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长期以来,柴达木盆地冷科1井井深4666m~5200m井段地层的时代归属存在侏罗纪、石炭纪和三叠纪之争。为了进一步明确该套地层的地质时代,消除混乱,对该套地层及其上覆部分地层(4395m~4666m井段)的岩屑进行了孢粉分析,结果在39块样品中分析出丰富的孢粉化石,孢粉组合面貌基本一致。孢粉组合中,裸子植物花粉居统治地位,占总含量的93.6%以上,以本体无肋纹的两气囊花粉含量为主,占总含量的58.4%~92%;蕨类植物孢子的含量只有0~6.4%,主要是Osmundacidites(0~5.4%);且普遍含库车孢型体(Kuqaia),这两井段地层的时代同属早侏罗世。
For a long time, the strata of well 4686m ~ 5200m in well Lengke-1 in the Qaidam Basin belonged to the Jurassic, Carboniferous and Triassic clashes. In order to further clarify the geologic age of this set of strata and eliminate the confusion, the sporopollen analysis of cuttings in this set of strata and its overlying strata (4395 m ~ 4666 m) resulted in the analysis of abundant spores Fossil, spore and powder combination of the same face. The spore-pollen assemblage dominated the gymnosperm pollen, accounting for more than 93.6% of the total, with the main rib-free two-balloon pollen content accounting for 58.4% -92% of the total content. The fern spore content was only 0 ~ 6.4%, mainly Osmundacidites (0 ~ 5.4%); and Kuqaia is common in these two wells. Both strata of the two wells belonged to the Early Jurassic.