The Murzeq Basin is one of the Libya’s five onshore main basins and includes six oil fields. The Ordovician reservoirs (Mamuniyat Formation) is the most essential petroleum system in the Murzuq Basin. The Mamuniyat Formation in Murzuq Basin is composed of massive sandstone that hosts uranium deposits.

This study is based on a database of wireline recordings from a single well, which includes spectral gamma ray, spontaneous potential, neutron, sonic, and density logs, where the Mamuniyat reservoir has been subdivided based upon the percentage of uranium content to (1) Mamuniyat reservoir with high content of uranium (designated as HM) and the (2) Mamuniyat reservoir with low content of uranium (designated as LM). Reservoir petrophysical parameters were computed independently to determine the influence of uranium on these properties.

The results demonstrate differences in petrophysical parameters between both reservoirs owing to the influence of uranium concentration, where the average of shale volume and porosity is greater in the HM reservoir than the LM reservoir. The average water saturation value decreases drastically in the HM reservoir.