Thermal Regime and Ground-Water Movement in the Pripyat Trough

Abstract

The space-time structure of terrestrial temperature field of the Trough and of the same name groundwater basin, which correspond to the upper part of platform cover section, is considered. Temperature measurements were fulfiled in 68 boreholes to the depths more than 2000 m. These data were used toe;ether with measured thermophysical of rosks to develop a stochastic model of terrestrial temperature as the basis for three-dimensional model of heat flow density and its divergence distribution. 1'he model of the Pripyat Trough represents a system of equations for and coefficient of heat conductivity polynomial regression three-dimensional coordinates and two-dimensional equations of margins, sethermophysical complexes /1/. platform cover represents an aniso medium. It is caused by difference in thermo-physical properties of rocks composing different structural and formational complexes. Besides this they differs also according to pattern of ground-water filtration in • Temperature fields evolution in anisotropic media are following some governing physical laws and require to take into account existing heterogeneities of the section. In this respect tIle cover vms subdivided into thermophysical complexes, 'nhich itself on tIle way of heat transfer. 'l'wo such complexes a and b, havine; similar thermophysical properties, but different conditions of ground-water filtration, were picked out. The a complex includes the mesozoic-ceno>::oic sediments, and b complex includes the carboniferous and the above--salt deposits. The upper halite layer (c complex) has heat conductivity and is con8idered as impermeable. The inter-salt deposits and the lower salt body form the d and e complexes correspondine;ly. Every of these complexes has thickness, which is enough to study spatial peculiarities of. its ambient temperature field three-dimensional trend method.