Abnormally high CO2 content is unigue only in shale diapirs.And the higher evolution of diapir is , the higher CO2 content would be.

• 异常高的CO_2为泥拱带所独有,并且泥拱演化序列越高泥拱帽CO_2含量越高,断块越小CO_2含量越高,越是靠近断层CO_2含量越高。