主要形成了下白垩统半深湖相烃源岩，其次为中下侏罗统煤系烃源岩。
In these process of evolution, it deposited mainly hydrocarbon source rocks of lacustrine facies in the Early Cretaceous and secondary coal measures source rocks in Early-Middle Jurassic.
根据它的地质时代，划分为上三叠统含煤建造和中下侏罗统碎屑岩建造。
According to geological age, it may be divided into Upper Triassic coal-bearing formation and Lower-Middle Jurassic clastic rock formation.
因此，将中下侏罗统确定为本区的主要找矿目标层，下白垩统为次要找矿目标层。
Therefore, the Lower-Middle Jurassic is selected as the main target horizon for sandstone-hosted uranium deposit, and the Lower Cretaceous as the minor one.
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