基于镜像模型的矿井瞬变电磁全空间反演研究

Whole-space Inversion of Mine Transient Electromagnetic Method based on Mirror model

常规的瞬变电磁反演用半空间响应乘以全空间响应系数来拟合观测数据,具有一定的局限性;直接进行全空间反演,瞬变电磁场的空间不可分性会导致反演结果的不稳定。针对以上问题,提出了基于镜像模型的矿井瞬变电磁全空间反演方法,编制了反演程序。对低阻模型、受巷道后方高阻影响的低阻模型、受巷道后方低阻影响的低阻模型进行了反演试算,结果表明:基于镜像模型的全空间反演方法能够准确反演出掘进工作面前方的低阻地质异常体,巷道后方的高阻体不会影响对前方低阻地质异常体的判断。

The conventional inversion method based on half -space response multiplied by whole spatial re-sponse factor has some limitations.The direct whole space inversion will lead to instability of the inversion re-sults.To solve the above problem , the paper presents mine transient electromagnetic whole -space inversion method based on mirror model.The inversion of low resistivity model , low resistivity model affected by high resistance and low resistivity model affected by low resistance show that：the method of mine transient electro-magnetic Whole-space inversion based on mirror model can inverse the geological low resistivity anomalies in the front of heading face accurately , and the high resistivity of rear of the roadway will not affect the judgment for geological low resistivity anomalies in the front of the roadway.