irreducible water saturation

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.

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；

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Secondarily interpreted log data on porosity(φ), shale content ( Vsh), mid-value ( Md) of grain size, irreducible water saturation ( Swi) and so on along with the BP neural net are used to predict the permeability.

结合测井资料二次解释的孔隙度（φ）、泥质含量（Vsh）、粒度中值（Md）、束缚水饱和度（Swi）等资料，借助BP网络对渗透率进行预测。

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By diagenesis compaction and filling of clays, the formation of the reservoir is characterized by small pore throat radius, complex pore structures, rich irreducible water saturation, and small resistivity difference between oil layer and water layer.

后经成岩压实作用及粘土矿物的充填，造成孔喉半径变小，孔隙结构复杂，孔隙空间对水的滞留能力加强，束缚水饱和度高，油层与水层电阻率差别减小，电阻率增大指数小于3。

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