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采用有机岩石学全岩光片镜鉴技术 ,系统研究了南堡凹陷下第三系烃源岩的显微组分组成、主要生烃组分及热演化。南堡凹陷烃源岩总体上具有以陆生高等植物生源的有机物质占优势 ,富含镜质组、贫惰性组的特点 ,孢子体、藻类体、壳屑体和矿物沥青基质为该区主要生烃组分。利用镜质组反射率 Ro 和富氢组分显微荧光的变化 ,讨论了南堡凹陷下第三系烃源岩有机质热演化的特征 ,初步提出了有机质热演化阶段的划分方案。
Using organic rock lithography technique, we systematically studied the microscopic composition, major hydrocarbon generation components and thermal evolution of the Lower Tertiary source rocks in Nanpu Sag. The source rocks in the Nanpu sag generally have the characteristics of organic material rich in terrestrial higher plants, rich in vitrinite and poor inertia. The sporophyte, algae, crust and mineral bitumen matrix are the main Hydrocarbon components. Based on the changes of vitrinite reflectance (Ro) and the fluorescence of hydrogen-rich component, the thermal evolution characteristics of organic matter in the Tertiary source rocks in the Nanpu sag are discussed, and the division scheme of the organic matter thermal evolution stage is proposed.