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琼东南盆地新生界主要发育3套烃源岩,即始新统湖相油源岩、渐新统气源岩及中新统海相气源岩。勘探研究表明,迄今为止在琼东南盆地发现的油气主要来自渐新统烃源岩。渐新统煤系烃源岩有机碳含量和生烃潜力都达到了好的烃源岩有机质丰度标准,渐新统崖城组和陵水组泥岩有机碳含量较高,具有一定的生烃潜力;崖城组和陵水组烃源岩干酪根显微组分主要为镜质组,富氢组分腐泥组和壳质组含量较低,干酪根类型主要为Ⅱ2型和Ⅲ型,以生气为主。崖城组煤系烃源岩正构烷烃以高碳数分布为主,Pr/Ph值较高,伽马蜡烷指数低,烃源岩主要发育于氧化环境;崖城组泥岩以氧化环境为特征,藿烷系列化合物中检测到高含量的奥利烷,表明高等植物生源输入明显,煤抽提物中规则甾烷C27、C28、C29呈反“L”型分布,主要以高等植物的陆源输入为主,崖城组和陵水组泥岩规则甾烷C27、C28、C29呈“V”型分布,表明生源除了高等植物,藻类也有一定的贡献,部分陵水组烃源岩样品藻类输入明显增多,生烃条件更加有利。
The Cenozoic in the Qiongdongnan Basin mainly develops three sets of source rocks, namely, the Eocene lacustrine source rocks, the Oligocene source rocks and the Miocene marine source rocks. Exploration studies show that so far the oil and gas discovered in the Qiongdongnan Basin mainly come from the Oligocene source rocks. The organic carbon content and hydrocarbon generation potential of the Oligocene coal measures are both good organic matter abundance standards for source rock. The Oligocene Yacheng Formation and the Lingshui Formation have higher organic carbon content and some hydrocarbon generation Potential. The microscopic compositions of kerogen in the Yacheng Formation and the Lingshui Formation are mainly vitrinite, while the hydrogen-rich component is low in sapropelite and crust. The kerogen types are mainly Ⅱ2 and Ⅲ, Mainly angry. The Paleogene source rocks of Yacheng Formation are characterized by high carbon number distribution, high Pr / Ph value and low gamma-alkane index, and the source rocks mainly develop in oxidizing environment. The mudstone of Yacheng Formation is characterized by its oxidative environment The higher content of oliram was detected in the hopane series compounds, indicating that the input of higher plant biomass was obvious. The regular steranes C27, C28 and C29 in the coal extract showed anti-L-type distribution, mainly in higher plants . The regular distribution of steranes C27, C28, C29 in the Yacheng Formation and the Lingshui Formation shows a “V ” type distribution, which indicates that besides the higher plants and algae, the source also contributes to some extent. Some of the source rocks Sample algae input significantly increased, hydrocarbon generation conditions more favorable.