Abstract:
For the prevention of coal and gas outburst hazard during coal mining, a method of high-resolution 3D seismic prediction of coal and gas outburst is established by using the characteristics of large amount of 3D seismic information in coal mines, good lateral continuity of seismic data and small sampling interval, and fusion with borehole logging data in the mining area. In this paper, through laboratory measurement, logging and VSP data analysis of rock elastic characteristics, we can grasp the qualitative and quantitative relationship between coal and rock physical properties parameters and apparent resistivity, natural gamma, gamma gamma, sonic time difference and other logging curves, and logging response characteristics of coal body structure to establish the logging curve recognition model of coal and gas outburst area and method. The high resolution 3d seismic inversion method of coal seam structure constrained by logging curve is researched and developed to realize the fine description of tectonic protruding coal. The three-dimensional three-component converted wave seismic exploration technology in coal mine is studied, and the fast and slow shear waves are separated by the coordinate rotation method, and the development degree of the seam crack is determined by the time difference of the fast and slow shear waves, and the space is precisely located. By studying the variation of seismic wave amplitude in gas-rich blocks, it is found that the seismic amplitude of gas outburst coal seam shows a downward trend with the increase of offset, while the seismic amplitude of non-outburst coal seam shows an upward trend with the increase of offset.