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本文通过对纯烃类化合物——正十八烷的动力学模拟实验,阐述了正十八烷裂解过程中气态烃组分及其同位素的演化特征,获得了产自正十八烷的甲烷生成动力学参数。运用动力学参数将模拟实验结果外推到地质条件下,表明由烷烃裂解形成的甲烷主要生成于150～200℃(Easy%Ro介于1.0%～2.0%)的范围,裂解产生的甲烷、乙烷、丙烷的碳同位素分馏效应与Easy%Ro的关系曲线受升温速率的影响,不能直接应用于地质条件。
In this paper, through the kinetic simulation of pure octane-octadecane, the evolution characteristics of gaseous hydrocarbon components and their isotopes during the n-octadecane cracking process are expounded. Methane production from n-octadecane Kinetic parameters. The kinetic parameters were used to extrapolate the simulation results to the geological conditions, indicating that the methane formed from the cracking of alkanes mainly forms in the range of 150-200 ℃ (Easy% Ro is 1.0% -2.0% The relationship between carbon isotopic fractionation of propane and Easy% Ro is affected by the heating rate and can not be directly applied to the geological conditions.