Porosimetry of vesicular volcanic products by a water‐expulsion method and the relationship of pore characteristics to permeability
Porosimetry of vesicular volcanic products by a water‐expulsion method and the relationship of pore characteristics to permeability
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DOI：
10.1029/2008jb005758
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发表时间：
2009-02
影响因子：
--
通讯作者：
T. Yokoyama;S. Takeuchi
中科院分区：
文献类型：
--
作者：
T. Yokoyama;S. Takeuchi
[1]利用排水法对孔洞火山产物进行了孔隙度测量，研究了孔隙特征与气体渗透率的关系。岩石中的孔隙可分为完全孔隙、连通孔隙、运输孔隙、死端孔隙和孤立孔隙。气体流动仅发生在传输孔中，但不提供流动路径的孔包括在总孔隙率和连通孔隙率中。渗透率与总孔隙度、连通孔隙度和运移孔隙度的相关性较弱。确定了特征最大孔喉半径Rch(M)。Rch和运移孔隙度都与渗透率K1(M2)有很好的相关性，符合下面的Kozeny-Carman关系式：K1=0.0022ϕtrarch2。因此，渗透率强烈地依赖于孔隙大小，而估算孔隙大小对于了解泡孔火山产物的渗透性是必不可少的。
[1] Porosimetry of vesicular volcanic products was conducted by a water-expulsion method to investigate the relationship between pore characteristics and gas permeability. The pores in a rock were categorized as total, connected, transport, dead-end, and isolated pores. Gas flow takes place only through the transport pores but the pores that do not provide a flow path are included in both total and connected porosities. Permeability correlated weakly with total porosity, connected porosity, and transport porosity. The characteristic maximum pore-throat radius rch (m) was also determined. Both rch and transport porosity correlated well with permeability k1 (m2) according to the following form of the Kozeny-Carman relation: k1 = 0.0022ϕtrarch2. Permeability is thus strongly dependent on pore size, and estimation of pore size is essential for understanding the permeabilities of vesicular volcanic products.