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研究表明,对厌氧阶段有机质降解程度的研究可以用于评价生物气源岩。通过对松辽盆地北部浅层20块生物气源岩样品常规有机地球化学及镜下观察得出,有机质降解程度与有机质成熟度无相关关系,但与有机质类型相关性极大,Ⅰ类生物气源岩有机质降解程度高达80%以上,Ⅲ类生物气源岩有机质降解程度低,一般低于60%。通过原始藻类有机质在产甲烷菌作用后细菌降解程度、生物气产率(用于计算有机质生物气转化率)实验表明,有机质细菌降解程度与有机质生物气转化率为正相关关系,当有机质降解程度达到80%时,有机质生物气转化率可达40%~50%左右;当有机质细菌降解程度小于10%时,有机质转化率仅为7%。通过有机质降解程度与有机质转化率的关系,可以确定现今未熟生物气源岩原始有机碳的含量。这对评价生物气源岩有重要的意义。
Studies have shown that the study of the degree of degradation of organic matter in the anaerobic stage can be used to evaluate biogenic gas source rocks. Based on the conventional organic geochemical and microscopic observations of 20 biogas source rocks in the northern part of the Songliao Basin, the degree of organic matter degradation was not related to the organic matter maturity, but was strongly correlated with the organic matter types. The type Ⅰ biogas The degree of organic matter degradation of the source rock is as high as 80% or more, and the degree of organic matter degradation of the type Ⅲ biogenic gas source rock is low, generally lower than 60%. The results showed that there was a positive correlation between the degree of degradation of organic matter and the biogas conversion rate of organic matter by the degree of bacterial degradation and biogas production rate (used to calculate the biogas conversion rate of organic matter) of the original algae organic matter after methanogenesis. When the degree of degradation of organic matter At 80%, the biogas conversion rate of organic matter reaches 40% ~ 50%. When the degree of degradation of organic matter is less than 10%, the conversion rate of organic matter is only 7%. Through the relationship between the degree of degradation of organic matter and the conversion rate of organic matter, the content of primary organic carbon in source rock of immature biogas can be determined. This is of great significance for the evaluation of biogas source rocks.