Abstract
The influence of porosity on the transport properties of rock salt was investigated on a set of artificial porous rock salt samples. The porosities of the samples range from 5% to 42%. To study the influence of compaction on the pore space structure, five samples representing the investigated porosity range were used to produce thin sections for the analysis of the pore geometry. Permeabilities and electrical formation resistivity factors were measured with a saturated salt solution as pore fluid at room temperature and room pressure. Both properties show a strong correlation to porosity. Permabilities and formation resistivity factors were used in conjunction with the microscopical observations of the mean pore sizes to derive a parameter describing the influence of the constrictions of the transport paths. It is shown that the influence of increasing constrictivity on the transport properties is much stronger than that of decreasing porosity for the mechanically compacted samples.
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