Identification of double-layered water-filled zones using TEM; a case study in China

At present in China, the use of the transient electromagnetic method (TEM) is emerging as a leading geophysical technique for exploration of water-filled zones in coal mines. These zones are more conductive than the host coal and are easy targets to map. However, there is a growing interest for the...

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Bibliographic Details
Published inJournal of environmental & engineering geophysics Vol. 23; no. 3; pp. 297 - 304
Main Authors Xue Guoqiang, Xue Guoqiang, Hou Dongyang, Hou Dongyang, Qiu Weizhong, Qiu Weizhong
Format Journal Article
LanguageEnglish
Published Environmental and Engineering Geophysical Society 01.09.2018
Subjects
applied (geophysical surveys & methods)
Asia
case studies
China
coal
coal seams
Datong China
detection
drilling
Engineering geology
Environmental geology
Far East
geologic hazards
geophysical methods
Geophysics
hydrodynamics
mines
monitoring
natural hazards
numerical models
risk assessment
sedimentary rocks
sensitivity analysis
Shanxi China
simulation
site exploration
transient methods
water-filled zones
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Summary:At present in China, the use of the transient electromagnetic method (TEM) is emerging as a leading geophysical technique for exploration of water-filled zones in coal mines. These zones are more conductive than the host coal and are easy targets to map. However, there is a growing interest for the investigations of double-layered or multi-layered mined-out zones. Therefore, it is necessary to study the feasibility of TEM's abilities to detect double-layered, water-filled voids. In this study, the basic hydrogeological conditions of a survey area, located in the northern China, are described. The corresponding geophysical models of the single- and double-layered water-filled zones are developed from borehole logging data. Then, forward calculations of different models are carried out with 1D numerical simulations. The modeling results show that it is feasible for TEM to identify these types of targets under certain conditions, including instrument sensitivity, low resistivity for the water-filled zones, and shallower depths. Moreover, the field survey for locating double-layered water-filled zones in coal mines in the Datong region of Shanxi Province is verified by well drilling.
ISSN:1083-1363
1943-2658
DOI:10.2113/JEEG23.3.297