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Thermic Environment and Thermal Evolution of the Sedimentary Cover in the Astrakhan Oil-and-Gas Province

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Abstract

Data on the temperature and heat flow distribution in the sedimentary cover of the Astrakhan arch in the Caspian Basin are considered. Depth temperatures in 2D and 3D models with the thermal tomography technology are carried out. Parameters for this calculation are represented by original data on the thermophysical properties of sedimentary cover rocks and the concentration of long-lived isotopes in rocks. Palinspastic reconstructions of the sedimentation history of the cover served as the basis for calculating the temperature evolution over 400 Ma.

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Notes

  1. Note that the association of the high-velocity rock lens with eclogites is ambiguous. The existence of a high-velocity lens can also be attributed to another process, for example, the appearance of a slab of the oceanic crust of the Ural Paleocean in the lower crust of the depression due to subduction.

  2. FEM designates the finite element method.

  3. Heat capacity of rocks is a rather conservative value. For various rock types, the heat capacity lies within narrow limits, ranging from 800 to 820 J /(kg K). The lower limit of this interval was accepted in our calculations.

  4. Experimentally determined temperature and thermal conductivity were used for 2D nonstationary models; only thermal conductivity was used for stationary models.

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Funding

This work was accomplished under the State Research Program of the Laboratory of Heat and Mass Transfer, Geological Institute, Russian Academy of Sciences (project no. 122012700311-2) and supported financially by the Russian Science Foundation (project no. 23-17-00019).

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Correspondence to M. D. Khutorskoy.

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Translated by D. Sakya

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Khutorskoy, M.D., Belykh, O.S., Nikitin, D.S. et al. Thermic Environment and Thermal Evolution of the Sedimentary Cover in the Astrakhan Oil-and-Gas Province. Lithol Miner Resour 59, 168–187 (2024). https://doi.org/10.1134/S0024490223700451

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