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随着金刚烷类化合物在原油和烃源岩评价方面的广泛应用,它们在原油和烃源岩中的来源、演化、分布等特征也受到了越来越多的关注。在对四川盆地须家河组须五段煤系泥岩进行热裂解模拟实验中发现,金刚烷类化合物主要在等效镜质体反射率(EasyRO)为1.0%~1.5%时生成,在EasyRO>1.5%之后开始裂解。在模拟实验过程中,金刚烷参数MAI、EAI、TMAI-1分别在EasyRO值为1.5%~2.5%、1.0%~2.5%、1.5%~2.5%时与成熟度有良好的相关关系,相关系数R2都在0.784 4以上,说明这些参数可以在此范围内进行成熟度评价。另外,产率比值A/D、MA/MD、DMA/DMD和As/Ds在EasyRO值为1.2%~2.5%时也与成熟度具有良好的相关关系,相关系数R2都在0.923 6以上,说明这些比值也可作为成熟度评价指标。
With the wide application of adamantanes in the evaluation of crude oil and source rock, their origin, evolution and distribution in crude oil and source rocks have also received more and more attention. In the pyrolysis experiment of coal measures mudstone of Xujiahe Formation of Xujiahe Formation in Xujiahe Formation in Sichuan Basin, it was found that adamantane compounds were formed mainly when the equivalent Vitrinite reflectance (EasyRO) was 1.0% ~ 1.5% After 1.5% began to crack. In the simulation experiment, the parameters of adamantane MAI, EAI and TMAI-1 had a good correlation with maturity when the EasyRO values were 1.5% -2.5%, 1.0% -2.5% and 1.5% -2.5% respectively. The correlation coefficient R2 are above 0.784 4, indicating that these parameters can be matured in this range evaluation. In addition, the yield ratios A / D, MA / MD, DMA / DMD and As / Ds also had a good correlation with maturity when the EasyRO value was 1.2% ~ 2.5%, and the correlation coefficient R2 was above 0.923 6, indicating These ratios can also be used as a measure of maturity.