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沉积学报  2015 

泥页岩热模拟实验及成岩演化模式

DOI: 10.14027/j.cnki.cjxb.2015.05.021, PP. 1053-1061

Keywords: 泥页岩,热模拟实验,有机质演化,成岩作用,成岩演化模式

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Abstract:

随着泥页岩油气勘探开发的不断推进,对泥页岩的成岩作用研究越来越受到重视。通过对三种不同干酪根类型的泥页岩样品的热模拟实验发现,随着有机质成熟度的增加,干酪根热解生烃产生的有机质孔及不稳定矿物溶蚀孔增加,是泥页岩储集空间增加的主要原因;泥页岩成岩作用类型主要有黏土矿物转化、不稳定矿物溶蚀作用和重结晶作用;结合镜质体反射率,建立了基于热模拟实验的泥页岩综合成岩演化模式。研究表明不同类型的干酪根在生烃过程中演化特征不同,Ⅰ型干酪根以"解聚型"的途径生烃,以产生有机质边缘孔为主;Ⅲ型干酪根以"平行脱官能团型"的途径生烃,以产生有机质内部孔为主;Ⅱ型干酪根介于两者之间,既可以产生有机质内部孔,也可以产生有机质边缘孔。

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