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Method for detecting deep sand body of low-resistance coverage area

A detection method and coverage area technology, which are applied in the fields of deep uranium mine geological exploration and deep resource exploration, can solve the problems of high difficulty in fine identification of sand bodies and low resolution, achieve intelligence and objectification, improve the ability to distinguish, Suitable for promotion and application

Inactive Publication Date: 2019-05-21
核工业航测遥感中心
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for detecting deep sand bodies in low-resistivity overburden areas to solve the problems of low resolution and high difficulty in finely identifying sand bodies in existing sandstone-type uranium deposits due to the influence of low-resistivity overburden layers

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  • Method for detecting deep sand body of low-resistance coverage area
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  • Method for detecting deep sand body of low-resistance coverage area

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[0035] The present invention will be further elaborated below in conjunction with the examples, and the following examples are only for illustration and do not limit the protection scope of the present invention in any way. Procedures and methods not described in detail in the following examples are conventional methods well known in the art.

[0036] The application area of ​​this embodiment is Weijing area in Erlian Basin, Inner Mongolia.

[0037] like figure 1 As shown, a deep sand body detection method in a low-resistivity coverage area of ​​the present invention comprises the following steps:

[0038] Step (a): In the uranium mineralization prospect area, the survey points are arranged according to the main structural direction, the number of known boreholes is ≥ 1, at least one survey line passes through one of the known boreholes, and high-precision GPS (applied RTK (Real-time kinematic, real-time dynamic) measurement equipment of carrier phase difference technology) ...

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Abstract

The invention provides a method for detecting a deep sand body of a low-resistance coverage area. The method comprises the following steps of in a uranium metallogenesis prospective area, arranging measuring lines according to an outstanding tectonic direction, wherein the number of drilling holes is higher than or equal with 1, at least one measuring line passes through one known drilling hole, and performing measuring point positioning by means of high-precision GPS and a forest compass; performing wide-frequency magnetotelluric method measurement by means of a continuous tensor observing device according to a platform type electrode arranging method; performing impedance calculation on the acquired data, obtaining visual resistivity and phase information, performing two-dimensional datainversion, drawing an inversion resistivity section view according to an inversion result; according to a known drilling hole exposure result, performing fine layering on the inversion resistivity section view, and extracting an electric characteristic of the sand-containing sand body; and according to the electric characteristic of the sand body, predicating the distribution range of the deep sand body by means of artificial intelligence technology such as neural network method. The method settles problems such as low depth measuring resolution and high sand body identification difficulty inthe low-resistance coverage area, and realizes an excellent effect in sand body prediction.

Description

technical field [0001] The invention belongs to the technical field of deep uranium ore geological exploration and deep resource detection, and in particular relates to a deep sand body detection method in a low-resistance coverage area. Background technique [0002] Sandstone-type uranium deposits are mostly produced in sedimentary basins. Due to the influence of low-resistivity overburden, sounding is difficult. In order to detect sandstone-type uranium deposits, the controlled source audio magnetotelluric method, audio frequency magnetotelluric measurement (AMT) method or magnetotelluric measurement (MT) method is usually used. Although the inversion depth can reach 800 m by using the controllable source audio magnetotelluric measurement, it is difficult to reach the 800 m sounding depth if the deep low-resistivity layer becomes thicker. Using audio-frequency magnetotelluric measurement (AMT), even if the lowest frequency can reach 1Hz, according to the principle of skin...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/08G01V3/38G01S19/43
Inventor 孔志召全旭东刘波何昕欣焦智伟张俊伟许第桥张正阳
Owner 核工业航测遥感中心
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