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地质论评  2003 

地史过程中烃源岩有机质丰度和生烃潜力变化的模拟计算

Keywords: 烃源岩有机质丰度成岩作用成熟度生烃潜力排烃效率地史过程

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Abstract:

在同时考察源岩中有机质因生、排烃而损失和无机质因成岩作用而失重的基础上,模拟计算了地史过程中,随有机质类型、初始有机质丰度、成熟度及排烃效率的改变,烃源岩有机质丰度和生烃潜力的变化,探讨了有机碳恢复系数及生烃潜力损失率的可能变化范围。结果表明,地史过程中,有机质生烃潜力和有机质丰度的变化主要取决于源岩的生、排烃效率,对性质偏差的有机质,有机质的实测丰度随演化程度的增高不降反升;而对位于高成熟阶段的优质有机质,有机碳的恢复系数可达2以上;随有机质类型变好和成熟度升高,生烃潜力损失率增高;一般情况下,有机质生烃潜力的恢复幅度比有机质丰度的恢复大得多。

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