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Full-waveform inversion method suitable for complex collapse column of coal seam floor

A technology of full-waveform inversion and coal seam floor, applied in the field of full-waveform inversion, can solve the problems of collapse column detection, slot wave cannot be used as a detection method, etc.

Active Publication Date: 2021-09-10
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0004] In areas where channel waves are developed, channel wave exploration is the main coal seam exploration method. However, if the coal seam is relatively thin or the channel waves are not developed in the coal seam, channel waves cannot be used as a detection method. Waves with Possibility of Falling Column Detection

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  • Full-waveform inversion method suitable for complex collapse column of coal seam floor
  • Full-waveform inversion method suitable for complex collapse column of coal seam floor
  • Full-waveform inversion method suitable for complex collapse column of coal seam floor

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[0041] The following will clearly and completely describe the technical solutions in the embodiments herein in conjunction with the accompanying drawings in the embodiments herein. Obviously, the described embodiments are only some of the embodiments herein, not all of them. Based on the embodiments herein, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the scope of protection herein.

[0042] In the inversion method of the embodiment of the present invention, the specific steps are:

[0043] A. Arrange multiple seismic sources at equal distances from each other on the roadway wall on one side of the coal seam working face; arrange multiple geophones at equal distances of 5m from each other on the roadway wall on the other side of the coal seam working face, and equidistantly space 5m at the cut eye of the coal seam working face There is a row of detectors, and each detector is connected to the acquisition bas...

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Abstract

The invention discloses a full-waveform inversion method suitable for a complex collapse column of a coal seam floor, comprising the following steps that the observation data of a seismic source is obtained, obtaining a forward wave field of the seismic source and a backward wave field of an adjoint source through calculation, a gradient expression of a velocity field model is determined, and the velocity field model is calculated according to the forward wave field, the backward wave field and the gradient calculation expression; the gradient of the velocity field model parameters is obtained through calculation, the accurate updating direction of the velocity field model parameters can be obtained, finally, the velocity field model parameters are iteratively updated until the data residual error reaches a set threshold value or the number of iteration updating times reaches a preset value, iteration updating is stopped, the velocity field model parameters are determined, and full-waveform inversion is carried out by adopting a velocity field model of the parameters. Therefore, accurate positioning and form detection can be carried out on the collapse column with complex conditions below the coal seam floor, so that data support is provided for subsequent mining.

Description

technical field [0001] The invention relates to a full waveform inversion method suitable for complex subsidence columns of coal seam floors, belonging to the technical field of seismic exploration. Background technique [0002] The collapse column is a collapse body formed by the collapse of the overlying rock at the top of the karst cave in the underlying limestone of the coal measures, and it is a typical concealed vertical structure in the North China type coalfield in my country. Because of its randomness and uncertainty, the water inrush induced by it has strong concealment, fast speed, large water volume and strong destructiveness, which is extremely harmful to the safety of coal mine production. Seismic 3D exploration in the central and western regions with rich green coal resources is affected by the surface topography, shallow upper coal mining, multi-layer goaf and surface subsidence, the detection accuracy of collapsed columns is greatly limited, mine seismic exp...

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Application Information

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IPC IPC(8): G01V1/30G01V1/20
CPCG01V1/303G01V1/30G01V1/20G01V2210/6222G01V2210/1429Y02A90/30
Inventor 方金伟王勃刘盛东章俊王一帆孙华超丁昕
Owner CHINA UNIV OF MINING & TECH
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