张量CSAMT有效观测区域模拟对比分析

根据标量CSAMT、垂直双偶极源CSAMT、三偶极源CSAMT等多分量响应式设计程序,通过数值模拟给出其十字型场源的X方向和Y方向电偶极子电磁场各分量的场值分布图,发现十字型观测区域中存在着分布零散且较广的弱区,有效观测区域较小,且对地形条件要求苛刻,不利于在山区等地形起伏复杂地区施工.在旋转三偶极装置的原理基础上提出了多偶极子源矢量合成测量方式,相比较十字型场源的施工方式而言,通过矢量合成多组的电偶极子,有利于实现全区无弱区观测,同时场源铺设简便对各种地形有着较强的适用性.研究结果为张量可控源进一步的测量工作提供技术依据.

Comparison and analysis on effective observation area of tensor CSAMT by numerical simulation method

According to the response formulas of scalar CSAMT, the vertical dipole source CSAMT and the three dipole source CSAMT, we design the program which is used to do numerical simulation. And the modeling results show that the distribution of "+" type source responses exhibit that effective observation zone is smaller. The reason is that the distribution of weak value zones is scattered and wide. Besides, its requirements of the working site are very harsh. Hence, it is impossible to work in the mountainous area. Based on the principle of the rotating three dipole device, we propose the new device composited by multiple dipole sources. Compared with the "+" type source, it realizes that the whole observing area without weak value zones. Moreover, the new device is easy to carry out in various terrains. The results provide a technical basis for further engineering production of tensor measurement.