论文部分内容阅读
高密度电阻率成像法(ERT)结合了电剖面法和电测深法的优点,在断裂构造探测方面有其独到的优势.但在ERT实际应用时尚存在电极装置有效性和电极距优化等问题.在西北干旱区还存在接地电阻高而导致无法供电的问题.本文即是针对这三方面问题,选取西北地区一条典型断裂—信泉断裂,开展了实验研究.在垂直于该断裂方向上布设了四条测量剖面,开展了接地电阻降阻、电极装置和电极距实验.实验结果表明:(1)浇入自来水和Na Cl溶液,并使电极与周围介质紧密接触,可以很好的解决新疆干旱地区接地不良的问题(2)ERT不同装置形式和电极距可从不同侧面反应剖面特征,在实际应用中应综合分析不同装置和不同电极距探测结果,以获得丰富的剖面信息(3)信泉断裂的电性特征为:在反演电阻率剖面上有明显的错断,破碎带为低阻板状体异常;断裂上盘低阻层厚度小,下盘低阻层厚度大;断裂西段覆盖层变薄甚至局部地段基岩裸露,断裂中部覆盖层厚度较厚.
The high-density resistivity imaging (ERT) combines the advantages of electrical profiling and electrical sounding and has its unique advantages in fault structure detection. However, there are some problems in the practical application of ERT, such as the effectiveness of the electrode device and electrode spacing optimization In the arid region of Northwest China, there is also a problem of high grounding resistance, which leads to unavailability of power supply.This dissertation is aimed at these three problems by selecting a typical fault of Xinquan fault in northwestern China and carrying out experimental research. Four measuring sections were carried out to measure the resistance of the grounding resistor and the distance between the electrodes and the electrode.The experimental results show that: (1) pouring tap water and NaCl solution and bringing the electrode into close contact with the surrounding medium can well solve the drought in Xinjiang (2) ERT different device form and electrode distance from different side of the profile of the reaction profile, in practical applications should be integrated analysis of different devices and different electrodes from the detection results to get rich profile information (3) letter spring The electrical characteristics of the fault are as follows: there is a clear fault on the inversion resistivity profile, and the fault zone is anomalous with a low resistance plate body. The thickness of the low resistivity layer of the fault upper plate is small, and the low resistance of the lower plate The thickness of the layer is large. The cover in the western segment of the fault is thinned and the bedrock of the local section is exposed, and the thickness of the middle cover of the fault is relatively thick.