莺歌海盆地束缚水饱和度影响因素研究

Influential factors of irreducible water saturation in Yingge-hai

1. 长江大学地球物理系,湖北荆州 434023;2. 中海石油(中国)有限公司湛江分公司,广东湛江 524057

Geophysics Department of Yangtze University, Jingzhou 434023, China

对于不同类型的储层,其束缚水饱和度的影响因素各不相同,因此,利用测井资料求取束缚水饱和度的方 法也不一样。束缚水由毛管束缚水和薄膜束缚水组成,其含量与地层的孔隙结构、岩石性质及形成条件有关。 通过对实验资料的分析,研究了莺歌海盆地束缚水饱和度的影响因素,认为孔喉直径、孔隙结构、粒度、孔隙度和 渗透率以及气柱高度是该地区束缚水饱和度的影响因素;讨论了束缚水饱和度与微观孔隙结构、岩石颗粒粒径、 孔隙度、渗透率以及气柱的关系,认为通过建立束缚水饱和度与孔隙度、气柱高度之间的关系,就可以利用测井 资料来计算束缚水饱和度。

Irreducible water saturation has different influential factors in various reservoirs, so we have to use different method to get it by well-logging data The influential factors of irreducible water saturation in Yinggehai basin are studied by analyzing experiment data. It is concluded that pore throat diameter, pore structure, granularity, porosity, permeability and height of gas column are the influential factors of irreducible water saturation of this area. Granularity is main influential factor. Irreducible water saturation has relationship with height of gas column in pure gas formation. Irreducible water saturation can be calculated with well-logging data by establishing the relationship between irreducible water saturation and porosity and height of gas column.