确定有效储层物性下限的两种新方法及应用——以东营凹陷古近系深部碎屑岩储层为例

Two New Methods Used to Determine the Low Limits of Effective Reservoir Physical Properties and Their Applications——A Case Study on Deep Clastic Reservoir of Palaeogene in Dongying Depression

试油法和束缚水饱和度法是确定有效储层物性下限的两种新方法。试油法是将有效储层和非有效储层对应的孔隙度、渗透率绘制在同一坐标系内,两者分界处所对应的孔隙度值、渗透率值为有效储层物性下限值。束缚水饱和度法是建立束缚水饱和度与孔隙度之间函数关系,取束缚水饱和度为80%时所对应的孔隙度值作为有效储层的孔隙度下限值。两种方法在东营凹陷古近系深层应用效果较好,求取的3000～3200m有效储层孔隙度下限为9%、渗透率下限为0.8×10-3μm2,与分布函数法、测试法计算结果基本一致,说明试油法和束缚水饱和度法具有推广使用的价值。

The formation test method and irreducible water saturation method are two new methods used to determine the low limits of effective reservoir physical properties.The formation test method is that the porosity and permeability of effective and non-effective reservoir are drawn in the same coordinate system,and the values which divided the two above are the low limits of effective reservoir physical properties.Irreducible water saturation method is that the function relation between irreducible water saturation and porosity is established and the 80% value is the low limit of porosity of effective reservoir.The two methods are applied to the determination of the low limits of the deep reservoir of Palaeogene in Dongying Depression.The low limit of the effective reservoir buried between 3000m and 3200m is 9%,and the low limit of permeability of the effective reservoir buried between 3000m and 3200m is 0.8×10-3μm2.the results are confirmed well with the values obtained by the methods,which demonstrates that the two methods are successful and valuable to be introduced.