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松辽盆地白垩纪青山口组下部分布一套富含有机碳的黑色泥岩、页岩和油页岩沉积,是全盆地划分泉头组与青山口组的一级标志。茂206井青山口组黑色泥岩、页岩的地球化学特征研究表明:它具有相对高的有机碳、干酪根碳同位素正偏、重排甾烷含量低,普遍存在伽玛蜡烷生物标志化合物等有机地球化学特征,表征为白垩纪温室效应时间窗内古湖泊缺氧事件的产物。而青山口组底部出现的一些具重要时代意义的被子植物花粉,也证实了青山口组底界已属Turonian期,而非Ceno-manian期。
Lower Cretaceous Qingshankou Formation in the Songliao Basin A set of black mudstone, shale and oil shale deposits rich in organic carbon are distributed in the lower part of the Qingshankou Formation in the Cretaceous. The geochemical characteristics of the black mudstone and shale in the Qingshankou Formation in the Mao 206 well indicate that it has a relatively high content of organic carbon, positive carbon offset of kerogen, low content of rearrangement steranes, and widespread presence of biomarkers of gamma-alkanes Organic geochemical characteristics, characterized by the Cretaceous Greenhouse effect time window ancient anoxic hypoxia products. The occurrence of some important epoch-forming angiosperm pollen at the bottom of the Qingshankou Formation also confirms that the bottom boundary of the Qingshankou Formation is Turonian rather than Ceno-manian.