Petrophysical and Capillary Properties of Compacted Salt
Petrophysical and Capillary Properties of Compacted Salt
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DOI：
10.1007/s11242-005-2848-1
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发表时间：
2006-08
影响因子：
2.7
通讯作者：
Y. Cinar;G. Pusch;V. Reitenbach
中科院分区：
文献类型：
--
作者：
Y. Cinar;G. Pusch;V. Reitenbach
本文报道了压实盐的岩石物理特征和毛细管特征的实验结果。测试数据包括孔隙度、气体渗透率、孔径分布、比表面积、气-卤水渗透率和毛管压力。实验中使用的盐样是通过在高应力下压实氯化钠颗粒几个小时来制备的。它们代表了原地条件下碎盐的中间固结阶段。压实盐的孔隙度和渗透率与在盐岩中挖掘的废物库回填区域的预期趋势相似。在本研究考察的范围内，测得的孔隙度和渗透率之间的相关性似乎与压实参数无关。这种相关性也显示出与岩盐不同的行为。各项岩石物性数据表明，裂隙渗透率模型比毛细管束模型更能描述压实盐的孔隙结构。在全盐水饱和压实盐样上进行的简单蠕变试验，得到的应变率与由全盐水饱和颗粒盐试验建立的稳态力学模型得到的应变率相似。针对受材料蠕变影响的恢复状态毛管压力数据，提出了一种改进的计算方法。通过将Brooks-Corey和van Genuchten模型与测量数据进行匹配，确定了压实盐毛细行为的特征参数。用不同方法确定的Leverett函数吻合较好。
This paper reports experimental results that demonstrate petrophysical and capillary characteristics of compacted salt. The measured data include porosity, gas permeability, pore size distribution, specific surface area, and gas-brine breakthrough and capillary pressure. Salt samples employed in the experiments were prepared by compacting sodium chloride granulates at high stresses for several hours. They represent an intermediate consolidation stage of crushed salt under in-situ conditions. The porosity and permeability of compacted salt showed similar trends to those expected in backfilled regions of waste repositories excavated in salt rock. The correlation between the measured porosity and permeability seems to be independent of the compaction parameters for the range examined in this study. The correlation also shows a different behaviour from that of rock salt. The data of all petrophysical properties show that the pore structure of compacted salt can be better characterized by fracture permeability models rather than capillary bundle ones. Simple creep tests, conducted on the fully-brine-saturated compacted salt samples, yielded similar strain rates to those obtained by a steady-state mechanical model developed from the tests on fully brine-saturated granular salt. A modified procedure is proposed for the evaluation of restored-state capillary pressure data influenced by the material creep. The characteristic parameters for the capillary behaviour of compacted salt are determined by matching the Brooks-Corey and van Genuchten models with the measured data. The Leverett functions determined with different methods agree well.