【摘要】 本文研究了苏北盆地东台拗陷下第三系原油和生油岩,包括生物标志物分布,稳定碳同位素比值和生油岩干酪根类型。油样分成四种类型。生物标志物参数和稳定碳同位素比值可以有效地判别原油的成熟度。油源对比表明,阜宁组四段和二段的暗色泥岩是主要的生油岩。本文讨论了低成熟生油岩及其原油的生物标志物分布特征。更多还原

【Abstract】 A series of biomarkers is used to explore the biologic inputs of source rocks and oils. Oils from the Dongtai depression of the Subei Basin are characterized by abundant gammacerane and 4-methyl steranes. Both Ef4 and Ef2 source shales contain type-II-1 kerogen. Ef4 is different from Ef2 in biomarker distribution and generated oil. The former has higher Pr/Ph ratio and 4-methyl sterane/sterane ratio, but the latter has more abundant β-carotane. The presence af immature oil and source rock in the Hai’an depression indicates that the inmature oil is of commercial significance.更多还原