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Ground controlled source magnetotelluric method based on axial collinear manner

An axial and ground technology, which is applied in the field of ground controllable source electromagnetic exploration based on the axial co-linear method, can solve the problems such as the inability to reflect the underground geological conditions in a large range and the single frequency.

Inactive Publication Date: 2014-09-03
JILIN UNIV
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Problems solved by technology

[0004] In the marine electromagnetic survey, there is a dragging survey method based on the axial and colinear direction, but the frequency used in the marine electromagnetic survey is single, which cannot reflect the underground geological conditions in a large range

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  • Ground controlled source magnetotelluric method based on axial collinear manner
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  • Ground controlled source magnetotelluric method based on axial collinear manner

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Embodiment Construction

[0033] Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:

[0034] figure 1 It is the field survey layout diagram of the axial co-linear method, including the transmitting system and the receiving system, and the survey area is arranged in the following way:

[0035] Such as figure 1 The planar Cartesian coordinate system shown in , the artificial emission source and the survey line are arranged along the x direction, and the position of the survey area is r≥2δ from the emission source in the x direction max In addition, the y-direction starts from the center of the emission source and the radiation range is within 30°.

[0036] The survey line starts from line 0 and is equally spaced to cover the entire survey area. The survey line spacing is set according to the detection accuracy and requirements, generally a specific value of 50-500m.

[0037] The measuring points on each measuring line are arranged at e...

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Abstract

The invention relates to a ground controllable source magnetotelluric method based on an axial collinear manner. Through changing a distribution manner of a receiving system, the receiving system is axially distributed along a transmitting system; through measuring horizontal electric field intensities Ex of all receiving points axially distributed, an apparent resistivity is figured out. Compared with the prior art, the ground controllable source magnetotelluric method has the advantages of being sensitive in reflection of information of an underground high-resistance body and stronger in resolution capability of underground electrical resistivity by adopting a manner of arranging the transmitting system and the receiving system axially and collinearly, being capable of more clearly reflecting details of geologic body spatial distribution, being sensitive in reflection of deep-part electrical-property change and strong in resolution capability, and reducing the measurement of a magnetic field component Hy in a vertical direction by only measuring an electric field component Ex in a horizontal direction to ensure that the measurement process is simpler and more convenient and the introduction of noise is reduced so that the signal to noise ratio is favorably increased. A factor of influence of airwaves is calculated in a data processing flow, and is removed from a received signal, thus the signal to noise ratio and the confidence level of a measurement result are improved.

Description

Technical field: [0001] The invention relates to a ground controllable source electromagnetic prospecting method, in particular to a ground controllable source electromagnetic prospecting method based on an axial alignment method. technical background: [0002] Controlled Source Andio-frequency Magnetotelluric (abbreviated as CSAMT) is an artificial source frequency domain electromagnetic sounding method developed on the basis of the magnetotelluric method (MT). The promotion and development of exploration has an important influence in many fields such as ore prospecting, water prospecting, engineering construction, and disaster prevention and control. This method generates an electromagnetic field of corresponding frequency by feeding an audio current into a finitely long grounded wire or an ungrounded coil, receives mutually orthogonal electromagnetic field response components on a survey line more than ten kilometers away from the emission source, and interprets them by i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/12G01V3/08
Inventor 刘长胜曾新森胡瑞华周逢道刘立超史志辉康利利
Owner JILIN UNIV
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