The molecular gas chromatography and ion mass spectrometry parameters which obtained from analyses of gas chromatography and gas chromatography–mass spectrometry to proven normal alkanes and triterpanes parameters of the crude oil samples collected from Bahariya, Alam El Bueib and Khatatba reservoirs. The results revealing that the alkanes ratios of Bahariya and Alam El Bueib oils indicate a mature sample of mixed organic source, deposited under transitional environment. While the of Khatatba oil suggest that marine organic matters, mainly algae, deposited under reducing conditions. Triterpanes biomarkers showing that the Bahariya and Alam El Bueib oils that have the hydrocarbons derived from source rocks rich in carbonaceous organic matters. Khatatba oil is derived from marine organic matters with slightly input from terrigenous sources.
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