摘要
柴达木盆地涩北气田是典型的疏松砂岩气藏,该类气藏为边水驱动,气藏内含有零星分布的夹层水(层间水和层内水),其原始气水分布关系较为复杂。通过对涩北气田疏松砂岩气藏储层孔隙结构特征的研究,分析了储集空间形态、岩石润湿性及气藏成藏机理对原始气水分布的影响。结果表明:储集空间形态通过毛细管压力对原始气水分布起到一定的控制作用,对于孔隙结构较差、以细小孔隙为主、孔隙和喉道半径较小且分选性较差的储层,由于气水分异作用的减弱,从而形成较长的气水过渡带;反之,则气水过渡带较短;岩石的润湿性以及气藏成藏机理也是造成疏松砂岩气藏复杂气水关系的主要影响因素。
Sebei Gasfield in Qaidam Basin is the most typical loose sandstone gas reservoir all through the world.This type of gas reservoir is flank water drive,and interbedded water(interlayer water and intrastratal water) distributes fragmentarily in the reservoir,so the primitive relation of gas and water is very complex. After the research of pore structure of the loose sandstone gas reservoir in Sebei,the influences of reservoir conformation,rock's wettability and accumulation mechanism on primitive distribution of gas and water were analyzed.It is proved that the reservoir space form has certain effect on the distribution of original gas and water through the capillary pressure.The reservoir with worse structure,mini-pore,smaller throat radius and worse separation would form a longer transition band of gas and water because of the weakening of differentiation action between gas and water;on the contrary,a shorter one would be formed.Simultaneously,rock wettability and accumulation mechanism are also main reasons resulting in the complex primitive distribution of gas and water in Sebei.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2009年第3期73-75,共3页
Petroleum Geology and Recovery Efficiency
关键词
疏松砂岩
气水分布
储集空间
润湿性
成藏机理
毛细管压力
loose sandstone
distribution of gas and water
reservoir space
wettability
accumulation mechanism
capillary pressure
