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Field?audio magnetotelluric data acquisition method

An audio magnetotelluric and data acquisition technology, applied in the field of geophysical exploration, can solve problems such as not meeting the needs of exploration, and achieve the effect of improving work efficiency and reducing workload

Active Publication Date: 2014-05-21
BEIJING RES INST OF URANIUM GEOLOGY
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Problems solved by technology

[0012] At present, many exploration tasks need to find out the underground geological structure in detail and perform three-dimensional imaging of the underground medium, which requires high-density area measurement data, improving the exploration resolution, and finely solving the corresponding geological problems. The two audio magnetotelluric data acquisition methods used in the

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  • Field?audio magnetotelluric data acquisition method

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Embodiment Construction

[0035] Attached below image 3The implementation mode of the separated high-density area audio magnetotelluric measurement method provided by the present invention is described:

[0036] A data collection method of field audio frequency magnetotellurics, comprising the following steps:

[0037] (1) Design the coordinates of survey lines and survey points collected by area-based AMT indoors: the north-south survey lines are numbered L1, L2...L7, and the distance between survey points is 20m; the east-west survey lines are numbered M1, M2... M7, the distance between measuring points is 20m; the measuring points in the middle of the network are numbered LiMj, i∈(1, 2, 3, 4, 5, 6, 7), j∈(1, 2, 3, 4, 5, 6, 7);

[0038] (2) Use measuring equipment to locate the designed surveying line and measuring points on the spot, and remove obstacles on the north-south surveying line; the measuring equipment can use theodolite, but at present, differential GPS is commonly used, and commercial...

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Abstract

The invention belongs to the field of geophysical exploration and particularly relates to a field?audio magnetotelluric (AMT) data acquisition method. The method specifically comprises the following steps: (1) measuring lines?and?measuring point coordinates for area AMT acquisition are designed indoors; (2) measuring equipment is used for carrying out on-site positioning on the designed measuring lines?and?the measuring point coordinates and obstacles on the north-south measuring line are removed; (3) electrodes are laid; (4) a north-south horizontal magnetic?sensor Hx and an east-west horizontal magnetic?sensor Hy are laid in a central measuring point L4M4; (5) the potential ULiMj of each measuring point and the magnetic field in the center of a measuring net are measured; (6) the measuring net is moved and work in the whole measuring area is finished; (7) measured potentials of four points around the measuring point are used to calculate the electric field intensity; (8) tensor impedance, apparent resistivity, and phase data of each measuring point are calculated; and (9) tensor impedance and apparent resistivity of each measuring point are calculated to obtain homogenized high-density impedance, apparent resistivity and phase data.

Description

technical field [0001] The invention belongs to the field of geophysical exploration, and in particular relates to a field audio magnetotelluric (AMT) data collection method. Background technique [0002] Audio-frequency magnetotelluric method (AMT) is a frequency-domain electromagnetic prospecting method based on the principle of Maxwell's electromagnetic induction and utilizing the difference in rock conductivity. When changing electromagnetic waves are incident on the ground, the underground electrical medium will generate a secondary field due to electromagnetic induction. The electrical distribution of the underground medium can be obtained by measuring this induced field on the surface and through related data processing. When electromagnetic waves propagate underground, their field strength attenuates with depth. Low-frequency electromagnetic waves attenuate slowly and can penetrate deep geological bodies. High-frequency electromagnetic waves attenuate quickly and pen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/12
Inventor 刘祜程纪星腰善丛乔宝强
Owner BEIJING RES INST OF URANIUM GEOLOGY
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