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| THE INFLUENCE OF DEMAGNETIZATION ON MAGNETIC DATA INTERPRETATION |
| LIU Shuang1, LIU Tian-you1, GAO Wen-li2, FENG Jie2, QIU Li-quan2 |
1. Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China;
2. Institute of Geophysical & Geochemical Exploration, CAGS, Langfang 065000, China |
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Abstract Because demagnetization reduces magnetic anomaly amplitude and distorts the shape, it affects the accuracy of geological results inversed and interpreted by magnetic data. Exemplified by a horizontal and theoretical 2D cylinder model, this paper simulated the magnetic field in consideration of demagnetization and by using the finite element method and studying the influence of demagnetization on magnetic anomaly. When the magnetic susceptibility k is greater than 1.0 SI, the anomaly maximum deviation reaches up to 1 300 nT and the relative deviation is more than 30%, whether demagnetization is considered or not. It is thus concluded that the remarkable influence of demagnetization must not be ignored. Besides, the magnetic data inversion conducted in the Galinge iron mine of Qinghai shows that ignoring the demagnetization will underestimate the size of the inversed ore body and mislead the drilling design and resource reserves estimation.
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Received: 07 July 2011
Published: 10 August 2012
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