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Method for determining geologic body information based on relative error of mine transient electromagnetic secondary potentials

A transient electromagnetic and relative error technology, applied in the field of geophysical exploration of coal mines and mines, can solve the problems of inaccurate inversion results, difficulty in truly reflecting the shape characteristics and distance of anomalies, and accurate interpretation of detection distances. Achieve fast calculation speed, solve multi-solution problems, and high precision

Inactive Publication Date: 2018-12-21
陕西省煤田物探测绘有限公司
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Problems solved by technology

When the "multiplier" is inappropriate, the inversion result will be inaccurate, and it will be difficult to truly reflect the shape characteristics and distance of the abnormal body within the detection range, which will also have a certain impact on the accurate interpretation of the detection distance

Method used

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  • Method for determining geologic body information based on relative error of mine transient electromagnetic secondary potentials
  • Method for determining geologic body information based on relative error of mine transient electromagnetic secondary potentials
  • Method for determining geologic body information based on relative error of mine transient electromagnetic secondary potentials

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Embodiment

[0034] 1. Measured data collection

[0035] The detection location is a Shimen in the east of the south transportation lane of a certain graphite mine in Lutang. During underground construction, each detection point is arranged with 13 measurement points (such as figure 1 shown). The detection instrument used is the YCS512 mine transient electromagnetic instrument, and the overlapping loop device is used for the measurement. The normalized curve of the collected secondary potential is as follows figure 2 as shown in a.

[0036] 2. Determine the background field

[0037] Determine the mine transient electromagnetic secondary potential background field data at the position to be measured according to formula (1) Such as figure 2 As shown in b, i=1, 2, 3, ... N, N is equal to the number of measurements of mine transient electromagnetic secondary potential data.

[0038] 3. Abnormal extraction

[0039] 1) According to the formula (2), calculate the relative error of the s...

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Abstract

The invention discloses a method and a device for determining geologic body information based on a relative error of mine transient electromagnetic secondary potentials. The method comprises the stepsthat background field mine transient electromagnetic secondary potential data of a to-be-detected region is determined; mine transient electromagnetic secondary potential data of each observation point in the to-be-detected region is determined; and the relative error of the mine transient electromagnetic secondary potential data of each observation point in the to-be-measured region and the background field mine transient electromagnetic secondary potential data is calculated according to a given method to determine an abnormal position of the to-be-detected region. Through the method, it isnot needed to calculate apparent resistivity, and the abnormal region position can be acquired just by directly analyzing the relative error of collected original and secondary potentials; and the method is high in calculation speed and high in precision, and the problem of multiple solutions of the apparent resistivity can be solved.

Description

technical field [0001] The invention relates to the field of geophysical exploration of coal mines and mines, in particular to a method for determining geological body information by transient electromagnetic secondary potentials of mines. Background technique [0002] my country began to introduce the transient electromagnetic method in the early 1970s, and the research at this time was basically limited to the ground half-space. The research content mainly includes transient electromagnetic response calculation, forward modeling, inversion, imaging, numerical calculation methods, etc. Because this method has the advantages of being sensitive to low-resistance bodies, high lateral resolution, and small volume effects. [0003] In transient electromagnetic detection, apparent resistivity, as the main or even the only parameter of electromagnetic method data interpretation, plays a decisive role in the processing and interpretation of mine transient electromagnetic data. Mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/18
CPCG01V3/18
Inventor 崔江伟王施智王一凡万宏伟张龙科
Owner 陕西省煤田物探测绘有限公司
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