Resumo

HUANG, Lanying; LIU, Shengdong; WANG, Bo  e  ZHOU, Fubao. Quantitative Calculation of Aquifer Water Quantity Using TEM Data. Earth Sci. Res. J. [online]. 2017, vol.21, n.1, pp.51-56. ISSN 1794-6190.  https://doi.org/10.15446/esrj.v21n1.63002.

Mine water is a menace to coal mining. Mine water quantity is detected by drilling in the coal mine roadway, and the disadvantage is the high workload and low efficiency. Therefore, transient electromagnetic method (TEM) was proposed, and TEM data was processed to detect the water yield property of a targeted layer in the coal mine. Through a mine-oriented 3D Transient Electromagnetic Method observing system, the signal of induced voltage is obtainable. Transient Electromagnetic Method 3D data volume can be calculated through the calculation of all-time resistivity and time-depth conversion. After an appropriate apparent resistivity value is set, the spatial distribution range of an aquifer can be determined. Then, with the water-filling coefficient of the aquifer, its water quantity can be estimated. The water yield property detection results in the No.4 coal seam goaf of the No.80101 workface in Jude Mine of Shanxi, China, demonstrates that the apparent resistivity of this goaf is less than 3 Ω.m, and the projection area of low resistivity anomaly zone is 22,383 m2. By using the formula Q=KMS, we can estimate that the water volume is 33,574 m3. Three boreholes have been constructed for the next dredging and drainage project, which results in a total water yield of 33,089 m3. The error percentage of the predicted water quantity is less than 1.5%. It can thus be concluded that it is feasible to predict aquifer water content with TEM data.

Palavras-chave : Transient electromagnetic method; Apparent resistivity calculation; Time-depth conversion; Water quantity.

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