摘要
针对接地导线源瞬变电磁的三维正演问题,本文讨论了基于频-时变换与背景-异常场分离计算策略的有限元正演方法.该方法以矢量有限元理论为基础,利用规则六面体网格对模型进行离散,并采用MUMPS求解器求取各频点的数值解,最后通过余弦变换数值滤波计算得到三维时域瞬变电磁响应.在此基础上,利用一维层状模型与公开的三维模型验证了正演算法的可靠性,并对计算精度进行了评估.验算结果表明,本文所讨论的长导线源三维瞬变电磁正演计算准确,能够满足三维反演研究对于计算精度的要求.
To address the three-dimensional(3D)forward modeling problem of transient electromagnetic fields for grounded-wire source,this paper explores a finite element forward modeling method that employs a frequency-time transformation and background-scattered field separation strategy.It utilizes the vector finite element theory,and the 3D model is discretized using structured hexahedral mesh.Subsequently,the frequency-domain numerical response is computed using the MUMPS solver.Ultimately,the time-domain transient electromagnetic response is derived via cosine transformation.On this basis,the reliability of the forward algorithm is validated using both a one-dimensional layered model and an open three-dimensional model,and its computational accuracy is assessed.Theoretical examples show that the calculation results of the 3D transient electromagnetic forward modeling proposed in this paper are accurate and can meet the calculation requirements of 3D inversion research.
作者
周军
阮帅
何可
简楚
ZHOU Jun;RUAN Shuai;HE Ke;JIAN Chu(School of Resources and Environment,University of Electronic Science and Technology of China,Chengdu 611731,China;Chinese Academy of Geological Sciences,Beijing 100037,China;Education Information Technology Center,China West Normal University,Nanchong 637009,China;The 4th Geological Brigade of Sichuan,Chengdu 611130,China)
出处
《地球物理学进展》
北大核心
2026年第1期174-181,共8页
Progress in Geophysics
基金
国家自然科学基金项目(42174092)
中央高校基本科研业务费专项资金(ZYGX2021J022)联合资助。
关键词
接地导线源
瞬变电磁
三维正演
矢量有限元法
Grounded-wire source
Transient electromagnetic
Three-dimensional forward modeling
Vector finite element method
