有机质初次生烃升温速率对二次生烃的控制作用

Control role of primary hydrocarbon temperature-increasing velocity of organic matter to the secondary hydrocarbon generation

对不同升温速率下加水热模拟残余样品热解生烃动力学特征进行了分析,并就初次生烃时的升温速率对残余有机质成烃动力学特征的影响进行了研究。结果表明,初次生烃时较慢的升温速率有利于烃类的初次生成,而残余有机质的二次生烃潜力明显降低,二次生烃时的启动温度增加;初次生烃时较快的升温速率不利于烃类的初次生成,但残余有机质二次生烃潜力大,再次生烃时的启动温度降低。通过模拟条件与实际地质条件的对比分析认为,在地质条件下也存在上述规律。在确定不同地区、不同地质时期的构造演化和地温变化情况下,可以对烃源岩的初次生烃量和二次成烃潜力进行合理的分析。

By the analysis of hydrocarbon-generating dynamic parameters of residual organic matter in hydropyrolysis of different temperature-increasing velocity, the influences of temperature-increasing velocity of the primary hydrocarbon on dynamic characteristics were researched. At the lower velocity of temperature increase, the hydrocarbons can be formed advantageous- ly, the secondary hydrocarbon-generating potential of residual organic matter decreases and the beginning temperature of secondary hydrocarbon generation increases. At the higher velocity of temperature increase, the hydrocarbons can be formed disadvantageously, the hydrocarbon-generating potential of residual organic matter elevates and the beginning temperature of secondary hydrocarbon generation descends. The contrast analysis of thermal simulation to actual geological condition shows that this rule exists in geological history. According to the research result of tectonic evolution and paleotemperature variation, the amount and the potential of secondary hydrocarbon generation of residual organic matter can be analyzed rationally.