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通过原油基本特征的分析,从生标物特征角度对南堡凹陷的原油类型进行了划分,进而结合烃源岩发育特征分析了滩海地区的油气勘探潜力。南堡凹陷的原油分为A、B、C共3种类型,A类原油根据生标物特征差异又分为A1、A2两个亚类,分别来自沙三段(Es3)烃源岩和东三段(Ed3)烃源岩,主要分布在陆上。B和C两大类原油主要分布在滩海地区,均为成熟原油。B类原油的典型特征是伽马蜡烷含量低,主要来自Ed3烃源岩,沙一段烃源岩有少量贡献;C类原油的伽马蜡烷含量高,主要来自沙三段烃源岩。滩海地区的各层段烃源岩都比较发育,演化程度高,中深层具有较好的轻质油和天然气勘探潜力。
Based on the analysis of the basic characteristics of crude oil, the types of crude oil in Nanpu Sag are divided from the point of view of the characteristics of living beings. Then the potential of oil and gas exploration in the Tanhai area is analyzed based on the development characteristics of source rocks. The crude oil in Nanpu sag is divided into three types A, B and C, and the type A crude oil is divided into two subdivisions A1 and A2 according to the characteristics of living beings, which are derived from Es3 source rocks and East Three (Ed3) source rocks, mainly distributed on land. B and C two types of crude oil are mainly distributed in the beach area, are mature crude oil. The typical features of Class B crude oil are low levels of gamma-alkane, mainly from Ed3 source rocks, and a small contribution to the source rocks of the first member of the Shahejie Formation. The C-type crude oils have high gamma-alkane content, mainly from the source rocks of the third member of the 3rd member. The source rocks of various intervals in the Tanhai area are relatively developed and have a high degree of evolution, and the middle and deep layers have good exploration potential for light oil and natural gas.