The present work aims to analyze the distribution of radionuclides naturally occurring in the oil shale of the Ama Fatma coastal zone. For this purpose, using gamma-ray spectrometry, we analyzed the activity concentrations of uranium (U), thorium (Th) series, and potassium-40 (K-40) in oil shale samples retrieved from the study area. The concentrations of U-238 were ranged from 45 ±36 to 194±50 Bq.kg^-1 and those of Th-232 fluctuate between 1.48±0.92 and 9.47±1.06 Bq.kg^-1. The measured concentrations for Ra-226, Pb-214 and K-40 oscillate between 33±5 and 138±9 Bq.kg^-1, 18±1 and 68±3 Bq.kg^-1 and between 17±4 and 279±16 Bq.kg^-1 respectively. The obtained values variation appears to be related to the deposit nature and assimilation processes of appropriate radionuclides rather than to the retrieved samples’ related depth. The analysis of the ²³²Th/²³⁸U and ²²⁶Ra / ²³⁸U allowed an understanding of these radionuclides behaviors. The ratios ²²⁶Ra / ²³⁸U ranged from 0.56 to 0.74 with a mean value of 0.70 which indicates the existence of disequilibrium in the investigated oil shale samples. This disequilibrium can be attributed to significant differences in the mobility of these radionuclides.