Study on the Applicatiom of Transient Electromagnetic Method in Goaf Exploration in Liaoyuan City,Jilin Province
The transient electromagnetic method adopts the principle of electromagnetic in-duction to effectively divide the strata and infer the distribution location,burial depth and longitudinal thickness of the coal mining affected area in a single section,which can achieve the vertical 2D exploration effect in the traditional sense.Based on a large number of basic geological data collected in the exploration area,combined with the goaf characteristics and the geophysical characteristics of the surrounding rock in the exploration area,this paper not only draws the pseudo-section of the apparent resistivity inversion of each section,but also achieves the vertical 2D exploration effect in the traditional sense.Moreover,GeoIPAS soft-ware is used to reintegrate and process the inversion data to draw the inversion plane contour map of apparent resistivity at different elevations,which can achieve the horizontal 2D explo-ration effect constructed by the software.According to the horizontal and vertical two-di-mensional(2D)exploration results,three-dimensional map is drawn,and the three-dimen-sional(3D)exploration effect is more intuitively interpreted.Finally,a comprehensive inter-pretation result map is drawn by synthesizing the profile,plane contour map and three-di-mensional map,and the plane anomaly in the affected area of coal mining is divided,and the anomaly location and distribution range are delineated.The two plane anomalies delineated are verified by drilling,and the verified results are in good agreement with the inferred and interpreted results of transient electromagnetic method,which shows that the research re-sults of this paper have practical application value to improve the detection accuracy of transi-ent electromagnetic method in coal mine goaf.
transient electromagnetic methodapparent resistivitythree-dimensional explo-rationmined-out area of coal minedrilling verification
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