Pore and throat size distributions determined by mercury porosimetry and by direct observation
Pore and throat size distributions determined by mercury porosimetry and by direct observation
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通过水银孔隙率测定法和直接观察确定孔隙和喉部尺寸分布
DOI：
10.1007/bf03174408
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发表时间：
1988
影响因子：
1.4
通讯作者：
Li Yu
中科院分区：
文献类型：
--
作者：
Norman C. Wardlaw;M. Mckellar;Li Yu
根据所选碳酸盐岩样品的汞侵入-挤出毛管压力曲线，确定了孔隙和喉道的尺寸和尺寸分布以及它们之间的相对排列。所获得的结果进行了比较，直接通过观察浸渍有荧光环氧树脂的孔系统，并在高放大倍率下用光学显微镜观察的测量。孔隙度测定法获得的孔径分布是部分分布，排除了捕获汞的较大孔隙。此外，它们表明较小孔隙的体积分数比通过直接观察获得的大。这种差异可能是由于毛细管压力降低时，汞从较大孔隙的表面复杂性中部分排出所致。这也是由于光学分辨率的限制，非常小的孔隙。孔喉尺寸的相关程度可以估计从相对压力的挤出曲线上的端点开始在连续更高的毛细管压力。孔喉尺寸相关性与离散域中较大和较小孔的空间顺序（聚类）有关。扫描环提供了有关孔形状以及前进和后退接触角差异的信息，这些信息是计算孔喉和孔尺寸所需的。
The sizes and size distributions of pores and throats and their arrangement relative to each other have been determined from mercury intrusion-extrusion capillary pressure curves of selected carbonate rock samples. Results obtained are compared with measurements made directly by observation of pore systems impregnated with fluorescent epoxy and viewed at high magnification with an optical microscope. Pore-size distributions obtained by porosimetry are partial distributions which exclude the larger pores in which mercury is trapped. Also, they indicate large volume fractions of smaller pores than are obtained by direct observation. The difference may be caused by partial withdrawal of mercury from the surface complexities of larger pores as capillary pressure is lowered. It is also caused by limitations of optical resolution for very small pores.The degree of pore-throat size correlation can be estimated from the relative pressures of the end points on extrusion curves initiated at successively higher capillary pressures. Pore-throat size correlation is related to spatial order (clustering) of larger and smaller pores in discrete domains.Scanning loops provide information about the shapes of pores and about the differences in advancing and receding contact angles which are required for calculation of throat and pore sizes.