根据对准噶尔盆地南缘古近系安集海河组沉积特征、古生态特征研究并结合粘土矿物、微量元素特点认为,该组沉积早期以浅湖环境为主,湖水盐度相对较小;中期湖泊迅速扩大加深,盐度增大,生物群中喜盐分子繁盛并出现海相藻类化石;末期湖盆收缩并迅速淡化。推断安集海河组沉积中期曾经受到古地中海海水的影响,形成半咸水环境,介形类中Kassinina,Hemicyprideis等喜盐分子发育,同时出现海相沟鞭藻。高盐度水体易于形成湖底缺氧环境,有利于有机质的保存和转化,也最有利于烃源岩的形成。 According to the sedimentary and paleoecological characteristics of the Paleogene Anjihaihe Formation in the southern margin of the Junggar Basin and the characteristics of clay minerals and trace elements, the shallow lake environment and the salinity of the lake are relatively small in the early sedimentation of the group. Expand and deepen, salinity increases, the hippocampus salt community prosperous and marine algae fossils appear; late lake basin shrinks and quickly desalination. It is inferred that the middle reaches of the Anjihaihe Formation had been affected by the ancient Mediterranean seawater and formed a half-saltwater environment. Khatinina, Hemicyprideis and other hi salt molecules developed in the mesogenic category. High-salinity water is prone to form anoxic environments at the bottom of the lake, favoring the preservation and transformation of organic matter and is also most conducive to the formation of source rocks.