单冷阱热解色谱仪在烃源岩评价中的应用

利用单冷阱热解色谱仪对烃源岩样品进行热解分析,通过电磁切割和冷阱富集的匹配,能实现烃源岩不同演化阶段热解生烃组分色谱分析,气态烃也得到很好分离,从而为烃源岩组分动力学研究提供了技术保障。对不同类型烃源岩的热解分析表明,烃源岩从Ⅰ型到Ⅲ型有机质,甲烷产率快速增加,而轻质油和重质油则逐渐减少,湿气与有机质类型关系不明确,产率变化不大;烃源岩热解产物正烷烃与正烯烃的比值受到热解速率、烃源岩演化阶段及类型的综合影响,不能简单地以烃源岩热解正烷烃与正烯烃的比值来确定有机质类型。建立的烃源岩热解生烃组分动力学分析技术能提供包括C₁(干气)、C₂—C₄(湿气)、C₅—C₁4(轻质油)和C₁₅₊(重质油)的动力学数据,从而为烃源岩定量评价、确定其主成油期、主成气期、油气比和资源量计算提供了重要技术参数。 

Application of single cold trap pyrolysis chromatography in source rock evaluation

By means of single cold trap pyrolysis chromatography,the pyrolysis analyses of source rock samples have been carried out.Combining electromagnetic cutting with cold trap enrichment,the hydrocarbon components of source rock during different mature stages have been analyzed with pyrolysis chromatography,and gaseous hydrocarbon has been separated well,providing technical supports for dynamic studies of source rock components.As to different types of source rock,from type Ⅰto Ⅲ of organic matter,the yielding rate of methane increases rapidly while the yielding rates of light and black oils decrease gradually,and the yielding rate of wet gas does not change obviously no matter which organic types it belongs to.The n-alkanes/n-alkenes ratios of pyrolysis product of source rock are controlled by pyrolysis rate,source rock evolution stage and type,hence the ratio can not be used to judge organic matter type.The dynamic analyses of hydrocarbon pyrolysis component in source rock provide data including C1(dry gas),C2-C4(wet gas),C5-C14(light oil) and C15+(black oil),offering important parameters for source rock quantitative evaluation,oil and gas major generation stage determination as well as the calculation of oil/gas ratio and total resource.