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碳酸盐岩成烃有机质丰度下限值的确定,涉及到盆地实际资料的统计,以及源岩有机质类型、热成熟度、矿物组成、古地温、生储配置关系等诸多因素。提出了一种具有实验依据的高、过成熟碳酸盐岩原始有机质丰度及生烃潜力恢复法,经在我国一些盆地下古生界海相源岩中使用,效果良好。海相镜质体形成机制的研究揭示,同一生源前生物(菌、藻),因其沉积环境和演化途径不同,可形成地化性质完全不同的地质聚合物。首次提出了利用固体~(13)C 核磁共振波谱获得的干酪根中的芳核平均结构尺寸 X_b 作为前泥盆纪碳酸盐岩有机质热成熟度的新衡量标尺。自然演化与热压模拟两个系列的对比研究表明:脂族碳是干酪根热降解成烃的主要贡献者,油潜力碳在热演化过程中呈“三段式”的阶段变化特征。利用固体~(13)C 核磁共振波谱所提供的不同母质类型和不同演化阶段干酪根中各类结构组成的碳分数变化特征,不仅可揭示油气生成机制及过程,还可对各类源岩生成油气的定量研究提供新的途径。
The determination of the lower limit of organic matter abundance of carbonate rocks involves many factors such as the actual data of the basin, the types of organic matter, thermal maturity, mineral composition, paleogeothermal and the relationship between the reservoir and the reservoir. A method of recovering the abundance of original organic matter and hydrocarbon generation potential of high and over mature carbonate rocks with experimental evidence is proposed. It has been proved to be effective by using the Paleozoic marine source rocks in some basins of China. The study on the formation mechanism of marine vitrinites revealed that the same biological precursor organisms (bacteria and algae) could form geo-polymers with completely different geochemical properties because of their different depositional environments and evolutionary pathways. For the first time, the average size of aromatic nuclei in kerogen, X_b, obtained by solid ~ (13) C nuclear magnetic resonance spectroscopy was proposed as a new measure of thermal maturity of organic matter in the Pre-Devonian carbonate rocks. Two series of comparative studies of natural evolution and thermo-compression simulation show that aliphatic carbon is the main contributor to thermal degradation of kerogen, and oil potential carbon shows a “three-stage” phase change during thermal evolution. The characteristics of carbon fraction in different types of kerogen and different compositional stages of kerogen provided by solid ~ (13) C nuclear magnetic resonance spectrum can not only reveal the mechanism and process of hydrocarbon generation, but also generate various types of source rocks Quantitative research on oil and gas provides a new way.