Pomiary temperatury w otworze Magnuszew

Abstract

TEMPERATURE MEASUREMENTS IN MAGNUSZEW BORE-HOLE

The author discusses the results of temperature measurements carried out three times in succession in the Magnuszew bore-hole in Central Poland (Figs. 1 and 2). In Fig. 1 he presents 3 measurements to 200 m. depth, in Fig. 2 two measurements made at the depth from 200 to 2555 m.

Thermograms Fig. 1 discloses that the signs and amplitudes of local anomalies in temperature depend of the relative proportion of temperature of the boring mud and of the rock temperature. Preceding the first temperature measurements, the mud was left motionless in the bore hole less than 24 hours; before the second measurements, this period was 36 hours and, before the third, 14 days.

In Fig. 2 the interdependence between the temperature found by the third measurement and the lithological profile of the bore-hole is clearly visible. For the individual rock complexes, the geothermal gradients have been shown in Table l. For computing the mean gradient for the interval from 62 m. to 2555 m. (0.01987°C per 1 m.); the author utilized weight depending of the thickness of the given complex. Generally speaking, the rate of equalization of temperatures between mud and surrounding rock complex decreases with the rise of the geothermal gradient.