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A Method and Device for Quantitatively Judging Abnormalities of Underground Targets

A determination method and technology of target objects, which are applied in the directions of measurement devices, geophysical measurements, radio wave measurement systems, etc., to achieve the effect of reducing artificiality

Active Publication Date: 2018-05-04
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0007] In order to solve the problem of the resolution ability of the instrument and the implementation of transient electromagnetics in the detection of underground targets in the prior art, the present invention provides a method and device for quantitatively determining the abnormality of underground targets, and uses geophysical methods to evaluate observation data , to quantitatively determine the anomalies of resolvable underground targets

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  • A Method and Device for Quantitatively Judging Abnormalities of Underground Targets
  • A Method and Device for Quantitatively Judging Abnormalities of Underground Targets
  • A Method and Device for Quantitatively Judging Abnormalities of Underground Targets

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Embodiment 1

[0068] When carrying out transient electromagnetic work in a survey area in Shanxi, the working parameters adopted are: transmitting coil 200m×200m, emission current I=10A, select a location with no abnormality near the survey area to measure the transient electromagnetic secondary induced voltage, and use it as Background field, the induced electromotive force curve after background field normalization is as follows image 3 shown. figure 1 The middle abscissa represents time, the unit is s, and the ordinate represents the induced electromotive force normalized by the background field, the unit is V / m 2 . and put image 3 The data corresponding to the curves are listed in Table 1.

[0069] Table 1 Secondary induced voltage data table of the background field in the area to be evaluated

[0070]

[0071]

[0072]

[0073] The working parameters when obtaining the transient electromagnetic secondary induction voltage curve of each observation point in the area to be...

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Abstract

The application provides an underground target body abnormality quantitative determination method and apparatus, and relates to the field of coal field hydrogeology and physical geography. The method comprises the steps of determining transient electromagnetic induced voltage data of a background field in a region to be evaluated; determining transient electromagnetic induced voltage data at each observation point in the region to be evaluated; and comparing the transient electromagnetic induced voltage data at each observation point in the region to be evaluated with the transient electromagnetic induced voltage data of the background field, to determine whether each observation point in the region to be evaluated is abnormal or not in a horizontal direction. Artificiality in the interpretation of transient electromagnetic data is reduced, and a reliable terrestrial physical basis is provided for geological interpretation of underground target bodies.

Description

technical field [0001] The invention relates to the fields of coalfield hydrogeology and geophysics, in particular to a method and device for quantitatively judging an abnormality of an underground target body. Background technique [0002] Transient electromagnetic (TEM) method is a time-domain artificial source electromagnetic detection method based on the principle of electromagnetic induction. It is excited by a step-shaped wave electromagnetic pulse, and uses an ungrounded loop to emit a primary field underground. After the primary field is turned off, the induced secondary field generated by the underground medium changes with time at the measuring point to achieve the search. A geophysical information extraction method for various geological targets. [0003] In the coal field, the transient electromagnetic method is widely used. When faced with geological problems such as searching for coal mine goafs, continuous tracking and advanced detection of coal mine roadway ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/10
CPCG01V3/10
Inventor 薛国强崔江伟底青云钟华森冯西会
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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