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A series of biomarkers is used to explore the bio-inputs of source rocks and oils, Oils from the Dongtaisag of the Subei Basin are characterized by abundant gammacerane and 4-methyl steranes. Both Ef~4 and Ef~2source shales contain type-II_1 kerogen. Ef~4 is different from Ef~2 in biomarker distribution and generated oil.The former has higher Pr/Ph and 4-methyl sterane/sterane ratios, but the latter has more abundant β-carotane. The presence of immature oils and source rocks in the Hai’an depression indicates that theimmature oils are of commercial value.
A series of biomarkers is used to explore the bio-inputs of source rocks and oils, Oils from the Dongtaisag of the Subei Basin are characterized by abundant gammacerane and 4-methyl steranes. Both Ef ~ 4 and Ef ~ 2source shales contain type-II_1 Kerogen. Ef ~ 4 is different from Ef ~ 2 in biomarker distribution and generated oil. The former has higher Pr / Ph and 4-methyl sterane / sterane ratios, but the latter has more abundant β-carotane. The presence of immature oils and source rocks in the Hai’an depression indicates that theimmature oils are of commercial value.