强干扰矿区中广域电磁法与CSAMT探测效果对比

摘要

Because of the severe electromagnetic interference and the human interference in a copper mine in Anhui Province, the tra⁃ditional electromagnetic method is unable to obtain valid data. CSAMT method has stronger anti⁃interference capability, but the mean square relative error of CSAMT checkpoints data reaches 53.6% and the exploration effect is poorer. In this paper, wide field electro⁃magnetic method was applied to the mining area and led to the obtaining of the high quality data, with the average relative mean square error being 5.6%. Compared with the inversion result of CSAMT method, wide⁃area electromagnetic inversion result is in accordance with the geological data, the depth error is less than 10%, and the position of the orebody is consistent with the drilling information. The test results show that wide field electromagnetic method has stronger anti⁃interference capability and can be used in strong interfer⁃ence field detection.%安徽某铜矿区由于电磁、人文干扰严重，传统的电磁法无法取得有效的数据，抗干扰能力较强的CSAMT法在该区检查点数据均方相对误差达到了53．6％，勘探效果较差。将广域电磁法应用到该矿区，取得了质量较高的数据，平均相对均方误差为5．6％。与相同剖面上的CSAMT法反演结果相比，广域电磁法的反演结果与地质资料吻合，深度误差小于10％，矿体的位置与钻孔信息相符。试验结果表明，广域电磁法具有较强的抗干扰能力，可用于强干扰矿区探测。