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华南地区下二叠统的层状硅岩分布较稳定，厚度一般为几十米，含有数量不等的放射虫和海绵骨针等，并据此可分为放射虫硅岩、海绵骨针硅岩和贫化石硅岩。化学成分特点和硅氧同位素值，具有生物化学成因硅岩的特征，与火山成因和热水成因的硅岩也有一定联系。层状硅岩的形成明显受断裂控制，硅质生物、上升洋流和水平洋流则是硅质富集、保存和沉淀的主要因素，而海底火山和热水活动的参与也起到一定促进。层状硅岩中有机碳含量丰富，平均０．６９％，是潜在的有利烃源岩
The distribution of stratiform silica in the Lower Permian in South China is relatively stable with tens of meters in thickness and contains a large number of radioactive insects and sponge spicules. According to this, it can be divided into radiolarian silica rock, Rocks and depleted silicic rocks. Characteristics of chemical composition and the value of silicon and oxygen isotopes, with biochemical genetic characteristics of silicon rocks, and volcanic origin and causes of hydrothermal silica rock also has some connection. The formation of stratiform silica is obviously controlled by faults. Siliceous organisms, upwelling currents and horizontal ocean currents are the main factors for the enrichment, preservation and deposition of siliceous rocks, and the participation of submarine volcanoes and hot water activities also play a certain role. Rich in organic carbon in layered silicites, with an average of 0.69%, are potential favorable source rocks