Geochemistry of naphthides of the Middle Carboniferous sediments of the Prikolym Uplift (North-East of Russia)

The paper presents the results of the geochemical investigation of samples from the surface bitumen occurrences in the Nyatvin stratum of the Middle Carboniferous sediments over the outcrops of the right bank of the Popovka river, a tributary of the Kolyma river, for the purpose of determining the type of naphthides and their genetic relations with the enclosing rocks. According to the obtained data, the studied samples relate to naphthides of hypergenic row, which are oxidized to a high extent in the hypergenesis zone but do not bear any evident traces of biochemical oxidizing. The detected high content of organic carbon and bitumoids in the rocks, together with the features of the distribution of relict hydrocarbons, prove evidence of the aquagenic nature of initial organic matter. In the studied samples, catagenic changes of the organic matter correspond to the average stage of mesocatagenesis, and the matter had conserved its hydrocarbon potential. This allows us to suppose that the bituminous Nyatvin stratum had generated liquid hydrocarbons and could be their source for widespread bitumen occurrences in the Middle Carboniferous sediments of the Omulev and Prikolym uplifts up to the formation of hydrocarbon pools in the submerged parts of the Indigiro-Zyryan trough. The new data on the features of group composition and chemical structure of the chloroform bitumoids and alcohol-benzene resins prove evidence of the multistage nature of migration processes and point to the mixed character of bitumen shows in the Nyatvin stratum as a result of the overlay of hydrocarbon migration fluids from the Novin suite on syngenic butumens of the Nyatvin stratum, which had already underwent substantial changes in the hypergenesis zone. From the geochemical point of view, the obtained results confirm the opinion that the Paleozoic sediments, first of all Devonian and Carboniferous, in the south-eastern part of the Indigiro-Zyryan trough are a self-object for the search of hydrocarbon pools.

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