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| The application of SOTEM method to populated areas: A case study of Fangzi coal mine goaf |
CHEN Da-Lei1,2( ), CHEN Wei-Ying3, GUO Peng1,2, WANG Run-Sheng1,2, WANG Hong-Jun1,2, ZHANG Chao1,2, MA Qi-He4, HE Chun-Yan1,2 |
1.Shandong Geophysical and Geochemical Exploration Institute, Jinan 250013, China
2.Shandong Geological Exploration Engineering Technology Research Center,Jinan 250013,China
3.Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
4.Shandong Zhengyuan Geological Exploration Institute, China Metallurgical Geology Bureau, Weifang 261057, China |
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Abstract Transient electromagnetic method (TEM) is the main tool for detecting mined-out area. However, when the goaf is buried deep or there are many buildings in the survey area, it is often difficult for the traditional loop source device to meet the detection needs. SOTEM has such advantages as high signal amplitude, strong signal-to-noise ratio, large detection depth, and convenient and efficient construction. The buried depth of the goaf in the Fangzi coal mine in Weifang City is about 500 meters, and most of the area is in villages where houses are densely distributed. In order to effectively detect the distribution and influence range of the goaf under Jiangjia Village, the authors adopted SOTEM method to carry out the detection work. The problem of building obstacle was overcome by placing transmitting source outside the village and using portable receiving device to receive signal in the village. Wavelet denoising and five-point smoothing technology were used to filter the strong interference data, and then OCCAM method was used to carry out one-dimensional inversion of the data. The results show that the depth of SOTEM detection reached 800 meters, and the distribution range of low-resistance goaf was successfully delineated, which was later verified by drilling.
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Received: 13 December 2019
Published: 26 October 2020
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The diagram of SOTEM device
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| 地层 | 岩性 | 厚度 | | 第四系(Q) | 褐色、棕黄色,粉沙土及沙质黏土,底部夹有钙结石及凝灰岩和片麻岩的砾石 | 0~19.5 m,平均7.92 m | 下白垩统青山组
(K1q) | 上部:凝灰质砂岩,灰绿色凝灰岩,块状构造;片麻岩、石灰岩、石英岩、馒头页岩
下部:红色砂砾岩互层 | 20~931 m,平均550.00 m
8~203.8 m,平均61.66 m | 下侏罗统坊子组
(J1f) | 本区唯一含煤地层,岩性为粗砂岩、中砂岩、细砂岩、粉砂岩,细砂岩粉砂岩互层,
煤层及岩浆岩,纯属陆相沉积,含上、中、下三层主要可采煤层 | 0~270.91 m,平均159 m | 太古宇泰山群
(Ar3t) | 花岗片麻岩为主,次为绿泥石片岩及黑云母花岗片麻岩 | 不详 |
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Stratigraphic distribution of survey area
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Layout of measurement sites and transmitting source in Jiangjia
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| 发射源编号 | 长度/m | 控制测线 | 收发距/m | | Tx1 | 644 | JH1、JH2、JH3 | 420~646 | | Tx2 | 651 | JH4、JH5、JH6、JH7 | 312~660 | | Tx3 | 428 | JS1、JS2、JS3、JS4 | 250~595 | | Tx4 | 765 | JS5、JS6、JS7、JS8 | 637~985 |
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The length and covered lines of each source
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Decay curves of measured induced voltage
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The signal before and after de-noising
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The 1D OCCAM inversion results of site JH7-180 and JS5-500
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The inversion resistivity section of line JS5
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Planar distribution of resistivity contours at different depths
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