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Petroleum source rocks of the Silurian deposits on the Chernov swell (Timan‑Pechora basin)

I.S. Kotik, T.V. Maydl, O.S. Kotik, N.V. Pronina

Original article

DOI https://doi.org/10.18599/grs.2020.3.12-20

12-20
rus.

open access

Under a Creative Commons license
Silurian source rocks are among the least studied in the Timan-Pechora basin. This is mainly due to their occurrence at great depths (3.0-4.5 km) and the limited penetration of this stratigraphic interval by wells. Another source of information is the outcrops of the Silurian, which are known in the eastern and northeastern parts of the Timan-Pechora basin. The studied section of the Silurian deposits is exposed on the Padimeityvis River, located on the Chernov swell in the northeastern part of the basin. This article is devoted to the study of Silurian source rocks based on the results of lithological, coal petrographic studies and geochemistry of organic matter. The studied section is composed of carbonate and clay-carbonate deposits formed in shallow-water shelf conditions. Most of the section, composed of microcrystalline and microcrystalline with bioclasts limestones, is characterized by low concentrations of organic matter (Corg is generally less than 0.3 %). Elevated Corg contents (up to 1.16 %) are characteristic of clay-carbonate rock varieties, which make up about 20 % of the section. Sediments with increased concentrations of organic matter were formed in isolated and deepened areas of the bottom of the shallow-water basin as a whole. Assessment of the catagenetic transformation based on Rock-Eval pyrolysis data, coal petrographic studies, and conodont color indices showed that organic matter reached the conditions of the middle-end of the main oil generation zone (gradation MC2‑MC3). The obtained geochemical characteristics (Corg, S2, HI), taking into account a certain level of organic matter  maturity, indicate that the Silurian source rocks had an average hydrocarbon potential.
 

Chernov swell, Silurian deposits, source rocks, organic matter, catagenesis, hydrocarbons

 

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Ivan S. Kotik
Institute of Geology of Komi Science Centre of the Ural Branch of the Russian Academy of Sciences
54, Pervomayskaya st., Syktyvkar, 167982, Russian Federation
 
Tatyana V. Maidl
Institute of Geology of Komi Science Centre of the Ural Branch of the Russian Academy of Sciences
54, Pervomayskaya st., Syktyvkar, 167982, Russian Federation
 
Olga S. Kotik
Institute of Geology of Komi Science Centre of the Ural Branch of the Russian Academy of Sciences
54, Pervomayskaya st., Syktyvkar, 167982, Russian Federation
 
Natalia V. Pronina
Lomonosov Moscow State University
1, Leninskie gory, Moscow, 119234, Russian Federation
 

For citation:

Kotik I.S., Maydl T.V., Kotik O.S., Pronina N.V. (2020). Petroleum source rocks of the Silurian deposits on the Chernov swell (Timan-Pechora basin). Georesursy = Georesources, 22(3), pp. 12–20. DOI: https://doi.org/10.18599/grs.2020.3.12-20