposed for a fragment of the chemical structures of the geopolymers based on elemental analysis and the study
of the composition of the pyrolysis products of kerogen from the Upper Jurassic and Devonian formations in the East European
Platform. The Sorg/C ratio in kerogen from oil shales from J3v2 is 0.4 or higher, and this kerogen belongs to type II-S, while kerogen from the Domanik rocks does not contain S and belongs
to type II. The composition of the pyrolysis products of the Upper Jurassic kerogen testifies to the presence of polysulfur-bound
structures in this geopolymer, whose thermolysis results in disulfuric cyclic compounds. No structures of this type are contained
in Domanik kerogen. Oxygen-bearing groups in J3v2 kerogen are thought to be partly concentrated on simple-ether bonds, whereas D3dm kerogen is likely dominated by compound-ether and carboxyl structures. Nitrogen-bearing structures in kerogen from Upper
Jurassic and Domanik formations are of different genesis: while nitrogen-bearing structures in Jurassic kerogen are mostly
aminoacids, Domanik kerogen contains chitin derivatives. |
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