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干酪根晚期生气潜力和原油裂解气的问题关系到海相高-过成熟地区天然气的来源和勘探前景.用高磁场固体13C核磁共振技术研究不同类型和演化程度干酪根的结构和油气潜力碳含量,Ⅰ~Ⅲ型干酪根在高-过成熟阶段气潜力碳含量均较低,表明生气潜力较小,生气数量有限;而低成熟Ⅰ型干酪根油潜力碳含量较高,表明在生油窗阶段大量生油,为后期发生油裂解生气奠定了物质基础.原油生气动力学实验表明,在160℃左右(Ro=1.6%)原油才开始大量裂解形成天然气,主生气期晚于干酪根的,但生气数量是干酪根的2~4倍,这种成因天然气富含甲基环己烷,具有不同于干酪根晚期热降解气的特征.
The potential of kerogen in the later period and the cracked gas of crude oil are related to the source and prospect of natural gas in the high-mature marine areas. The structure and hydrocarbon potential of kerogen with different types and evolution degrees are studied by 13C nuclear magnetic resonance , The carbon potential of type Ⅰ ~ Ⅲ kerogen in the high-mature stage is low, indicating that the potential for gas generation is small and the amount of gas generation is limited. However, the potential carbon content of low maturity type Ⅰ kerogen oil is high, The large amount of oil produced in the stage laid the material foundation for the oil cracking and cracking in the later period.According to the experimental results of crude oil kinetics, crude oil began to massively crack to form natural gas at about 160 ℃ (Ro = 1.6%), However, the number of angry is 2 to 4 times that of kerogen, which is due to the fact that natural gas is rich in methylcyclohexane and has the characteristics of being different from the kerogen in late stage.