Infrared spectrometric (IR) and biomarkers (tricyclic terpanes, Ts/Tm, C29/C30 hopane ratios, homohopane, gammacerane, diasteranes indices and steranes) were applied to evaluate the organic matters and crude oils to discusses a genetic relation between the organic matters and crude oils in the north Gulf of Suez. The results showed that, the organic matters of Brown Limestone Formation appear slightly mature and are originated from marine organic sources. The crude oil samples are more mature and derived mainly from mixed organic sources (mainly terrestrial with marine input) under transitional environments. Therefore, the source of oils of some wells in the northern part in the Gulf of Suez may be derived from different contributions of different origins within the Gulf.
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