Application cases of the short-offset transient electromagnetic method in detecting goafs with thick overburden in a coal mine
HUANG Shi-Mao1,2(), YANG Guang1,2(), WANG Jun-Cheng1,2, LUO Chuan-Gen1,2, XU Ming-Zuan1,2, ZHOU Nan-Nan3, ZHAO Peng4
1. Geological Exploration Technology Institute of Jiangsu Province, Nanjing 210049, China 2. Jiangsu Province Engineering Research Center of Airborne Detecting and Intelligent Perceptive Technology, Nanjing 210049, China 3. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China 4. Beijing Zhongkediyuan Technology Co., Ltd., Beijing 100029, China
Within a coal mine in Peixian County, Xuzhou City, brick-red Paleogene and Neogene strata were deposited in the faulted basin during the Cenozoic, with extensive Quaternary strata overlying various strata. The Quaternary, Jurassic, and Cretaceous strata exhibit thick overburden, up to over 500 m. This study explored the coal mine using the short-offset transient electromagnetic (SOTEM) method. Based on geoelectric conditions, reasonable observation parameters were designed to obtain the subterranean electric structure within a burial depth of 1500 m. Goafs were detected at a burial depth of 900 m, with their delineated boundaries aligning with the mining situation of the coal mine. The results of this study serve as a reference for detecting goafs with thick overburden in North China-type coalfields.
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