An experimental study of salt/heat transport in a fracture-matrix system based on the resistivity method
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摘要:
为探究盐、热示踪剂在裂隙-基质中示踪的有效性，设计了充填裂隙-基质试验模型，开展了不同示踪剂下的试验，结合不同测点的实时动态电阻率监测数据，研究充填裂隙-基质中示踪剂运移过程，并讨论基于电阻率法的盐、热示踪的有效性结果表明：（1）电阻率法可以揭示 3 种不同示踪剂注入充填裂隙-基质系统的过程以及裂隙-基质系统中裂隙的存在；（2）盐热示踪剂下裂隙与基质内的体积电导率变化率差异最为显著；（3）质量浓度与体积电导率拟合效果要优于温度与体积电导率拟合效果。这说明了基于电阻率法的示踪剂对刻画裂隙-基质中裂隙与基质位置的有效性，且盐热联合示踪剂效果最好。数据成果对野外电法勘探裂隙位置及其他非均质地层构造研究具有一定的参考价值。
Abstract:In order to explore the effectiveness of salt and heat tracers in a fracture-matrix system, a fracture-matrix test model is designed. The tracer tests with different tracers are carried out. The transport process of tracer is described in the fracture-matrix with the real-time dynamic resistivity monitoring data at different measuring points, and the effectiveness of salt and heat tracers based on the resistivity method is discussed. The results show that the process of injecting three different tracers into the fracture-matrix system and the existence of fracture can be seen by the resistivity method. Under the salt-heat tracer, the difference between the volume conductivity in the fracture and the matrix is the largest, and the change rate of the volume conductivity in the fracture and the matrix decreases with the increasing depth. The fitting effect of concentration and volume conductivity is better than that of temperature and volume conductivity. These indicate that the tracer based on the resistivity method is effective in describing the positions of the fracture and matrix in the fracture-matrix system, and the salt-heat combined tracer has the best effect. The results are of certain reference for the field electrical exploration of the positions of fractures and other heterogeneous layers.
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Key words:
- fracture-matrix system /
- salt heat tracer /
- tracer test /
- resistivity method
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表 1 材料参数表
Table 1. Parameters of materials
平均粒径/mm 真密度/（g·cm−3） 孔隙率/％ 渗透系数/（m·s−1） 石英砂类别[28] 3.000 2.52 53 5.5×10−4 粗砂（6～7目） 0.270 2.68 48 8.9×10−6 细砂（30～40目） 0.128 2.67 42 4.8×10−7 特细砂
（80～100目）0.092 2.74 38 4.2×10−8 特细砂（140～160目） 
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表 2 盐热示踪试验的参数设置
Table 2. Parameters setting for thermal and solute tracer experiments
基质填充 试验 示踪剂 温度/°C 质量浓度/（g·L−1） 电导率/（μS·cm−1） 30～40目 1 热 80 0 220 2 盐 25 1 2 017 3 盐热 80 1 2 532 80～100目 4 热 80 0 228 5 盐 25 1 2 011 6 盐热 80 1 2 492 140～160目 7 热 80 0 218 8 盐 25 1 2 023 9 盐热 80 1 2 562
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