Zonal distribution of seepage hydrocarbon|induced altered carbonates over oil/gas reservoirs is a common phenomenon observed in the field. The authors considered that the continuous production of CO-2 within the !alteration chimney“ gives rise to a significant difference in physical and chemical properties between its interior and the surrounding country rocks. And it is this difference that has promoted the erosion and precipitation of carbonates, thus leading to the zonal distribution of seepage hydrocarbon|induced altered carbonates over oil/gas reservoirs. This may be a reasonable interpretation of the phenomenon described above. Zonal distribution of seepage hydrocarbon | induced altered carbonates over oil / gas reservoirs is a common phenomenon observed in the field. The authors considered that the continuous production of CO - 2 within the ! Alteration chimney ”gives rise to a significant difference in physical and chemical properties between its interior and the surrounding country rocks. And it is this difference that has promoted the erosion and precipitation of carbonates, thus leading to the zonal distribution of seepage hydrocarbons induced altered carbonates over oil / This may be a reasonable interpretation of the phenomenon described above.