Measurements of a thermal stream frg. Available data

you are: Measurements of a thermal stream frg

Definition of a thermal stream assumes detailed knowledge of a temperature gradient on depth and factors of heat conductivity of corresponding breeds. Temperature gradients are measured mainly at temperature karotazhe chinks, and only a few values of a gradient are measured in mines. From the beginning of 1970th years temperature gradients were more often measured in lakes. Accuracy of absolute temperature measurements varies from 0,05 °s, in mines and boreholes to 0,002 °s at corresponding measurements of a temperature gradient.

On samples of rocks from chinks where distribution of temperatures is known, in laboratory heat conductivity factors are investigated. In case of lake measurements the factor of heat conductivity of deposits is defined in situ by a method of a needle probe. Results of 40 lake measurements are resulted Henelem. While separate measurement of factor of heat conductivity can be received with accuracy of 5%, some samples of the same core show the results differing on 20% or more.

Before calculation of a thermal stream in the given point influence of superficial conditions on temperature on depth was checked. In case of lake measurements the annual temperature wave which is passing through deposits at the bottom of lake was taken into consideration, and also influence osadkonakoplenija was considered. Topographical amendments both for lake, and for skvazhinnyh measurements have been counted up. The amendments concerning influence of a glacial age, were not entered yet.

As amendments, for example on a relief, are often only approach to a true environment, in calculation of values of a thermal stream there is some discrepancy. Taking into consideration the errors connected with variability of factor of heat conductivity, with imperfection of procedure of introduction of amendments and with dependence of a thermal stream on depth, the error of definition of a thermal stream is estimated in 20% or even more (see article Henelja in this collection).