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Side-excited loop source ground well transient electromagnetic detection method and system

A technology of transient electromagnetic and detection method, which is applied in the direction of electric/magnetic detection for well logging records, and can solve problems such as weak detection effect, poor coupling effect between magnetic field and plate-shaped body, and failure to obtain abnormal response.

Active Publication Date: 2019-02-15
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this detection device, the coupling effect between the magnetic field generated by the ungrounded loop and the plate-shaped object is poor, and the plate-shaped object cannot induce a strong secondary field. Even if the probe is received in a nearby drill hole, it cannot obtain a strong Abnormal response, so the detection effect of this method is weak for steep or upright low-resistance plate-shaped objects

Method used

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  • Side-excited loop source ground well transient electromagnetic detection method and system
  • Side-excited loop source ground well transient electromagnetic detection method and system
  • Side-excited loop source ground well transient electromagnetic detection method and system

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Embodiment

[0029] In this embodiment, a method for detecting transient electromagnetic waves in wells with a loop source and a lateral excitation is provided.

[0030] figure 1 A schematic diagram of the detection device in the embodiment of the present invention is illustrated; figure 1 The description is only taken as an example of early detection of geological anomalies along coal seams, but it should be noted that this description is only exemplary, and the present invention is not limited to the scheme of early detection of geological anomalies along coal seams.

specific Embodiment approach

[0031] The specific embodiment of the present invention comprises following steps:

[0032] (1) If there is no drill hole in the target stratum to be detected underground, drill holes need to be drilled first, in front of the head 11 of the roadway 10, drill holes along the coal seam 5 along the driving direction, according to the depth of the water-bearing geological anomaly body 6 or the detection depth The drilling depth needs to be decided.

[0033] (2) According to the basic information of the target body and the calculation results of indoor data, the ground loop source 2 excited from the side is arranged in a targeted and reasonable manner. The line produces the best coupling state with the water-bearing geological anomaly body.

[0034] (3) The launch loop 2 is connected to the ground launch equipment to form a launch system. The return line is sent to the ground to supply the current 3 carrying the DC square wave, and the primary field 7 is sent underground, wherein...

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Abstract

The invention relates to a transient electromagnetic detection method and system, belongs to the technical field of geophysical exploration, and specifically relates to a side-excited loop source ground well transient electromagnetic detection method and system. By exciting an anomalous body from the side through an ungrounded loop, a good coupling effect can be produced on a steep or upright low-resistance slab body. By using a receiving device to receive secondary field signals in a roadway or borehole, strong response signals can be received. By using a proposed data processing method to invert the received signals, an accurate interpretation result can be obtained.

Description

technical field [0001] The invention relates to a transient electromagnetic detection method and system, belonging to the technical field of geophysical exploration, in particular to a lateral excitation loop source ground well transient electromagnetic detection method and system. Background technique [0002] The application of geophysical methods to the detection of underground mined-out areas or low-resistance geological bodies was early, and there are many types of methods, and the results are also good. Among them, the method with better effect on water-bearing detection is mainly the electromagnetic method, which is specific and specific. Including DC electrical method represented by high density and induction electrical method represented by transient electromagnetic. For the transient electromagnetic method, there are many methods such as the ground large fixed source transient electromagnetic method and the ground well transient electromagnetic method. [0003] Tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/26
CPCG01V3/26
Inventor 王鹏冯宏郑士田苏超程思远
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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