Low resistivity pays resulting from the added conductivity of shales are controlled by the active blets of volcanos rich in rags and tuff, which leads to the aggregation of montmorillonite.

• 在火山运动活跃的地带，火山碎屑和凝灰岩的富集有利于蒙皂石的富集，从而形成泥质附加导电成因的低阻油层。