Interpretation of Well Logging Data and Geological Modeling for the Reconstruction of the Thermal Evolution of the East of the Precaspian Basin

The purpose of this study is to determine paleogeographycal model, thermal evolution of the east of the Precaspian basin, Preuralian basin and Sakmara zone of Mugodzhar.

The samples have been analyzed by petrography (vitrinite reflectance) and by the microthermometry of fluid inclusions. The burial simulation and the paleotemperature estimation were calculated by the Petromod 1D software (IES Gmbh, Germany) for different tectonic zones.

The eastern border of the Precaspien basin exibits: (i) an eastern carbonated platform and a western turbiditic basin during the Carboniferous; (ii) a turbiditic basin interrupted by a horst during the lower Permien. The Preuralian Basin located eastwards shows a turbiditic basin during the Carboniferous and the lower Permian. Low homogenization temperatures (65 C) in Precaspian basin indicate low temperature trapping conditions, consistent with the low degree of maturation of the organic matter (VR <0.8). The increase in this temperature towards younger suites from the Silurian deposits - +60/+225 C toward the samples of the Prague-Em age -+110 / +290 C, which agrees with the geological evolution of the region. The time of subduction processes of the Ural paleoocean along the Eastern European plate and, accordingly, the increase in temperature regimes occur in the Devonian period.