SOTEM法分量探测能力对比及应用实例

doi:10.11720/wtyht.2025.0183

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Abstract

This study aims to demonstrate the effects of the electric-source short-offset transient electromagnetic method(SOTEM) for water hazard prevention and control in coal mines under complex topographical conditions.To this end,the detection capabilities of the H_x and E_x components were simulated and analyzed using the SOTEM method,along with field tests in a coal mine in northern Guizhou.During the tests,four profiles were arranged and the SOTEMSoft software was used for inversion, with the inversion results verified by drilling.The results show that during measurement along the equatorial direction,the H_z component exhibited a high capability to detect low-resistivity anomalies.In contrast,the E_x component exhibited a comparable capability in detecting both low-resistivity(along the equatorial direction) and high-resistivity anomalies(along the axial direction).The SOTEM technique can accurately locate the most severe water hazard areas in coal mines under complex topographical conditions.The feasibility and accuracy of the SOTEM method for water hazard prevention and control were validated through the application in coal mines in northern Guizhou.

Key words： short-offset transient electromagnetic method(SOTEM) short-offset electric source water hazards in coal mine

Received: 03 June 2025 Published: 23 October 2025

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	Articles by authors
	Yuan PAN
	Cong LUO
	Lin XU
	Pin-Xiong CHEN
	Hong-Yi FU

Cite this article:

Yuan PAN,Cong LUO,Lin XU, et al. Comparison of component detection capabilities using the short-offset transient electromagnetic method and an application example[J]. Geophysical and Geochemical Exploration, 2025, 49(5): 1164-1172.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2025.0183 OR https://www.wutanyuhuatan.com/EN/Y2025/V49/I5/1164

Schematic of SOTEM equatorial device

Schematic of SOTEM axial device

Schematic of forward simulation

Plane distribution of vertical magnetic field at different times

Plane distribution of horizontal electric field at different times

Schematic diagram of various geoelectric models

Comparison of inversion results of equatorial measurements in a uniform half space

Comparison of equatorial measurement inversion results for H-shaped strata

Comparison of inversion results of K-type formation axial measurement

系	统	组	段	厚度/m	岩性描述	电阻率/Ω·m
第四系				0~34.30	黏土、砂土、泥砾、砂砾等	50~600
三叠系	下统	夜郎组	T₁y³	>200	粉砂岩为主	100~300
			T₁y²	$201.92 ~ 285.10 256.09$	粉砂质泥岩、灰岩、薄层石灰岩	500~1200
			T₁y¹	$5.94 ~ 17.94 11.56$	粉砂岩、泥岩、粉砂质泥岩夹泥灰岩	100~300
二叠系	乐平统	长兴组	P₃c	$19.30 ~ 26.72 20.99$	石灰岩为主	300~1200
	乐平统	龙潭组	P₃l	$129.32 ~ 161.37 138.46$	粉砂岩、泥岩、细砂岩、灰岩、炭质泥岩及煤层	30~150
	阳新统	茅口组	P₂m	>100	石灰岩	800~7000

Summary of strata in the mining area

Engineering layout diagram

SOTEM equatorial test line resistivity cross-section

SOTEM axial test line resistivity cross-section

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