Results 21 to 30 of about 291 (154)

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

International Journal of Mining Science and Technology, 2023
This study used the stable and convergent Dufort-Frankel method to differentially discretize the diffusion equation of the ground-well transient electromagnetic secondary field.
Lijuan Zhao, Mingzhong Gao, Nengzhong Lei, Hongfei Duan, Weizhong Qiu, Zhaoying Chen   +5 more
doaj   +1 more source

Three-Dimensional Dual-Mesh Inversions for Sparse Surface-to-Borehole TEM Data

Remote Sensing, 2023
The surface-to-borehole transient electromagnetic (SBTEM) method can provide images at higher resolution for deep earth because its receivers are close to targets.
Luyuan Wang, Yunhe Liu, Changchun Yin, Yang Su, Xiuyan Ren, Bo Zhang   +5 more
doaj   +1 more source

EMD-Based Borehole TEM Array Signal Denoising and Baseline Wander Correction for NDT of Downhole Casings

IEEE Access, 2020
Transient electromagnetic (TEM) techniques have been proven to be efficient for nondestructive testing (NDT) operations due to their pulsed eddy-current properties.
Bo Dang, Changzan Liu, Ling Yang, Gang Wang, Mimi Wang, Zhiping Ren, Ruirong Dang   +6 more
doaj   +1 more source

Research on the development height of water-conducting fracture zone in overburden rock based on transient electromagnetic method in hole

Meikuang Anquan
Transient electromagnetic method has shown great effectiveness in detecting water channels. However, conventional methods for detecting the development of water-conducting fracture zones are not suitable due to environmental influences.
Qinghua LIANG, Xiangjun DING, Guangliang LIU, Zhicheng LIU, Chunyuan WANG, Huan ZHANG   +5 more
doaj   +1 more source

Three-component detection technology of down-hole TEM for hidden geological anomalies in coal mines

Meitan kexue jishu
To meet the geological requirements for detailed exploration of concealed anomalies in coal mines and to accurately delineate and interpret hidden water hazards around boreholes, a three-component geological anomaly localization technique using borehole ...
Xiaowei GAO
doaj   +1 more source

Application of Comprehensive Geophysical Prospecting Method in the Exploration of Coal Mined-Out Areas

Advances in Civil Engineering, 2019
Due to the influence of mining technology, some coal mines will leave mined-out areas (or goafs) in the rock mass after mining. If the distribution law and influence scope of mined-out areas cannot be accurately explored and controlled, it will bring ...
Xiao Luo, Shuang Gong, Zhonggang Huo, Hongyan Li, Xinpin Ding   +4 more
doaj   +1 more source

Status and prospect of coal mine geophysical exploration technology in China

Gong-kuang zidonghua, 2017
On the basis of coal mine geophysical exploration technology development represented by channel wave seismic method, mine transient electromagnetic method and underground borehole inclinometry, development directions of mine geophysical exploration ...
ZHANG Peng
doaj   +1 more source

Eccentric array-based borehole transient electromagnetic system for NDT of multipipe strings in sidetrack well

Journal of Physics: Conference Series, 2021
Abstract In the middle and late stage of oilfield development, the sidetracking technology is widely used for restoring the production of stripper well, damaged well and abandoned well. In this paper, we present an eccentric array-based borehole transient electromagnetic (TEM) system for nondestructive testing (NDT) of multipipe strings ...
Yang Ling, Dang Ruirong, Dang Bo, Guo Rui   +3 more
openaire   +1 more source

Spatial Variability of Permafrost and Active Layer Thickness in a Forested Hillslope of the Taiga Shield

Permafrost and Periglacial Processes, Volume 37, Issue 3, Page 306-322, July/September 2026.
ABSTRACT Under continued climate warming, understanding present‐day permafrost distribution and the controls on ground thaw are critical for predicting permafrost thaw trajectories and associated implications. This study presents a high‐resolution investigation of permafrost extent and active layer thickness (ALT) across a coniferous forested hillslope
Alana Muenchrath, Christopher Spence, Andrew Ireson   +2 more
wiley   +1 more source

“Cold Tropics”: Permafrost Existence and Thickness on Eastern Nevado Coropuna (Southern Peruvian Andes) Revealed by Ground‐Penetrating Radar and Geoelectrical Soundings

Permafrost and Periglacial Processes, Volume 37, Issue 3, Page 517-534, July/September 2026.
ABSTRACT The existence of permafrost was explored at tropical latitude on Nevado Coropuna (southern Peruvian Andes) using a combination of ground‐penetrating radar (GPR) and vertical electrical sounding (VES) in order to strengthen the mutual validation of data processing and interpretation.
Velnia Chacca, Ramón Pellitero, Adriano Ribolini, José Úbeda, Luis Mariano del Río, Ricardo Vila, Oscar Vilca   +6 more
wiley   +1 more source