Characterization of Sedimentation Conditions Based on Composition of Organic Matter Dispersed in Rock of an Exploration Well on the Right Bank of the Ob River in Tomsk Oblast

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Abstract

The composition of biomarkers of the Upper Jurassic rocks of the Vostochno-Payduginskaya exploration well of the section of the Maryanovskaya and Naunaksk formations was investigated. The conditions of organic matter (OM) sedimentation were characterized based on data on the hydrocarbon composition, namely: the distribution of normal and isoprenoid alkanes, phenanthrenes, steranes, hopanes, alicyclic and aromatic hydrocarbons. It was found out that organic matter (OM) was deposited throughout the section under study under oxidizing conditions. The sediments of the Naunaksk formation were formed in a shallow basin uncontaminated with hydrogen sulfide, while the OM of the Maryanovsk formation was formed in lacustrine environment. The presence of low concentrations of gammacerane in the Maryanovsk formation and the lower parts of the Naunaksk formation indicates weakly saline waters of the sedimentation basin during this period. The participation of higher plants in the formation of the OM composition of the Naunaksk rocks is evidenced by the high concentrations of cadalene, retene, and the presence of simonellite and C25 and C27 n-alkanes.

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About the authors

N. A. Krasnoyarova

Institute of Petroleum Chemistry, Siberian Branch of the Russian Academy of Sciences

Author for correspondence.
Email: natalex@ipc.tsc.ru
Russian Federation, Tomsk

O. V. Serebrennikova

Institute of Petroleum Chemistry, Siberian Branch of the Russian Academy of Sciences

Email: ovs49@yahoo.com
Russian Federation, Tomsk

P. B. Kadychagov

Institute of Petroleum Chemistry, Siberian Branch of the Russian Academy of Sciences

Email: pkad@ipc.tsc.ru
Russian Federation, Tomsk

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2. Fig. 1. Hydrocarbon group composition (a) and changes in the content of simonellite, cadalene and retene (b) in the OM of the Upper Jurassic section of the East Paiduginskaya well

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