彭苏萍:煤与瓦斯突出灾害隐患高分辨三维地震预测方法

    High-resolution 3D Seismic Prediction Method for Hidden Dangers of Coal and Gas Outburst Hazard

    • 摘要: 针对煤炭开采过程中的煤与瓦斯突出灾害防治问题,提出了利用煤矿三维地震探测信息量大、探测数据横向连续性好、采样间距小的特点,通过与矿区内钻孔测井数据融合,建立煤与瓦斯突出部位高分辨三维地震预测的方法。通过岩石弹性特征的实验室测定、测井和VSP资料分析,掌握煤、岩石物性参数与视电阻率、自然伽玛、伽玛伽玛、声波时差等测井曲线之间的定性和定量关系以及煤体结构的测井响应特征,建立煤与瓦斯突出部位测井曲线识别模型和方法;研究和开发以测井曲线为约束的煤层结构高分辨率三维地震反演方法,实现了对构造突出煤体的精细描述;开展对煤矿三维三分量转换波地震勘探技术的研究,利用坐标旋转法实现快慢横波的分离,由快慢横波的时差确定煤层裂隙的发育程度,并在空间上进行了精确定位;研究瓦斯富集区块地震波振幅变化规律,发现瓦斯突出煤层地震振幅随偏移距的增大呈下降趋势,而非突出煤层的地震振幅随着偏移距的增大呈上升趋势。

       

      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.

       

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