摘要
Due to the strong electromagnetic interferences and human interference,traditional electromagnetic methods cannot obtain high quality resistivity data of mineral deposits in Chinese mines.The wide field electromagnetic method(WFEM),in which the pseudo-random signal is taken as the transmitter source,can extract high quality resistivity data in areas with sever interference by only measuring the electric field component.We use the WFEM to extract the resistivity information of the Dongguashan mine in southeast China.Compared with the audio magnetotelluric(AMT)method,and the controlled source audio-frequency magnetotelluric(CSAMT) method,the WFEM can obtain data with higher quality and simpler operations.The inversion results indicate that the WFEM can accurately identify the location of the main ore-body,which can be used for deep mine exploration in areas with strong interference.
为了寻求生产矿山深边部找矿的有利手段,在安徽冬瓜山铜矿区进行多种电磁方法的对比研究。由于该地区受到严重的人文电磁干扰,传统的电磁法无法取得有效的数据。然而,广域电磁法(WFEM)采用伪随机信号作为发射源,只需测量一个电磁场分量便可达到勘探效果,具有抗干扰能力强、工作效率高的优点。将广域电磁法应用于冬瓜山矿区,对比分析音频大地电磁法(AMT)、可控源音频大地电磁法(CSAMT)和WFEM的原始数据。结果表明,WFEM在强干扰矿区能获得高质量的数据,其反演结果对主矿体位置的反映与已知资料结果吻合,说明WFEM是一种强干扰矿区深边部找矿的有利手段。
基金
Project(2018YFC0807802)supported by the National Key R&D Program of China
Project(41874081)supported by the National Natural Science Foundation of China
