澳大利亚132kV高压线对EH-4工作的干扰分析及降噪处理

Analysis and Noise Reduction for 132 kV High-voltage Interference of EH-4 Work in Australian

随着海外勘探市场的扩展,在澳大利亚开展EH-4工作中遇到了132 kV高压输电线的强干扰问题,导致勘探结果与实际地质情况产生误差。对132 kV高压线的干扰特征进行了论述,得出引起干扰的主要原因为电力50Hz及其谐波所产生的电磁干扰,距离高压输电线较近时将出现磁道信号缺失。根据受干扰频段振幅较大的特点,对电磁干扰进行识别并采取屏蔽频点的方法对数据进行降噪处理。通过降噪前后的对比分析,经过降噪处理使得干扰频段振幅平稳,计算得到的视电阻率数值明显提升且接近本区的客观情况,从而增强了深部勘探成果的可信度。

With the expansion of overseas exploration market,when working with EH-4 in Australian,strong interference problems of 132 kV high-voltage line appeared,which leading to the error of exploration results of the actual geological conditions.The interference characteristics of 132 kV high-voltage line were discussed,the main reason causing the interference of electromagnetic interference generated by 50 Hz and its harmonic power,which would cause signal loss when close to high-voltage lines。According to characteristics with strong amplitude of interference frequency,electromagnetic interference would be identified then shielding method was used for suppressing the noise.Through the contrastive analysis before and after noise reduction,interference frequency amplitude was stability and the apparent resistivity value could be increased by calculation and close to the area conditions,thereby enhancing the reliability of the result of deep exploration.