Radiometric characterization of the Irati Formation at Saltinho city, São Paulo State, Brazil

X-ray fluorescence (XRF) and gamma-ray spectrometry are essential analytical techniques in geological and geochemical studies, providing valuable insights into the composition, origin, and evolution of sedimentary and igneous formations. In Brazil, these methods have been increasingly applied to identify hydrocarbon-bearing regions and to characterize lithological variations across sedimentary basins. The Irati Formation, in particular, represents one of the primary hydrocarbon-generating sequences in the Paraná Basin, comprising organic-rich shales and carbonates that are capable of producing oil under suitable thermal conditions. In this context, the integration of geochemical and geophysical analyses, supported by modern computational tools, allows for a more precise interpretation of geological processes. The results revealed strong geochemical partitioning between carbonate and siliciclastic fractions, identified a hybrid lithofacies ("limestone-cucuruto"), while the K/U ratios confirmed a mineralogy poor in K-feldspars and dominated by carbonate phases. The present study applied statistical and multivariate methods using the Python programming language, enabling robust and reproducible analyses of geochemical data. This approach enhanced the understanding of the geochemical behavior of the Irati Formation, contributing to the assessment of its hydrocarbon potential within the basin's geological framework.