Method and device for evaluating apparent water inflow of coal seam roof

A technology for coal seam roof and water inflow, which is used in measurement devices, re-radiation of sound waves, and electrical/magnetic exploration.

Active Publication Date: 2016-06-08
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using geophysical methods to quickly realize the indirect quantitative assessment of the water-richness of the coal seam roof has always been blank.

Method used

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  • Method and device for evaluating apparent water inflow of coal seam roof
  • Method and device for evaluating apparent water inflow of coal seam roof
  • Method and device for evaluating apparent water inflow of coal seam roof

Examples

Experimental program
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Embodiment 1

[0075] 1. According to the drilling data, determine the burial depth of the coal seam roof at the drilling position

[0076] The stratum in the area to be evaluated is relatively flat, and the dip angle of the stratum is less than 5°. According to the test results of the No. 20 drill core, the lithology of the roof of the coal seam includes: clay, mudstone, and siltstone, and the lithology of the floor of the coal seam includes: conglomerate, coarse sandstone, etc. It is off-white to dark gray, with tuffaceous cementation, poor cementation, loose, and is divided into multiple layers by discontinuous and continuous aquifers developed in it. It is a composite aquifer with a total thickness of 60m (underground 110m to 170m ). It can be seen from the drilling electrical logging data that the apparent resistivity of the coal seam roof is small, while the apparent resistivity of the coal seam itself and the coal seam floor are relatively large. The transient electromagnetic method...

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Abstract

The invention provides a method and device for evaluating an apparent water inflow of a coal seam roof and relates to the field of hydrology geology of a coal field and physical geography. The method comprises the following steps: determining a calibrated apparent resistivity data value corresponding to a burying depth of the coal seam roof at a drilled position; determining a calibrated actual water inflow of the coal seam roof at the drilled position; according to the relation between the calibrated apparent resistivity data value and the calibrated actual water inflow, determining an inflow relative coefficient of the coal seam roof; and determining the apparent water inflow of a position point of the coal seam roof in a region to be evaluated according to an acquired apparent resistivity value corresponding to the position point of the coal seam roof in the region to be evaluated and the inflow relative coefficient. With the adoption of the method and device provided by the invention, the water yield property of the coal seam roof of other positions except a drilled hole can be quantitatively predicated and evaluated, so that important reference evidences are provided for safety production of coal mines.

Description

technical field [0001] The invention relates to the fields of coalfield hydrogeology and geophysics, in particular to a method and a device for evaluating the apparent water inflow of a coal seam roof. Background technique [0002] Many coal resources in our country are under complex hydrogeological conditions. As far as the proven coal reserves are concerned, the coal reserves threatened by groundwater account for about 27% of the total reserves. Water damage has always been the main problem perplexing the safety production of coal mines. In order to ensure the safety of coal mines during infrastructure construction and production, in the early stage of well construction, it is necessary to investigate in detail the water-richness of the underground aquifer, the hydraulic connection between the aquifers, and the water conductivity of the structure in the mining area. An important subject of coalfield hydrogeological research. Ascertaining the complex hydrogeological condi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/38
CPCG01V3/38
Inventor 薛国强陈康底青云吴燕清田忠斌赵育刚
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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