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1D FORWARD OF TEM OF CENTRAL LOOP CONFIGURATION ON SEA FLOOR AND CALCULATION OF ALL-TIME APPARENT RESISTIVITY |
HU Jun-hua1, CHANG Yan-jun1, LEI Sheng-lan1, SUN Wei-bin2 |
1. Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China;
2. BGP INC. China National Petroleum Corporation, Zhuozhou 072750, China |
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Abstract 1D forward of transient electromagnetic response of central loop configuration on sea floor was conducted first, in which the Hankle transform involved with the expression for vertical magnetic component in frequency domain was numerically calculated using filter coefficients of 124 points, and frequency-time domain transform was performed by using cosine transform method which could be adaptive within a wide range of time. And then, the algorithm of all-time apparent resistivity was employed, which is based on Continued Fractions expression. Several representative models were calculated and curves of apparent resistivity versus depth were drawn. The results show that these curves can generally describe the variation of resistivity under seabed, and the depth of conductivity/resistivity layers can be estimated according to the extreme points, thus providing a fast and efficient approach for the interpretation of marine TEM data and the assessment of original models.
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Received: 28 November 2012
Published: 10 December 2013
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