2D、3D高密度电法探测断层效果及其应用

在工程项目开展之前,查明工区断层分布情况是必不可少的一项工作。目前主要利用2D高密度电法进行探测,现增加了3D高密度电法进行对比分析。为了验证2D、3D高密度电法探测断层的有效性以及了解断层的响应特征,建立正、逆断层两种模型,利用有限元法正演以及最小二乘法反演,对比不同模型之间反演结果的差异性,最后利用野外实例做进一步的分析验证。结果表明:高密度电法探测断层具有一定的有效性和准确性,但是对逆断层的探测效果明显好于正断层; 3D高密度电法得到的数据量丰富,反演深度大,结果也更接近理论模型。野外实测资料进一步验证了模拟结果,所得到的结论对断层的探测以及解释分析具有一定的指导意义。

Study and Application of 2D and 3D High Density Electrical Method for Fault Detection

Before the project, it is necessary to find out the fault distribution in the work area. At present, 2D high-density electrical method is mainly used for detection, and 3D high-density electrical method was added to compared in this paper. In order to verify the effectiveness of 2D and 3D high-density electrical methods in detecting faults and understand the response characteristics of faults, two models of forward and reverse faults were established. Finite element method was used for forward calculation and least square method was used for inversion. Finally, field examples were used for further analysis and verification. The results show that the high density electrical method is effective and accurate in detecting faults, but it is better for detecting thrust faults than normal faults. The data obtained by the 3D high-density electrical method are abundant, the inversion depth is large, and the results are closer to the theoretical model. The simulation results are further verified by field data, and the results obtained has certain guiding significance for the electrical fault detection and analysis.