根据压汞曲线建立砂岩储层渗透率估算模型

岩石的渗透率与孔隙喉道大小及其分布有着直接的关系,而孔隙喉道大小及分布可由毛管压力曲线来确定。根据Purcell提出的渗透率与毛管压力的关系,通过分析研究毛管压力的双曲线特征,建立了一种新的渗透率估算模型。压汞岩心实测数据检验结果表明,模型的参数变化与毛管压力曲线的特征吻合较好,可以较准确地估算出岩石的渗透率。

Establishment of Permeability Estimation Model for Sandstone Reservoir Based on Injection-Hg Capillary Pressure Curve

Permeability of rocks has direct relations with the size and distribution of pore throat, which is determined through the capillary pressure curve. According to the relationship between permeability and capillary pressure introduced by Purcell, a new model of calculating permeability is established based on the analysis of the hyperbolic features of the capillary pressure. The experimental results of the mercury injection capillary pressure show that the rocks permeability can be precisely calculated owing that the parameters variation of the new model is coincided with the features of capillary pressure curves.