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为了揭示原油裂解生气过程,用热模拟实验方法研究了不同原油裂解生烃特征与演化规律.采用50MPa压力下封闭体系黄金管原油热解实验,使用气相色谱定量、色谱-同位素质谱分析,研究了塔里木盆地牙哈和哈得原油样品热解生烃产率、碳同位素特征及其生气过程.提出原油裂解生气潜力大,在高演化阶段仍有较大的生气产率,发现了原油裂解生气的“二段式”演化过程.结果表明:牙哈、哈得原油样品具有很高的总气产率,C1-5产率分别达738.87mL/g,598.98mL/g;随热解温度升高,牙哈、哈得原油样品热解生成的甲烷和沥青产率不断增加,C2-5和C6-14产率先增加后减少,C14+产率不断降低,δ13C1值先变轻后变重,δ13 C2,δ13 C3值逐渐变重;原油裂解生气过程划分为两个阶段,第1阶段以液态烃裂解成湿气为主,第2阶段为C2-5烃气裂解成甲烷和沥青.分析不同原油样品裂解生烃特征与生气过程,有助于研究原油裂解生烃机理.
In order to reveal the process of cracked crude gas generation, the thermal simulation experiment was used to study the hydrocarbon generation and evolution of different crude oil pyrolysis.Using 50MPa pressure closed tube gold tube crude oil pyrolysis experiments, using gas chromatography quantitative and chromatographic-isotope mass spectrometry analysis Hydrolytic hydrocarbon generation rate, carbon isotope characteristics and gas generation process of Yaha and Hud crude samples from Tarim Basin are presented. It is suggested that there is a large potential for gas generation from crude oil cracking and high gas generation rate at high evolution stage. The results show that the samples of Yaha and Hade crude oil have a high total gas production rate of 738.87mL / g and 598.98mL / g, respectively. With the pyrolysis temperature The yields of methane and bitumen produced by pyrolysis of crude oil from Kazakhstan, Kazakhstan and Kazakhstan have been increasing. The yield of C2-5 and C6-14 first increases and then decreases, while the yield of C14 + declines continuously. The value of δ13C1 becomes lighter and then becomes heavier, The δ13C2, δ13C3 values gradually become heavier and heavier. The cracking process of crude oil is divided into two stages, the first stage is liquid hydrocarbon cracking to moisture, and the second stage is C2-5 hydrocarbon cracking to methane and bitumen. Crude oil samples pyrolysis hydrocarbon generation characteristics and angry process, Raw hydrocarbon oil cracking assist mechanism study.