The open hole well log data (BHC, FDC, CNL, DLL and GR) of six wells (OCT-F1, OCT-F2, OCT-D4, OCT-D1, OCT-D3A and OCT-D5A) in October oil field, northern Gulf of Suez, Egypt are utilized to identify the source rock potentialities for the Lower Miocene Nukhul Formation. In this study the porosity/resistivity overlay technique is used to differentiate the source and non-source rock. Organo-source analysis of the studied rock unit takes place through the determination of shale volume (Vsh), the total organic carbon content (TOC), total organic matter (TORG) and the discrimination factor (D.F.). Moreover, six burial history diagrams were drawn for the succession penetrated by the wells drilled in the study area to illustrate the geothermal maturation concepts (geothermal gradient, time-temperature index TTI and vitrinite reflectance Ro). The results established by using well logging analysis were correlated with the results obtained from geochemical analysis. Organo-source analysis of Nukhul Formation illustrates that, this formation shows a considerable amount of organic carbon content and it is considered as non-source rock in some of the studied wells and it is thermally mature in some of the studied wells, as predicted from the values of Ro and TTI.
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