Development of the integrated approach for stratigraphic dissolution and correlation of Middle–Upper Jurassic disturbances of south-east of western Siberia

Abstract

Based on complex paleobotanical, lithogeochemical, IR spectrometry and thermochemical studies, stratigraphic dismemberment and correlation of productive Middle–Upper Jurassic sediments, represented by Tyumen and Naunak formations in the Dvojnaya and Snezhnaya areas, in the southeast of Western Siberia (the central part of the Tomsk Region) were carried out. A reliable basis has been created for an optimal correction of the calculation of reserves and effective development of hydrocarbon deposits. It is established that for the Tyumen formation the leading paleobotanical remains are the ferns of Coniopteris vialovae, Raphaelia diamensis and Czekanowski czekanowskia irkutensis, Cz. rigida, Phoenicopsis mogutchevae, and for the Naunak formation – Czekanowski czekanowskia tomskiensis. This is due to the paleoclimatic situation, which predetermined the composition of the plant community and the types of plant-coal-forming plants. For reliable correlation, a lithogeochemical study of sediments was carried out, taking into account the analysis of the origin of the coal. The difference in the composition of plant complexes in the suites was confirmed by the difference in the genetic properties of the marking coal-bearing deposits: the degree of biochemical stability of the organic mass of the peat, the level of gelification and the floral regeneration of the organic mass of the coals, and also the yields of light and heavy hydrocarbons.