摘要
作者在对不同类型有机质的热模拟实验中,发现不同类型有机质经过相同热演化后,它们之间镜质体反射率(R°)差异较大,同温阶的R°差值可达0.24—0.60。低温阶段(<360℃),Ⅱ型比Ⅲ型的镜质体反射率偏低,而高温阶段(>360℃)则相反。这种现象与自然剖面的观察结果相符,说明镜质体反射率受母质类型影响。鉴此可认为,镜质体反射率作为成熟度“标尺”只对同类型有机质有效,不同类型之间堆以进行对比,不能作为通用“标尺”应用,需要进行校正。
Through thermal simulation experiments on organics of different types, the authors found that there were much difference in vitrinite reflectance for different organics subjected to same thermal evolution. The difference for R°could reach as much as 0.24-0.60 with same thermal gradient. At low thermal stage ( 360℃ ) , the values of R° for type I were lower than those for type Ⅲ ;and at high thermal stage, with contrary results come about.
This phenomena tallies with the observations from field sections, suggesting that vitrinite reflectance is influenced by the type of parent material. In view of above-mentioned facts,vitrinite reflectance as a general 'criterion' for maturity can be applicable only for the same kind of organics, but it is difficult to use it in comparisions of different types of organics, therefore it can not be taken as a general 'criterion', and correction need to be made.
出处
《石油实验地质》
CAS
CSCD
北大核心
1990年第4期421-425,共5页
Petroleum Geology & Experiment
