Analiza rezultata površinske gamma spektrometrije na stijenama podloge neogena i utjecaj na mogućnost generiranja radiogene topline

Temperature distribution in the subsurface depends on several factors, including regional heat flow, thermal conductivity of rocks, their radiogenic potential, and local factors that can lead to higher temperatures at shallower depths, such as active migration pathways. In this work, the potential for thermogenic heat generation in the pre-Neogene basement rocks was investigated based on their content of uranium, thorium, and potassium (ABDEL HAFEEZ et al., 2019; ADABANIJA et al., 2020; SANJURJO-SÁNCHEZ et al., 2022). For this purpose, a Gamma Surveyor Vario field gamma-ray spectrometer (Fig. 1) was used to measure the concentrations of the above elements at outcrops on the margins of the Drava sub-basin. At least three measurements were made at each outcrop, which were later averaged. In total, more than one hundred observation points were measured. The general lithology was summarized in six categories (Table 1): Triassic dolomites, effusive rocks (basalt), granitoid, schist, gneiss, and Miocene effusive rocks. In most cases, the measurements yielded higher values for radioelements than the catalogue values in the Schlumberger PetroMod lithology editor (SCHLUMBERGER PETROMOD, 2022), suggesting a higher potential for radiogenic heat generation. This is a crucial parameter in basin modelling that will help to better estimate the geoenergy potential of the subsurface in the eastern part of the Drava sub-basin