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运用扫描电子显微镜及能谱分析仪,对鄂尔多斯盆地里57井等钻孔共计49个三叠系延长组长7优质烃源岩(油页岩)样品进行了微体、超微化石的直接观察与研究。发现了6种形态的微体、超微化石,其中有3种超微化石仅在很少的样品中见到,化石数量呈现剧烈变化的特征,记录了在相似古地理环境下一个或多个物种短暂勃发与消亡的演变过程,揭示了湖泊生态系统的灾变现象。检测证实了4种微体、超微化石的体腔内均保存着炭化的原始有机质,厚壁的胶磷矿壳体及薄壁膜壳的快速黄铁矿化是造成生物体腔内有机质完好保存的主要原因。长7期湖泛期古湖泊生态系统的灾变和异常古环境的形成与强烈的区域构造活动相伴随的火山喷发、地震、湖底热液活动等地质事件密切相关。
Using scanning electron microscopy and energy spectrum analyzer, a total of 49 Triassic Yanchang Formation high-quality source rock (oil shale) samples from the No. 57 well in Ordos Basin were directly observed And research. Six kinds of microscopic and superficial fossils were found. Among them, three kinds of superfossils were found in only a few samples. The number of fossils varied sharply, and one or more The rapid evolution and disappearance of species revealed the catastrophic changes in lake ecosystems. It was confirmed that four kinds of micro-organisms were found in the body cavity of the nanofibrils. Carbonized primary organic matter was preserved in the body cavity of the nanofossils. The rapid pyrite mineralization of the thick-walled phosgene shell and the thin-walled membrane shell resulted in the perfect preservation of the organic matter in the body cavity main reason. The catastrophic and anomalous paleoenvironment formation of the paleoenvironment of lacustrine lake in the Chang 7 period is closely related to the geological events such as volcanic eruptions, earthquakes and hydrothermal activities at the bottom of the lake accompanied by the intense regional tectonic activities.