The aluminiferous rock series of well L58 in the eastern Longdong area of the Ordos Basin was taken as a case study to analyze the content and vertical variations of clay and aluminum minerals using elemental logging data. These results are then compared with mineral compositions and their vertical changes obtained through geochemical analysis and whole-rock XRD analysis, in order to validate the feasibility of the proposed method. Furthermore, the mineral content is correlated with the chemical weathering index, natural gamma ray values, porosity, and permeability to identify key controlling factors and diagnostic indicators for bauxite reservoirs. The results demonstrate that elemental logging data can effectively identify the mineral composition and lithology of aluminiferous rock series. High diaspore content (>75%), a low chemical weathering index (STI<15%), and elevated natural gamma values (GR>450 API) are indicative of high-quality reservoir zones, supporting the application of this method for the prediction of bauxite reservoir.