Dibenzothiophene, phenanthrene, methyldibenzothiophene, methylphenanthrene, nickel and vanadium content, have been determined in eight oil samples from different oil fields in the Central Gulf of Suez. These parameters are used together to provide information on source organic matter input, depositional environment, and the maturity of oils. The results showed that the crude oil samples are classified into moderately mature oil which include N. October, Belayim marine, Belayim Land and July fields, generated in a strongly reducing (marine) environment, characterized by low wax content, moderate to high sulfur, high concentrations of nickel and vanadium, and low nickel/vanadium ratios. Mature oils generated from source rocks deposited in lacustrine palaeoenvironmental conditions and includes oils from Issaran, E. kareem, El-Khaligue and El Ayun fields characterized by high wax, low sulfur, low quantities of metals, and have higher nickel/vanadium ratios.
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