On the whole, TDS and main ion concentration in groundwater in the north of the basin are lower than those in the south of the basin.

• 总体上，白垩系盆地地下水具有盆地北区矿化度和主要离子浓度较低、淡水发育，盆地南区矿化度和主要离子浓度较高、微咸水和咸水发育的分布特点。