Związek naturalnego promieniowania gamma z zaileniem oraz litologią na przykładzie utworów dewonu Gór Świętokrzyskich

Abstract

INTERDEPENDENCE BETWEEN NATURAL GAMMA RADIATION AND CLAY CONTENT AND LITHOLOGY ON THE EXAMPLE OF DEVONIAN STRATA FROM THE HOLY CROSS MTS Summary The paper presents results of studies on natural gamma radiation of carbonate Devonian deposits from the area of the Holy Cross Mts. The results obtained made it possible to find correlations between clay and Al2O3, contents and the intensity of gamma radiation. The knowledge of these correlations makes it possible to estimate some parameters directly on the basis of well logging results. Concentrations of U, Th and K, and contributions of these elements to total rock radiation were established on the basis of spectrometric analysis of the core material. It was found that increase in clay content is accompanied by a significant increase in Th and K concentrations, whereas concentration of U remains roughly constant. The studies have also shown that the value of U/Th ratios may serve as a quantitative index for unequivocal lithological identification of rocks in the area studied. Both the studies and the analyses of the results confirm remarkable usefulness of measurements of natural gamma radiation, and particularly measurements involving spectrometric record.