江汉盆地下第三系烃源岩有机岩石学研究

作者采用有机岩石学全岩分析技术,系统研究了江汉盆地下第三系烃源岩的显微组分组成、生烃组分及有机质热演化。江汉盆地烃源岩形态显微组分含量明显偏低,平均仅占全岩体积的1.5%。显微组分组成中富含腐泥组,相对发育镜质组和壳质组,贫惰性组。有机质类型多为Ⅱ、Ⅰ型。藻类体、矿物沥青基质是该区主要生烃组分。文中利用镜质体反射率R_o及富氢组分和非烃馏分的荧光参数探讨了江汉盆地烃源岩有机质演化特征,提出了有机质的热演化阶段的划分方案。

STUDY ON THE ORGANIC PETROLOGY OF THE LOWER TERTIARY SOURCE ROCK IN THE JIANGHAN BASIN

The bulk-rock analysis technology of organic petrology was used in this paper to systematically study the maceral composition, hydrocarbon-generating components and organic thermal-evolution of the Lower Tertiary source rock in the Jianghan Basin. The morphologic maceral content of source rock in the Jianghan Basin is apparently on the low side. On an average, it only takes 1.5 percent of the whole rock volume. Sapropelite is rich in the maceral composition, vitrinite and exinite are relatively developed, and inertinite is poor. The organic matter is dominated by Ⅱ and Ⅰ types. Alginite and mineral bituminous matrix are the main hydrocarbon ge nerating componets of this area. By using vitrinite reflectance and the fluorescence parameters of hydrogen enriched components and non hydrocarbon fractions, the evolutionary characteristics of organic matter in the source rock of the Jianghan Basin were discussed, and the classification scheme of thermal-evolutionary stages for the organic matter was suggested.