砂岩储层渗透率与压汞曲线特征参数间的关系

通过对大量岩样毛管压力数据的分析研究发现,在双对数坐标下储层岩石毛管压力曲线呈现明显的双曲线特征,且可用双曲线的两条渐近线Pd和Sb及孔喉几何因子Fg三个参数唯一确定,双曲线的顶点代表了非润湿相在岩石系统中完全占据能有效控制流体流动的那部分有效孔隙空间时的状态。且双曲线的位置形状参数或顶点参数决定了岩石绝对渗透率的大小。分别用位置形状参数和顶点参数成功建立了岩石绝对渗透率的估算模型,并用大量实测数据验证了估算模型的可靠性。

RELATIONSHIP BETWEEN PERMEABILITY AND MERCURY INJECTION PARAMETERS CURVE FOR SANDSTONE RESERVOIR

By the analysis of a large number of sample mercury injection capillary pressure data, it is found that capillary pressure curve shows distinct hyperbola characteristics under log-log coordination, and any capillary pressure can only be determined by three parameters, Pd , Sb and Fg. The apex of hyperbola shows the situation where non-wetting phase completely occupy the effective pore spaces controlling fluid flow. The absolute permeability of reservoir rock is determined by the parameters from position and shape and apex of hyperbola .The estimating model of rock absolute permeability is established successfully by position -shape and apex parameters respectively, and its reliability has been proved by plenty of measured data.