In cycled lithologic sections of argillaceous dolomite and coarse texture algae dolomite, reservoir and non-reservoir alternately appear, which make pores and caves growing along the layer.

Organic extraction was conducted for copper from the purple argillaceous-arenaceous dolomite in the Dongchuan copper mine.

Its lithology is primarily argillaceous limestone, and the physical property can improve along with dolomite content's increasing;