This study aims to investigate how well logs can be used to estimate the total organic carbon (TOC) content in source rock (shale or carbonate) formations and how accurate it could be, taking Beni Suif Basin (Western Desert, Egypt) as a case study. When it comes to predicting total organic carbon (TOC), well logging can be used to estimate the amount of organic matter in a rock formation. One of the properties that can be measured using a well logging tool is the natural gamma radiation of the rocks. Organic-rich rocks tend to have higher natural gamma radiation levels than non-organic-rich rocks. By analyzing the natural gamma radiation levels, well loggers can estimate the total organic carbon content of the rock formation. For example, the resistivity log measures the electrical resistance of rocks, which can be used to differentiate between organic-rich and non-organic-rich rocks. The density log measures the bulk density of rocks, which can also be used to estimate TOC. Finally, the neutron porosity log measures the amount of hydrogen in rocks, which is an indicator of organic matter content. By combining the information from these different well logs, analysts can estimate the total organic carbon content of a formation. Core analysis is the most accurate way to determine total organic carbon content, but well logs can be used to estimate TOC without the need for core samples. By combining these logs (GR, Density, Neutron, Sonic, Resistivity and PEF) with other petrophysical measurements such as porosity, a more accurate estimation of TOC can be achieved.