CSAMT phase correction and its application in detection of water-accumulating area of goaf in coal mine

Authors

SU Chao, Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
HOU Yanwei, Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
WANG Cheng, Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China
LI Dan, Xi'an Research Institute Co. Ltd., China Coal Technology and Engineering Group Corp., Xi'an 710077, China

Abstract

Magnetic field data of controlled source audio magnetotelluric method(CSAMT) is vulnerable to electromagnetic interference, and will lead to serious degradation of phase data quality. The affected phase data are corrected by referring to the high quality phase data of adjacent measuring points and combining the least squares fitting and interpolation method. Through forward simulation analysis, it is found that cubic polynomial interpolation is effective, not only can restore the variation characteristics of phase curve more accurately, but also involve the corrected phase data in the inversion calculation, so that the inversion results are more accurate and reliable. The method is applied to the detection of water-accumulating area of goaf in a coal mine in Shanxi Province. The detection results accurately reflect the scope of the known wa-ter-accumulating area of goaf.

Keywords

controlled source audio magnetotelluric method(CSAMT), phase correction, least square fit, cubic polynomial interpolation, water-accumulating area of goaf

DOI

10.3969/j.issn.1001-1986.2019.06.027

Recommended Citation

SU Chao, HOU Yanwei, WANG Cheng, et al. (2019) "CSAMT phase correction and its application in detection of water-accumulating area of goaf in coal mine," Coal Geology & Exploration: Vol. 47: Iss. 6, Article 28.
DOI: 10.3969/j.issn.1001-1986.2019.06.027
Available at: https://cge.researchcommons.org/journal/vol47/iss6/28

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