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Fixed-loop TEM Data Processing Algorithm Research Based on SVD

Author: WanLing
Tutor: LinJun
School: Jilin University
Course: Measuring Technology and Instruments
Keywords: Transient Electromagnetic Singular Value Decomposition Set back line source Apparent resistivity
CLC: P631.325
Type: Master's thesis
Year: 2010
Downloads: 115
Quote: 0
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Abstract


Transient electromagnetic method , also known as time domain electromagnetic method is based on differences in electrical properties , looking for low resistivity target body to study shallow to deep geoelectric structure of a detection method , is widely used in the search for mineral resources and hydrological exploration in . Central loop transient electromagnetic method used device , overlapping loops , dating back to the line of source and dipole device . Which , given back to the line of the source device simply laying the actual measurement transmitter coil probe to complete the entire survey area , to solve the problem of field work in laying coil trouble , and improve work efficiency , thus concern . In this paper, for the set back line source transient electromagnetic data inversion algorithm research to obtain the research results of the following aspects : First, calculate the transient electromagnetic response given loop source circle back to the line with a square back line equivalent approach increased forward speed ; Second, the calculated the given loop source late apparent resistivity fitting equation . The response the fitting voltage conversion for the apparent resistivity fitting avoid the inversion of the response voltage dynamic range calculation Jacobian matrix instability , at the same time , can be observed apparent resistivity variation with depth , estimated underground geologic body physical parameters as the initial model parameters ; inversion again generalized inverse matrix theory and singular value decomposition method in when processing transient electromagnetic data by the comparative method of least squares and the singular value decomposition advantages and disadvantages of transient electromagnetic data inversion interpretation plus damping truncated singular value decomposition method ; Finally, using the above method of transient electromagnetic data inversion Inner Mongolia Erlianhot regional field calculation , the inversion results explain the apparent resistivity consistent results , verify the correctness and usefulness of the data processing method proposed in this paper .

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CLC: > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Geophysical exploration > Electrical prospecting > Method > Electromagnetic Method
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