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通过研究井轴附近矿体瞬态场的响应特征,为井中瞬变电磁场的勘探提供可靠的依据.应用时域有限差分法和Mur吸收边界,对磁偶源产生的瞬变电磁场进行三维数值模拟,建立了全空间内不同埋深、不同大小、不同倾角的低阻矿体和高阻矿体的地电模型.在数据处理过程中,排除导电全空间对二次场的影响,得到反映目标体异常情况的异常二次场.通过分析不同导电模型瞬变场的特征规律,结果表明:不同埋深、大小、倾角和电导率的矿体具有不同的响应特征,且差异较大.该方法对识别井中板状矿体有较为明显的作用.
By investigating the response characteristics of the transient field near the shaft, it provides a reliable basis for the exploration of the transient electromagnetic field in the well.Three-dimensional numerical simulation of the transient electromagnetic field generated by the magnetic dipole source is performed by using the finite difference time domain method and the Mur absorption boundary , A geoelectric model of low-resistivity ore body and high-resistance ore body with different depths, different sizes and different angles of inclination in full space is established.During the data processing, the influence of the full conductive space on the secondary field is excluded and the target The results show that ore bodies with different depths, sizes, dip angles and conductivities have different response characteristics, and the differences are quite large. This method is based on the analysis of the characteristics of the transient field in different conductive models. Plate wells on the identification of wells have a more obvious role.