Transient electromagnetic transmitting coil self-induction signal eliminating method and device

A transmitting coil and transient electromagnetic technology, which is applied in the field of self-inductance signal elimination, can solve problems such as transient electromagnetic data distortion, and achieve the effect of reducing the degree of distortion and improving the accuracy of exploration.

Inactive Publication Date: 2016-06-01
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] In order to solve the problem in the prior art that the electromagnetic induction signal and the coil self-inductance signal are superimposed together to distort the transient electromagnetic data, the present invention provides a method and device for eliminating the self-inductance signal of the transient electromagnetic transmitting coil, Using geophysical methods to reduce the degree of early distortion and improve exploration accuracy

Method used

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  • Transient electromagnetic transmitting coil self-induction signal eliminating method and device
  • Transient electromagnetic transmitting coil self-induction signal eliminating method and device
  • Transient electromagnetic transmitting coil self-induction signal eliminating method and device

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Embodiment 1

[0066] Transient electromagnetic measurement was carried out in an area to be evaluated in Shanxi. First place the ungrounded return line on the ground. A large fixed source return line device (600m x 600m) is used in the work, and a step current is sent on the ungrounded return line. The ungrounded return line generates an excited electromagnetic field, and the underground medium is induced The eddy current is generated; the receiving probe is placed in the center of the loop to detect the geoelectric structure at a depth of 50-200m underground, measure the induced secondary field generated by the underground medium, and obtain the secondary induced voltage curve.

[0067] image 3 It is a double-logarithmic coordinate diagram of the secondary induced voltage of the center point measured in the field. The abscissa is time, and the ordinate is the induced voltage. This curve signal includes two parts, one part of the signal is a useful signal, and the other part is an interfer...

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Abstract

The invention provides a transient electromagnetic transmitting coil self-induction signal eliminating method and device. The method includes the following steps that: a rectangular loop source is adopted to detect secondary induction transient electromagnetic field data of an area to be estimated with predetermined observation parameters; transmitting coil self-induction signal transient electromagnetic field data are obtained based on the predetermined observation parameters; and the difference value of the secondary induction transient electromagnetic field data and the transmitting coil self-induction signal transient electromagnetic field data is calculated, and the interference of transmitting coil self-induction signals are eliminated according to the difference value, so that the electromagnetic induction signals of the area to be estimated can be obtained. With the method and device adopted, the degree of distortion at an early stage is reduced, and exploration accuracy is improved.

Description

technical field [0001] The invention relates to the fields of coalfield hydrogeology and geophysics, in particular to a method and device for eliminating self-inductance signals of transient electromagnetic transmitting coils. Background technique [0002] The transient electromagnetic (TEM) method is a common geophysical method based on electromagnetic induction, which uses step waves or other pulse current field sources to excite the earth to generate a transition process field, and forms a vortex alternating electromagnetic field in the earth at the moment of power failure. Measure the attenuation characteristics of the secondary induced electromagnetic field produced by the underground medium over time, so as to achieve the purpose of solving geological problems. Since the step pulses emitted by transient electromagnetic waves are actually composed of various high-frequency and low-frequency harmonics, one emission can complete information detection at different depths a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/10
CPCG01V3/10
Inventor 薛国强侯东洋底青云钟华森冯西会
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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