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首页> 外文期刊>Journal of earth system science >A practical solution in delineating thin conducting structures and suppression problem in direct current resistivity sounding
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A practical solution in delineating thin conducting structures and suppression problem in direct current resistivity sounding

机译：描绘薄导电结构的实用解决方案和直流电阻率测深中的抑制问题

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In hard rock areas, conventional apparent resistivity measurement using Schlumberger resistivity sounding fails to detect thin conducting structures (2-D and 3-D fractures filled with groundwater and mineral aggregate) concealed at a large depth. In the present study, an attempt is made to way-out the detection problem of deep seated thin conducting layer. It is proposed to study the apparent conductance simultaneously with resistivity sounding to detect such conductive zones qualitatively. Apparent conductance is defined as the magnitude of current flowing in the subsurface for a unit applied voltage through current electrodes. Even though such measurement is of qualitative importance, it gives extremely valuable information for the presence of conductive zones at depth in challenging hard rock terrain. It has been observed that apparent conductance increases significantly when groundwater bearing fractures and conductive bodies are encountered in the subsurface. Field data from different locations are presented to demonstrate the efficacy of such measurement. The measurement assists to the conventional resistivity sounding for successful prediction of groundwater zones at large depth in different hard rock areas and is of enormous importance. The approach is also used for possible solution of suppression problem in the DC resistivity sounding when intermediate layer is not reflected in the resistivity sounding curve. Finally, the approach can be used together with resistivity sounding to solve many practical problems.
机译：在硬岩地区，使用斯伦贝谢电阻率测深仪进行的常规表观电阻率测量无法检测出大面积隐藏的薄导电结构（充满地下水和矿物聚集体的2-D和3-D裂缝）。在本研究中，试图解决深层薄导电层的检测问题。建议与电阻率探测同时研究视在电导率，以定性检测此类导电区域。表观电导率定义为通过电流电极施加的单位电压在地下流动的电流的大小。即使这种测量在质量上很重要，它仍可为极具挑战性的坚硬岩石地形中深处存在导电区域提供极其有价值的信息。已经观察到，当在地下遇到含地下水的裂缝和导电体时，表观电导会显着增加。呈现了来自不同位置的现场数据以证明这种测量的有效性。该测量有助于常规的电阻率测深，以成功预测不同硬岩区域中大深度的地下水带，这非常重要。当中间层未在电阻率测深曲线中反映时，该方法也可用于解决直流电阻率测深中的抑制问题。最后，该方法可以与电阻率测深一起使用，以解决许多实际问题。

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