The Quaternary system is characterized by high geothermal gradient, with low scope of overpressure in its deep and shale caprock saturated with formation water of high salinity.

• 第四系具有较高的地温梯度，深部发育了低幅超压；甘森泉－小柴旦基底断裂影响气藏构造的完整性；第四系饱含高矿化度地层水泥岩构成的盖层可以起到一定的封盖作用。