Device and method of multi-channel transient electromagnetic method three-dimensional detection

A transient electromagnetic method and three-dimensional detection technology, which is used in measurement devices, electromagnetic/magnetic exploration, radio wave measurement systems, etc., can solve the problems of voltage signal attenuation, unfavorable fine detection, and difficulty in obtaining better quality signals. Achieve the effect of strong applicability and high data collection accuracy

Active Publication Date: 2016-09-07
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

It can be seen from the above formula that with the increase of the offset r, the received voltage signal will attenuate sharply, and it is difficult to obtain a bette

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  • Device and method of multi-channel transient electromagnetic method three-dimensional detection
  • Device and method of multi-channel transient electromagnetic method three-dimensional detection
  • Device and method of multi-channel transient electromagnetic method three-dimensional detection

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Embodiment

[0072] When the transient electromagnetic work was carried out in a survey area, the ore body was buried at a depth of about 1000m, and it occurred in the Carboniferous Huanglong Formation-Chuanshan Formation. . The ore body spreads widely on the plane, but changes little in depth. The ore body is mainly composed of copper-bearing skarn, copper-bearing pyrite, copper-bearing serpentine, and copper-bearing pyrrhotite. The immediate surrounding rocks of the orebody chassis are rocks of the Gaolishan Formation of the lower Carboniferous system and quartz diorite, mainly hornfelized siltstone. The immediate topping rock of the ore body is the marble of the Huanglong Formation, and the upper part is the marble of the Qixia Formation. The structure of the ore body is simple, and the degree of research is relatively high. There is a good difference in electrical characteristics between the ore body and the surrounding rock. The ore body itself has good electrical conductivity, whi...

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Abstract

This invention provides a device and method of multi-channel transient electromagnetic method three-dimensional detection. The device comprises an emitting electrode pair and a distributed collection station which is arranged at a position with a first preset distance to the emitting electrode pair. The distributed collection station comprises multiple electrode pairs which are arranged on multiple measurement lines, and each of the measurement lines is provided with a receiving electrode pair or multiple receiving electrode pairs. The method comprises a step of carrying out equivalent conversion of the transient electromagnetic observation data obtained by the distributed collection station into ground virtual seismic field data, a step of obtaining the virtual seismic data of any point in a ground through the ground virtual seismic field data obtained through conversion, and a step of determining the boundary surface of a ground target body to a surrounding rock according to the seismic data of any point in the ground. The practicability is strong, the data collection precision is high, a fine interpretation cross section can be obtained, and the boundary surface of the ground target body and the surrounding rock is intepreted visually.

Description

technical field [0001] The invention relates to the fields of coalfield hydrogeology and geophysics, in particular to a device and method for three-dimensional detection by multi-channel transient electromagnetic method. Background technique [0002] The original idea of ​​MTEM (Multi-channel Transient Electromagnetic Method) is to estimate the distribution of underground natural gas reservoirs by extracting the difference between EM data acquired at different times at the same location. [0003] like figure 1 As shown in , it is a schematic diagram of the field layout of the device for the multi-channel transient electromagnetic method experiment. The "dot" on the figure indicates the position of each emitter pole in the test, and the "cross" indicates the position of the observation point. In the test, the system conducts array multi-component emission along the survey line, and array multi-field and multi-component observation. The transmitter transmits a bipolar squar...

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Application Information

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IPC IPC(8): G01V3/08G01V3/38
CPCG01V3/08G01V3/38
Inventor 底青云李貅薛国强侯东洋
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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