摘要
通过对柴达木盆地第四系高孔隙度、低突破压力和具有一定渗透性的特殊盖层研究后指出:这种特殊盖层封盖天然气的机理在于其中饱和高矿化度的地层水;泥岩盖层中孔隙流体压力同下伏气藏压力值很接近;区域盖层厚度巨大;盖层是源岩层;区内气候寒冷,冰冻期长,冰川广布。
Through the researches onthe special Quaternary cap rock with the characteristics of high porosity, low breakthrough pressure and some permeability in qaidamu Basin, the parper points out that the sealing mechanism of the cap rock lies in the high salty formation water existing inside the cap rock. The fluid pressure in mudstone pores approximately equals to the pressure in gas reservoir below; the thickness of regional cap rock in very high and the cap rock itself belongs to source rock. The cold climate in the region insures a great amount of ice being formed so that the natural gas can be accumulated and preserved.
出处
《天然气地球科学》
EI
CAS
CSCD
2004年第4期383-386,共4页
Natural Gas Geoscience
关键词
柴达木盆地
第四纪
生物气
盖层遮挡(地质)机理
Qaidamu basin
Quaternary
Biologica gas
Cap rock sealing mechanism(geological).
