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采用高温高压热模拟实验方法 ,开展了原油在砂岩和火成岩储层介质中的加水裂解生气模拟实验研究。结果表明 ,原油开始大量裂解的温度是 40 0℃ ,随模拟温度增加 ,甲烷相对含量增大 ,乙烷以上重烃气尤其是丙烷相对含量减小。其中砂岩的油水混合物裂解生气主要发生在 45 0～ 5 0 0℃之间 ,生气窗范围小 ,对应的烃气产率高 ,火成岩的油水混合物裂解生气主要发生在 45 0～ 6 0 0℃之间 ,生气窗范围大 ,对应的烃气产率小。模拟烃气的组分碳同位素分馏显著 ,随模拟温度增加呈变重趋势。在裂解生气过程中 ,水解加氢和催化作用对烃气的组成、产率和碳同位素分布有重要影响
Using high-temperature and high-pressure thermal simulation experiment method, the simulation experiment of crude oil pyrolysis in sandstone and igneous reservoir was carried out. The results show that the temperature at which crude oil begins to crack is 40 0 ℃. With the increase of simulated temperature, the relative content of methane increases, while the relative content of heavy hydrocarbons above ethane, especially propane, decreases. Among them, the gas-water mixture cracked in sandstone mainly occurred between 45 0 and 500 ℃ with a small range of gas-lift window and a high yield of hydrocarbon gas. The pyrolysis of oil-water mixture in igneous rock mainly occurred at 45 0-600 ℃ Room, angry window range, the corresponding small hydrocarbon gas production rate. The carbon isotope fractionation of components of simulated hydrocarbon gas is significant, showing a trend of heavier weight as the simulated temperature increases. Hydrolysis and hydrogenation and catalysis have an important effect on the composition, productivity and carbon isotope distribution of hydrocarbon gases during pyrolysis