A method and device for detecting the burial depth of a coal seam
A technology of burial depth and detection method, which is applied in the detection field of coal seam burial depth, can solve problems such as the inability to calculate the burial depth of coal seam, and achieve the effect of avoiding errors and improving reliability
Active Publication Date: 2017-10-13
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
[0011] In order to overcome the influence of the static effect caused by the inhomogeneity of the surface resistivity, the present invention makes the translation of the apparent resistivity curve of the adjacent measuring point cause the problem that the burial depth of the coal seam cannot be calculated, and proposes a detection method and device for the burial depth of the coal seam
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Embodiment 1
[0096] Taking the actual observation data of a certain mining area as an example, the detection results of the coal seam burial depth in the embodiment of the present invention are described.
[0097] 1. Obtain the characteristic period parameters of the measured depth curve above the borehole:
[0098] (1) Conduct electromagnetic frequency sounding above the ZP1 borehole position in the survey area, and obtain the depth-sounding apparent resistivity curves at different frequencies above the borehole position (such as Figure 4 shown). Figure 4 In , the ordinate represents the apparent resistivity value measured above the ZP1 borehole, and the abscissa represents the frequency number.
[0099] (2) Determine the characteristic observation frequency number corresponding to the minimum value of the characteristic point in the bathymetric apparent resistivity curve as frequency No. 13. By looking up Table 1, the frequency value of No. 13 is f k =43.8Hz, by looking up Table 1, ...
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The invention discloses a detection method of the buried depth of a coal seam and a detection device of the buried depth of the coal seam, and relates to the field of geology and geophysics. A problem that the buried depth of the coal seam cannot be calculated and which is caused by a phenomenon of translation of an adjacent-measuring-point apparent resistivity curve due to a static effect influence caused by nonuniformity of surface electrical resistivity is overcome. The method comprises obtaining a sounding apparent resistivity curve of a to-be-evaluated detection point with a change of a detection frequency, determining a characteristic observation frequency corresponding to the apparent resistivity minimum on the sounding apparent resistivity curve, performing an analogy between the characteristic observation frequency of the detection point and a calculation coefficient template chart of the buried depth of a coal seam bottom plate of a detection region, and determining a buried depth value of the coal seam of the detection point. Through a geophysical electromagnetic detection manner, the buried depth of the coal seam is quantitatively calculated, an error brought by the translation of the adjacent-measuring-point apparent resistivity curve is prevented, and reliability of a geologic interpretation is improved.
Description
technical field [0001] The invention relates to the fields of geology and geophysics, in particular to a method and device for detecting the burial depth of coal seams. Background technique [0002] In the field of coal field application, the study of geophysical methods to determine the burial depth of coal seams is very meaningful. The detection depth of electrical prospecting has always been one of the important research contents of geophysical prospecting. Because whether it is construction design or data interpretation, it is necessary to determine in advance whether the methods, devices and instruments used can reach the target layer to complete the geological task; data, it is necessary to determine the geological information in which depth range they contain in order to give correct interpretation results. Because the estimation of the depth is so important, the research on the detection depth is accompanied by the development of the electrical and electromagnetic ...
Claims
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IPC IPC(8): G01V3/38
Inventor 薛国强钟华森底青云侯东洋马振军陈康
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI