Shallow transient electromagnetic fine exploration method based on geometric factors

A transient electromagnetic and geometric factor technology, applied in the direction of electric/magnetic detection for well logging records, can solve the problems of poor accuracy and low resolution, and achieve high density, high spatial resolution, and high frequency components rich effect

Active Publication Date: 2019-01-04
BEIJING HUAHUI GEOXPLORA TECH CO LTD
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Problems solved by technology

[0003] The present invention mainly solves the problems of poor accuracy and low resolution encountered in shallow layers of existing transient electromagnetic surveys, and proposes a shallow transient electromagnetic fine prospecting method based on geometric factors, providing a set of measurement methods and two The description method of differential signal in secondary field

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  • Shallow transient electromagnetic fine exploration method based on geometric factors
  • Shallow transient electromagnetic fine exploration method based on geometric factors
  • Shallow transient electromagnetic fine exploration method based on geometric factors

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] The present invention provides a shallow 200-meter comprehensive measurement method that is transmitted in a shallow shallow hole, received in a shallow hole and on the ground, that is, a shallow transient electromagnetic fine exploration method based on geometric factors, through a limited space With the help of geometric factors of electromagnetic induction and time-domain waveform shapes, the amplitude information and phase information of transient waveforms are used to process densely collected data to achieve high-precision exploration. The present invention is applicable to fine resistivity exploration of 200 meters underground shallow layer, and the specific process is as follows:

[0027] Step 1, according to the actual situation, drill multiple holes in the ground, the depth of each hole is between 20 meters and 50 meters, choose one of them as the tran...

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Abstract

The invention discloses a shallow transient electromagnetic fine exploration method based on geometric factors: holes are drilled on the ground, one hole is selected as an emitting hole and the otherholes are receiving holes, and an emitting array coil and Z-direction equally-spaced array receiving coils are placed in the emitting hole and are in hard connection with each other; XYZ three-component array receiving coils are placed at equal spacing in the receiving holes, and XYZ three-component array receiving coils are placed at equal spacing on the ground to constitute a rectangular measurement plane; a deep moving device is used to synchronously move the emitting array coil and the array receiving coils for measurement; the response waveforms received by all the array receiving coils are filtered and amplified and then converted into digital quantity which is transmitted to a ground computer; and the waveforms of the array receiving coils are processed. By using the method, a shallow layer can be collected with high density, collected signals can be processed according to the geometric factor theory of the secondary field of electromagnetic induction, and high-precision and high-resolution exploration of spatial distribution of resistivity anomaly bodies can be realized.

Description

technical field [0001] The invention belongs to the special technical field of underground foundation and underground structure exploration in the early stage of ground engineering construction, and in particular relates to a shallow transient electromagnetic fine exploration method based on geometric factors. Background technique [0002] Existing transient electromagnetic prospecting methods and instruments adopt ground transmission and ground reception (the vertical distance is 0); exploration. Since the transient electromagnetic response is formed after the transient electromagnetic energy diffuses in the formation, the secondary field generated by the eddy current field generated by the response field changes with the resistivity. The response value is a volume average result, and the transient response waveform at different times The shape changes slowly, and the deeper the detection depth, the lower the longitudinal resolution. Not only can it not be compared with th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/28
CPCG01V3/28
Inventor 沈建国朱少杰
Owner BEIJING HUAHUI GEOXPLORA TECH CO LTD
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