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A full-waveform inversion method suitable for complex collapse columns in coal seam floor

A full waveform inversion and coal seam floor technology, applied in the field of full waveform inversion, can solve the problems of collapse column detection and channel waves cannot be used as detection means

Active Publication Date: 2022-07-05
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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  • A full-waveform inversion method suitable for complex collapse columns in coal seam floor
  • A full-waveform inversion method suitable for complex collapse columns in coal seam floor
  • A full-waveform inversion method suitable for complex collapse columns in coal seam floor

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Embodiment Construction

[0041] The technical solutions in the embodiments herein will be clearly and completely described below with reference to the accompanying drawings in the embodiments herein. Obviously, the described embodiments are only a part of the embodiments herein, rather than all the embodiments. Based on the embodiments herein, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall 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. Multiple seismic sources are arranged at equal intervals on the roadway wall on one side of the coal seam working face; multiple geophones are arranged at an equal distance of 5m from each other on the roadway wall on the other side of the coal seam working face; There is a row of detectors, each detector is connected to the acquisition base station and the acquisition host through the main line, such as F...

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Abstract

The invention discloses a full-waveform inversion method suitable for complex collapse columns of coal seam floor. First, the observation data of the source is obtained, then the forward wave field of the source and the reverse wave field of the accompanying source are obtained through calculation, and then the velocity field is determined. The gradient expression of the model, then according to the forward wave field, the reverse wave field and the gradient calculation expression, the gradient of the velocity field model parameters is calculated, which is beneficial to obtain the accurate update direction of the velocity field model parameters. The model parameters are iteratively updated until the data residual reaches the set threshold or the number of iterative updates reaches the preset value, and the iterative update is stopped to determine the velocity field model parameters. At this time, the velocity field model of this parameter is used for full waveform inversion. Therefore, the present invention can accurately locate and detect the shape of the collapsed column with complex conditions under the coal seam floor, thereby providing data support for subsequent mining.

Description

technical field [0001] The invention relates to a full-waveform inversion method suitable for complex collapse columns of a coal seam floor, and belongs to the technical field of seismic exploration. Background technique [0002] The collapse pillar is a collapsed body formed by the collapse of the overlying rock at the top of the cave in the limestone underlying the coal measure, and it is a typical concealed vertical structure in the North China coalfield in my country. Due to its randomness and uncertainty, the induced water inrush has strong concealment, high speed, large water volume and strong destructiveness, which is extremely harmful to the safety production of coal mines. Seismic 3D exploration in the central and western regions where green coal resources are rich is affected by the surface topography, mining of shallow upper coal formation, multi-layered goaf and surface subsidence, and the detection accuracy of subsidence columns is greatly limited. The distance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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