3D forward modeling and response characteristics of low-resistivity overburden of the CFS-PML absorbing boundary for ground-well transient electromagnetic method

扫码查看

原文链接

NETL
NSTL
万方数据
维普

外文摘要：This study used the stable and convergent Dufort-Frankel method to differentially discretize the diffusion equation of the ground-well transient electromagnetic secondary field.The absorption boundary condi-tion of complex frequency-shifted perfectly matched layer(CFS-PML)was used for truncation so that the low-frequency electromagnetic wave can be better absorbed at the model boundary.A typical three-dimensional(3D)homogeneous half-space model was established and a low-resistivity cube model was analyzed under the half-space condition.The response patterns and drivers of the low-resistivity cube model were discussed under the influence of a low-resistivity overburden.The absorption boundary conditions of CFS-PML significantly affected the low-frequency electromagnetic waves.For a low-resistivity cube around the borehole,its response curve exhibited a single-peak,and the extreme point of the curve corresponded to the center of the low-resistivity body.When the low-resistivity cube was directly below the borehole,the response curve showed three extreme values(two high and one low),with the low corresponding to the center of the low-resistivity body.The total field response of the low-resistivity overburden was stronger than that of the uniform half-space model due to the low-resistivity shielding effect of electromagnetic waves.When the receiving-transmitting distance gradually increased,the effect of the low-resistivity overburden was gradually weakened,and the response of the low-resistivity cube was strengthened.It was affected by the ratio of the overburden resistivity to the resistivity of the low-resistivity body.

外文关键词：

Ground-well transient electromagnetic methodCFS-PML boundary condition3D forward modelingLow-resistivity overburden

作者：

Lijuan Zhao、Mingzhong Gao、Nengzhong Lei、Hongfei Duan、Weizhong Qiu、Zhaoying Chen

展开 >

作者单位：

State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,China

School of Civil Engineering and Architecture,Wuyi University,Wuyi 354300,China

Jinneng Holding Group,Taiyuan 030000,China

China University of Mining and Technology,Xuzhou 221116,China

Shanxi Coal Geology 115 Exploration Institute Co.,Ltd.,Shanxi Geological Group Co.,Ltd.,Datong 037003,China

State Key Laboratory of Coal and Coalbed Methane Co-mining,Jincheng 048012,China

展开 >

基金：

China Postdoctoral Science FoundationScience and Technology Innovation Project of Higher Education in Shanxi ProvinceCentral Guiding Local Science and Technology Development Fund ProjectShanxi Province Basic Research Plan General Project

项目编号：

2022M7233912019L0754YDZJSX2021B021202203021221294

出版年：

2023

DOI：

10.1016/j.ijmst.2023.10.005

矿业科学技术学报(英文版)

中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCDEI

影响因子：1.222

ISSN：2095-2686

年,卷(期)：2023.33(12)

参考文献量12