摘要
随着目标体埋藏深度的增加,地下地质环境和构造均愈加复杂,探测难度也急剧增大,因此引入多通道瞬变电磁法对三维模型进行研究,从而为实际资源勘探奠定良好的基础。针对多通道瞬变电磁法的勘探特点,首先介绍了多通道瞬变电磁的工作原理及突出特点,其次对其正反演理论进行研究及分析。研究表明:瞬变电磁场的频率域响应可通过时-频转换的方法得到时间域响应,再利用共轭梯度法来进行反演;最后以一个高阻与低阻组合的三维模型进行反演模拟,并绘制等时曲线。分析反演结果可以看出多通道瞬变电磁法对三维模型的响应及边界刻画都较好,能够真实的反应出异常体的形态,证明了多通道瞬变电磁法在能够成为反映异常体的有效手段。
As the burial depth of the target body increases,the underground geological environment and structure are becoming more complex,and the difficulty of detection increases sharply.Therefore,the multi-channel transient electromagnetic method is introduced to study the three-dimensional model,thereby laying a good foundation for actual resource exploration.Aiming at the exploration characteristics of the multi-channel transient electromagnetic method,firstly,the working principle and outstanding characteristics of the multi-channel transient electromagnetic method are introduced,and the second is the research and analysis of its forward and inverse theory.Research shows that the frequency domain response of the transient electromagnetic field can be obtained through the time-frequency conversion method,and then the time domain response can be inverted by the conjugate gradient method.Finally,a three-dimensional model combining high resistance and low resistance is used for inversion simulation,and draw isochronous curves.Analyzing the inversion results,it can be seen that the multi-channel transient electromagnetic method has good response to the three-dimensional model and the boundary description.It can truly reflect the shape of the anomaly,which proves that the multi-channel transient electromagnetic method can be a reflection of the anomaly effective means.
作者
常永邦
艾正敏
CHANG Yongbang;AI Zhengmin(East China University of Technology,Nanchang 330013,China)
出处
《能源研究与管理》
2021年第1期68-73,共6页
Energy Research and Management
基金
东华理工大学研究生创新基金(DHYC-202013)。
关键词
多通道瞬变电磁
正反演
三维模型
等时曲线
multi-channel transient electromagnetic
Forward and inversion
three-dimensional model
isochronous curve
