0 引言
图1 孔域可控源电磁法探测原理示意图(红色虚线箭头为发射线圈产生的一次场磁感应线,蓝色虚线箭头为硫化物矿体产生的二次场磁感应线。) Fig.1 Schematic diagram of the BCSEM detection principle (The red dashed lines with arrows represent the primary magnetic field lines generated by the transmitting coil, while the blue dashed lines with arrows represent the secondary magnetic field lines induced by the SMS.) |
1 正演模拟分析
1.1 模型构建
1.1.1 规则板状体模型
1.1.2 TAG热液丘模型
1.2 正演参数设置
表1 不同电导率和发射频率条件下的趋肤深度Tab.1 Skin depth under varying conductivity and transmitting frequency conditions |
| 电导率/(S·m-1) | 频率 | |||
|---|---|---|---|---|
| 10 Hz | 100 Hz | 1 000 Hz | 5 000 Hz | |
| 1 | 159.2 | 50.3 | 15.9 | 7.1 |
| 10 | 50.3 | 15.9 | 5.0 | 2.2 |
| 30 | 29.1 | 9.2 | 2.9 | 1.3 |
| 50 | 22.5 | 7.1 | 2.2 | 1.0 |
| 60 | 20.6 | 6.5 | 2.1 | 0.9 |
| 100 | 15.9 | 5.0 | 1.6 | 0.7 |

