Abstract
Carrying out the forward modeling and one-dimensional apparent resistivity optimization calculation of TEM(transient electromagnetic method), theoretically verifies the the possibility that obtains the apparent resistivity in the full time domain under the condition of multiple offsets. By calculating the second derivative, Halley’s method can accelerate the iteration and make the function converge. The moment, offset and apparent resistivity are controlled by variable method. Halley’s method is used to iterate the moment, offset and apparent resistivity for completing the optimization calculation. In this paper, a conclusion will be finally drawn that the multi-offset TEM can get the apparent resistivity in the full time domain.
Highlights
Transient electromagnetic method(TEM) is a widely used electromagnetic exploration method in time domain[1]
A small system of transient electromagnetic of magnetic disource is selected, which provides the possibility to identify the resistivity of shallow media.The multi-offset method, which does not frequently move artificial magnetic field source, can greatly improve the efficiency of field work.The optimal calculation method of apparent resistivity in one dimension full time domain eliminates the subjective factor of dividing time domain and achieves the purpose of detecting different depth at the same time
The small circular coils regarded as magnetic dipoles serve as artificial field sources and the small coils at different offsets serve as the receiving coils
Summary
Transient electromagnetic method(TEM) is a widely used electromagnetic exploration method in time domain[1]. The early time domain corresponds to shallow underground depth and is often used for shallow hydrogeological, environmental[3] and structural exploration[4].Plotnikov conducted numerical experiments using training software and found that shallow depth meant that the response curve could not adequately reflect the nonuniformity of the resistivity profile, but for shallow depth, a small transient electromagnetic system might be reasonable[5]. A small system of transient electromagnetic of magnetic disource is selected, which provides the possibility to identify the resistivity of shallow media.The multi-offset method, which does not frequently move artificial magnetic field source, can greatly improve the efficiency of field work.The optimal calculation method of apparent resistivity in one dimension full time domain eliminates the subjective factor of dividing time domain and achieves the purpose of detecting different depth at the same time
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