摘要:
文章报道通过与传统的索氏萃取方法的对比，对于加速溶剂萃取（ASE 200）技术用于烃源岩可溶有机质萃取的实验方法研究结果。利用东北地区的1个泥岩样品，探讨了分散度、温度、压力对加速溶剂萃取技术的影响,确定最优化的萃取条件参数：分散度为8∶3、温度110℃、萃取压力10.3 MPa。进行方法的重现性实验, 萃取结果具有很好的精密度，相对标准偏差（RSD，n=10）为2.6%。回收率达到了90%以上。采用吐哈盆地的东深1井的1个油页岩样品,从抽提的有机质、饱和烃和芳香烃组分的量上对加速溶剂萃取与传统索氏萃取进行了方法比较。采用6个样品进一步对饱和烃和芳香烃中的生物标志物进行了对比，加速溶剂萃取的烷烃、萜类、甾烷、芳烃等系列化合物的相对丰度、色谱-质谱特征、有机地化参数指标结果均与经典的索氏萃取的结果相一致。实验结果表明，加速溶剂萃取技术可有效地应用于烃源岩的有机地球化学分析测试及样品前处理。
Abstract:
The application of accelerated solvent extraction (ASE) technique to the extraction of extractable organic matters in source rocks with ASE 200 are discussed by comparing with traditional Soxhlet extraction technique. Based on analytical results of a mudstone sample from northeast China, the effects of dispersion ratio, extraction temperature and pressure conditions on the determination were discussed and the extraction conditions for extracting organic matters in source rocks with accelerated solvent extraction was optimized with dispersion ratio of 8∶3; extraction temperature of 110℃; extraction pressure of 10.3 MPa and heating time of 5 min. Under the optimized experimental condition, the satisfactory result was obtained with recovery rate of higher than 90% and precision of 2.6%RSD (n=10). Additionally, the bulk chemical composition of the chloroform bitumen obtained with accelerated solvent extraction from the Dongshen 1 source rock collected from TuHa Basin of China is also very close to those obtained with soxhlet extraction. The GC-MS analytical results of the aliphatic and aromatic fractions of the extracts from other six source rocks obtained with accelerated solvent extraction and Soxhlet extraction, separately also show very good consistence. The molecular abundances, distribution patterns and geochemical parameters of normal alkanes, polycyclic terpanes, steranes, and aromatic hydrocarbons obtained with both accelerated solvent extraction and Soxhlet extraction are consistent. The results suggest that the accelerated solvent extraction technique can be applied to the extraction of organic matters in source rocks and as the pretreatment method for further organic geochemistry analysis.
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