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首页> 外文期刊>Contributions to Mineralogy and Petrology >Effect of faceting on pore geometry in texturalfy equilibrated rocks: implications for low permeability at low porosity
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Effect of faceting on pore geometry in texturalfy equilibrated rocks: implications for low permeability at low porosity

机译：刻面对构造平衡岩石中孔隙几何形状的影响：对低孔隙度低渗透率的影响

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摘要

The pore geometry of texturally equilibrated rocks is controlled by the interfacial energy ratio between grain boundaries and solid-liquid boundaries. Faceting at pore walls, which is a common feature of pore networks in rocks, strongly affects the liquid distribution. We investigated the effects of faceting on the equilibrium pore geometries based on image analysis of several systems with various degrees of faceting and dihedral angles. The degree of faceting was assessed by the F value, which is the ratio of the flat interface length at the pore wall to the length of total interfacial boundary between solid and liquid. The F values tend to increase with increasing liquid volume fraction. Little-faceted systems show relatively homogeneous liquid distribution. Moderately-faceted systems with a higher dihedral angle (approx 55 deg) are characterized by development of large pores surrounded by faceted walls and complementary shrinkage of triple junction tubes, whereas strongly faceted systems with a low dihedral angle show no evidence of shrinking triple junction tubes, although most pores are surrounded by faceted pore walls. The faceted systems tend to produce more facet boundaries at the pore walls due to the difference of interfacial energies between the flat and curved surfaces. In the systems with the same degree of faceting, heterogeneity of liquid distribution tends to decrease with dihedral angle. For faceting systems, the permeability of texturally equilibrated rocks with low liquid fraction would be significantly decreased by the relative reduction of triple junction volumes or by closure of channels along grain edge due to the truncation of facet walls.
机译：纹理平衡岩石的孔隙几何形状受晶界和固液界之间的界面能比的控制。孔壁上的刻面（这是岩石中孔隙网络的共同特征）会严重影响液体的分布。我们基于对具有不同刻面度和二面角的几个系统进行图像分析，研究了刻面对平衡孔几何形状的影响。刻面度由F值评估，F值是孔壁平界面长度与固体和液体之间总界面边界长度的比值。 F值倾向于随着液体体积分数的增加而增加。小面系统显示出相对均匀的液体分布。具有较高二面角（约55度）的中面系统的特征是，大的孔被多面壁包围，并且三联结管互补收缩，而具有低二面角的强面系统则没有证据表明三联结管会收缩，尽管大多数毛孔被多面孔壁包围。由于平坦表面和弯曲表面之间的界面能的差异，多面体系倾向于在孔壁处产生更多的多面边界。在具有相同小平面度的系统中，液体分布的异质性倾向于随着二面角而降低。对于刻面系统，由于三重接合体积的相对减少或由于小面壁的截断，沿晶粒边缘的通道关闭，具有低液体分数的质地平衡岩石的渗透性将显着降低。

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