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通过对桂中坳陷泥盆系野外地质剖面的实际丈量和烃源岩样品的室内分析,完成了桂中坳陷泥盆系烃源岩岩石类型、地层厚度和分布的调查及总体有机地球化学特征的分析,在此基础上详细论述了各层位烃源岩特点,指出了泥盆系的主力烃源岩层段。研究结果表明:桂中坳陷泥盆系是以海相碳酸盐岩为主的连续地层,平均有机质丰度偏低,有机碳含量平均值为O.21%;有机质类型以Ⅰ型干酪根为主,部分为Ⅱ_1型;镜质组反射率为0.937%～2.03%,有机质总体上处于成熟—过成熟阶段。烃源岩综合评价结果显示:中泥盆统唐家湾组中段是桂中坳陷的主力烃源岩层段,该层段的烃源岩厚度为374.7m,有机碳含量平均值为0.29%,有机质类型以Ⅰ型干酪根为主,镜质组反射率为0.937%～1.115 3%,有机质处于中等成熟阶段。
Based on the actual measurements of the Devonian outcrops and the laboratory analysis of source rocks in the Guizhong Depression, the survey on the types and distribution of the Devonian source rock in the Guizhong Depression and the overall organic geochemistry On the basis of this, the characteristics of source rocks in various layers are discussed in detail, and the main source rocks of Devonian are pointed out. The results show that the Devonian in the Central Guangxi Depression is a continuous carbonate layer dominated by marine carbonates. The average abundance of organic matter is low with an average of 0.21% organic carbon. The organic matter type is Type I kerogen The main part is Ⅱ_1 type. The vitrinite reflectance is 0.937% -2.03%. The organic matter is generally in the maturity-over maturity stage. The comprehensive evaluation of source rocks shows that the middle part of the Middle Devonian Tangjiawan Formation is the main hydrocarbon source rock section of Guizhong Depression with a source rock thickness of 374.7m and an average organic carbon content of 0.29% The type of organic matter is type I kerogen, the vitrinite reflectance is 0.937% -1.1153%, and the organic matter is in the middle stage of maturity.