以热解特征判别干酪根类型

A NEW METHOD FOR IDENTIFYING KEROGEN TYPES BASED ON PYROLYSIS CHARACTERISTICS

应用热重仪对10余种不同类型试样(包括生油岩、煤及其干酪根)进行了热解试验,总结分析了三种类型干酪根在恒速升温时的热分解特征.其明显的特点是:(1)在热解反应最激烈时,Ⅰ类干酪根反应速率最大,Ⅱ类次之,Ⅲ类最小.(2)反应终止温度与起始分解温度的差值,Ⅰ类最小,Ⅱ类稍大,Ⅲ类最大.对实验结果进行数据处理,归纳成一个无因子群.以此作为一个新的热解类型判别指标,称作热解类型参数.研究发现,这个方法既适用于干酪根,也可用于原岩(即生油岩、油页岩和煤);既可用热重仪实验,也可用岩石评价仪(Rock—Eval).该法所用试样量少,实验时间短,操作简便.

Different kinds of samples, including source rock, oil shale, coal and kerogen, were studied by thermogravimetric analysis with constant heating rate. Weight loss and weight loss vs temperature curves were obtained. There are two main pyrolysis characteristics for three different types of kerogen. First, the reaction rate of type I is the largest, type I is the second, and type I is the smallest. Second, the temperature difference between the end and the beginning of pyrolysis for type I is the smallest, type I is the largest. With these results of the experiments and mathematical calculation, a dimenisonless index called pyrolysis type parameter (PTP) is suggested for identifying kerogen types. This method is simple and convenient for identifying kerogen and source rock with thermogravimetric analysis and rock evaluation method, and only a small amount of sample is needed.