This article presents the results of drilling a 1-k core well in Zverinogolovskoye district of Kurgan region and the study of core material. A number of researchers have doubts about the fact that the reason of periodic appearance of an oil film on the Alabuga River was the migration of oil from the depths. Some people assumed that it could get to the river in a small amount by accident, for example, farmers spilled it during fieldwork. In 1959, 1-k and 2-k wells were drilled in order to check and study oil occurrences along the Alabuga River. Core wells 1-k and 2-k have traversed the cover deposits of the Meso-Cenozoic and have exposed the basement rocks represented by red flowers of presumably Permian-Triassic age. This made it possible to study the lithology and stratigraphy of the sediments, which were involved in the structure of the area. The angles of inclination of red-colored rocks measured by the core of the 1-k well give an idea of the degree of their disturbance. The facies-lithological features of these rocks, the absence of fauna and flora in them, and other signs indicate that the formation of red-colored deposits occurred under continental conditions. The signs of Permian-Triassic oil found in the 1-k well are of fundamental importance. These oil occurrences are also of interest in the fact that they were detected in the area, where oil was observed to the surface.