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| Research on geoelectric characteristics of Holocene ancient channels in Xuzhou area |
| JIANG Guo-Qing, HUANG Jing-Jun, ZHANG Da-Lian, XU Shi-Yin, LU Jin-Tian |
| Geological Survey of Jiangsu Province, Nanjing 210018, China |
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Abstract Investigation of ancient channels is of great significance for earthquake disaster reduction, urban planning and reasonable development of ground water resources. Based on the significant electrical property difference of rock and soil in Xuzhou area, Holocene ancient channel was detected using high density resistivity method. Firstly, through numerical simulation of geoelectrical models and field test nearby boreholes, the effectiveness of high density resistivity method in detecting Holocene ancient channel and the device choice were discussed; Secondly, the result maps of section, plane and 3D were analyzed; Finally, the detecting result of high density resistivity method was verified by boreholes. Result of theoretical research and applied case indicates that Holocene ancient channels in Xuzhou area show representative electrical field response characteristics, information such as morphology and stratum structure of ancient channels can be obtained through the analysis of response characteristic; the dipole-dipole device of high density resistivity method is very sensitive to the structure variation of overburden, maximum anomalous intension, and it has certain advantages in the aspect of stratum division, so dipole-dipole device is the preferred device for the investigation of ancient channels; through arranging multiple survey lines in investigated area and with the help of 3D visual software platform, 3D spatial interpretation of target can be realized, and interpreted results will intuitively reveal the 3D morphology and spatial distribution characteristics of Holocene ancient channels.
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Received: 02 June 2017
Published: 03 April 2018
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