A laterally mobile shallow transient electromagnetic fine exploration method

A transient electromagnetic and lateral movement technology, applied in electric/magnetic exploration, radio wave measurement systems, instruments, etc., can solve the problems of low resolution, poor response, poor precision, etc., achieve high signal-to-noise ratio and improve sensitivity , large effect

Active Publication Date: 2020-05-19
BEIJING HUAHUI GEOXPLORA TECH CO LTD
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Problems solved by technology

Even in the face of strong shielding, the poor response can still effectively display the change of the conductivity interface, thus effectively solving the problems of poor precision and low resolution encountered in shallow layers by existing transient electromagnetic surveys

Method used

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  • A laterally mobile shallow transient electromagnetic fine exploration method
  • A laterally mobile shallow transient electromagnetic fine exploration method
  • A laterally mobile shallow transient electromagnetic fine exploration method

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Experimental program
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Embodiment Construction

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] The laterally mobile shallow transient electromagnetic fine exploration method of the present invention is a fine resistivity exploration method for shallow layers of 20 to 100 meters underground, through high-density measurement in a limited space on the ground, with the help of electromagnetic induction response shape and In the response, the shape of the time-domain waveform difference that reflects the difference in the formation conductivity is used to identify the underground conductivity interface by using the position of the maximum value of the transient waveform with the variation of the measurement point to achieve high-precision exploration.

[0032] The horizontal mobile shallow transient electromagnetic fine exploration method of the present invention comprises the following steps:

[0033] The first step: install the transmitting coil and the arra...

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Abstract

The invention discloses a transverse moving transient electromagnetic fine exploration method for shallow. The method comprises the steps of: coaxially mounting a transmitting coil and an array receiving coil together, fixing them in an insulating cylinder to form a measuring probe; horizontally placing the measuring probe on the ground; continuously moving the measuring probe; recording the coordinates of the measuring probe by a XY positioning device; uploading the coordinates to a computer; recording the moving distance; continuously supplying the electrical energy to a transmitting circuitby a ground control module and a power supply; continuously providing a transmitting logic; instantaneously transmitting current and voltage shocks by the transmitting circuit after receiving the transmitting logic; continuously transmitting by the transmitting coil according to the designed transmitting logic, and at the same time, simultaneously receiving a response waveform by the array receiving coil according to the synchronization of transmission; processing, by a receiving module and an analog signal processing module, the response waveform received by each receiving coil in the arrayreceiving coil; converting the response waveform into a digital quantity by an AD conversion module; storing the digital quantity into the computer; and obtaining a conductivity interface of the formation in response to the waveform processing by the computer.

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 more specifically relates to a laterally moving shallow transient electromagnetic fine exploration method. Background technique [0002] Existing transient electromagnetic prospecting methods and instruments adopt the longitudinal transmission on the ground, that is, the transmitting coil is parallel to the ground, the excited magnetic field is perpendicular to the ground, and the ground receives longitudinally (the vertical distance is 0); The eddy current is axisymmetric and mainly detects the conductivity of the formation below the transmitting coil. The greater the excitation energy, the deeper the detection depth. Reducing the radius of the transmitting and receiving coils can reduce the detection depth and realize shallow exploration. The result measured by this method is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/10
CPCG01V3/10
Inventor 沈建国沈永进
Owner BEIJING HUAHUI GEOXPLORA TECH CO LTD
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