In Tazhong area,the Silurian bituminous sandstone are mainly distributed in five sub-structural zones, and in Tabei area,all distributed in regional uplifts of late Caledonian.

• 塔中地区志留系在纵向上分为三个储盖组合。塔中、塔北及柯坪三大古隆起控制着沥青砂岩的分布。