Geofizyczne zależności określone dla parametrów skał izolujących w synklinorium mogilneńskim

Abstract

GEOPHYSICAL RELATIONS DETERMINED FOR PARAMETERS OF SCREENING ROCKS IN THE MOGILNO SYNCLINORIUM

Summary

The geophysical materials from bore holes made in the Mogilno synclinorium area allowed the author to ascertain three, recurrent lithostratigraphical horizons, which may easily be correlated (Fig. 1). These have been determined as “basal insulator”, “gamma 0 horizon”, and “gamma 1 horizon”. Using the methods of mathematic statistics (calculus of the smallest squares, Cramer's formulae), a regressive analysis has been made of the results obtained. The analysis proved the possibility of a complete mutual linear correlation of the natural radioactivity character of the three horizons determined. Moreover, stability of radioactivity in the bore holes has been examined, as well. Hence, these horizons may be used for standardizing PIG probes (gamma logging) under natural conditions, in the bore holes, of the area considered. Standard unit of intensity of natural gamma radiation Dg, comparable in all the bore holes has been determined, too. The probability of the presence of a correlation of gamma radiation intensity with the unit Dg, determined in this paper, strongly exceeds 0,99. Practically, the correlation coefficients equal to 1.

Considering that the linear model of, radiation function depends upon clay contens, an approximate formula has been derived for the interpretation of Ci = f (Ig).