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Plane gradient measurement method based on transient electromagnetic method

A transient electromagnetic method and measurement method technology, which is applied in the direction of electric/magnetic exploration, radio wave measurement system, measurement device, etc. The effect of avoiding other interference, improving abnormal resolution, and reducing the effect of mutual inductance

Pending Publication Date: 2022-07-29
JILIN UNIV
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Problems solved by technology

Although the optimal turns ratio can be obtained in theory, there is a certain deviation between the theoretical calculation and the actual application; and the winding method is to repeatedly adjust the radius of the receiving coil to make turns, the process is cumbersome,
[0008] Therefore, the traditional measurement method cannot eliminate the influence of the primary field, and although most of the currently disclosed measurement methods can weaken or eliminate the influence of the primary field, it will cause the energy of the launch field to be weakened or limited by device parameters

Method used

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  • Plane gradient measurement method based on transient electromagnetic method
  • Plane gradient measurement method based on transient electromagnetic method
  • Plane gradient measurement method based on transient electromagnetic method

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Embodiment Construction

[0026] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0027] see figure 1 As shown, a plane gradient measurement method based on transient electromagnetic method, the method includes:

[0028] The excitation current is emitted through the transmitter coil;

[0029] Collect the signals of two receiving coils with the same specifications. The geometric centers of the two receiving coils with the same specifications are symmetrical relative to the geometric center of the transmitting coil. The planes where the two receiving coils are located are coplanar with the plane where the transmitting coils are located, and the geometric centers are at On the same line; the tran...

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Abstract

The invention belongs to the technical field of transient electromagnetic signal measurement in geophysical exploration, and particularly relates to a plane gradient measurement method based on a transient electromagnetic method. The method comprises the following steps: transmitting excitation current through a transmitting coil; signals of two receiving coils with the same specification are collected, the geometric centers of the two receiving coils with the same specification are symmetrical relative to the geometric center of the transmitting coil, the plane where the two receiving coils are located and the plane where the transmitting coil is located are coplanar, and the geometric centers are located on the same straight line; the induced voltage attenuation curves of the signals received by the two receiving coils are subtracted to obtain the gradient value of the induced voltage, and the gradient value can be used for analyzing the condition of the underground anomalous body after being inverted. According to the method, when the emission current is turned off, the gradient value of the secondary field generated by the underground medium and received by the receiving coil is calculated to be used for analyzing the condition of the underground anomalous body, and the primary field can be completely eliminated.

Description

technical field [0001] The invention belongs to the technical field of transient electromagnetic signal measurement in geophysical exploration, in particular to a plane gradient measurement method based on a transient electromagnetic method. Background technique [0002] The transient electromagnetic method is an important measurement method in geophysical exploration. This method uses a magnetic source or an electrical source to transmit a pulsed electromagnetic field to the ground. The purpose of measuring the underground electrical parameters can be achieved by analyzing the response information. At present, this method is mainly used in coal well hazard exploration, groundwater measurement, mineral resource exploration and other fields. [0003] At present, the common method of transient electromagnetic method is to use overlapping loop coils, which have strong mutual inductance, and after the emission current is turned off, the influence of the turn-off time will gener...

Claims

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Application Information

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IPC IPC(8): G01V3/10G01V3/38
CPCG01V3/10G01V3/38
Inventor 栾卉王瀛莹于一兵邱仕林嵇艳鞠
Owner JILIN UNIV
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