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介绍了磁源瞬变电磁法(TEM)拟大地电磁法(MT)二维反演技术,总结出一套基于拟MT二维反演技术的磁源TEM实测资料处理流程,并对其关键流程进行了较为详细的介绍.对陕西某矿区磁源TEM实测资料进行拟MT二维反演,结果表明:反演结果对异常刻画的更加细致,反映出了近地表的低阻异常,深部的低阻异常范围也更加集中,优于视电阻率拟断面图结果;根据15、17和19线TE和TM联合反演的结果,推断了两条断裂F和F_1~2,F_1~2断裂与已知地层岩性分界面处的断裂相吻合,据此划分了勘探区的地层分布;结合矿区岩矿石电性特征、成矿构造特征和化探异常范围,推断反演结果中的低阻异常可能与成矿相关,为下一步地质下钻提供了物探依据.文章利用拟MT二维反演方法实现了磁源TEM实测数据二维反演解释,并取得了较好的地质效果,得出磁源TEM拟MT二维反演技术可在实际资料处理中予以推广使用的结论.
This paper introduces two-dimensional MT (Magnetotelluric (MT) two-dimensional inversion technology of magnetic source transient electromagnetic method (TEM), summarizes a set of MT data processing flow based on MT two-dimensional inversion technology and analyzes the key processes A detailed description is given in this paper.A two-dimensional inversion of simulated MT data from a magnetic source TEM in a mining area in Shaanxi Province shows that the inversion result is more detailed for the anomalous characterization, which reflects the low resistivity anomaly near the surface and the low The range of resistivity anomalies is also more concentrated, which is better than the apparent resistivity pseudosection diagram. Based on the results of joint inversion of TE and TM at lines 15, 17 and 19, it is inferred that the fractures of F and F_1 ~ 2 and F_1 ~ According to this, the stratigraphic distribution in the exploration area is divided. Based on the electrical characteristics of rock ore, the characteristics of metallogenic structure and the scope of geochemical anomaly, it is possible to infer the low resistivity anomalies in the inversion results Which is related to the mineralization and provides the geophysical basis for further geological drilling.Based on the two-dimensional inversion of the measured data of the magnetic source TEM by the quasi-MT two-dimensional inversion method, the geological effect has been obtained and the magnetic The source TEM quasi-MT two-dimensional inversion technique can be used in actual data processing Conclusion widely used.