GC-MS-MS 方法检测时代相关生物标志物及地质意义

利用色谱-质谱-质谱(GC-MS-MS)方法在辽河与塔里木盆地源岩和原油样品中,检测出了多个系列时代相关及特定种属生物标志物,包括:降胆甾烷系列、甲基甾烷及甲藻甾烷系列、三环二萜烷及四环二萜烷系列、六环藿烷及甲基藿烷系列等等,这些化合物很难用常规GC-MS方法检测到。以往认识的许多中生代以后才出现的生物标志物却在塔里木盆地寒武系源岩中有高含量分布,其先驱物的繁盛时代有可能推至更古老的寒武纪生物大爆发时代,GC-MS-MS方法检测出的特定种属和时代意义生物标志物参数提供了分子证据,并很好地区分了塔里木盆地寒武系与中-上奥陶统原油,在争议已久的塔里木油源问题研究中发挥了重要作用。

The Age-Related Biomarkers Tested by GC-MS-MS Technologies and Their Geological Significances

By means of GC-MS-MS method, the multiple series of age-related and taxon specific biomarkers are tested in source rocks and oil samples from Liaohe oilfield and Tarim basin, which are hard to be detected by conventional GC-MS method. They are steranes, methylsteranes, Trieyelie and tetracyelie diterpanes, methyl hopanoid alkanes and hexaeyelie hopanoid alkanes, etc. High content of norsteranes and Dinosteranes that were found after Mesozoic broadly occurred in Cambrian source rocks in Tarim basin, postulating that the precursors might even exist in the period of Cambrian biologic explosions. These molecular evidences and age-related significance given by GC-MS-MS method have been used for distinguishing the crude oils of Middle-Upper Ordovieian from Cambrian in Tarim basin, playing an important role in approach to Tarim oil sources that have disputed for a long time.