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基于二维-二分量弹性波方程交错网格高阶有限差分法数值模拟,对单相介质原生煤、单相介质构造煤和双相介质的构造煤二维层状模型进行了弹性波场数值模拟,并利用了属性技术对模拟的共炮点记录进行了分析。结果表明:瓦斯突出煤体与煤层气富集煤体跟原生煤存在着明显的差异。当地下煤层中含有瓦斯时,其地震波场特征相对于不含瓦斯时存在明显变化,含瓦斯双相介质对地震波的有效平均频率和相对振幅,特别是积分振幅与时差之积地震属性的影响很大。可以利用地震属性技术研究瓦斯突出煤体与煤层气的富集煤体。
Based on the high-order finite difference method of staggered-grid finite element method for two-dimensional elastic wave equation and two-dimensional elastic wave equation, the two-dimensional layered model of tectonic coal with single phase medium primary coal, single phase medium coal and two- Simulation, and the use of attribute techniques to simulate the common shot records were analyzed. The results show that there is a clear difference between coal-fired gas and coalbed methane-enriched coal and primary coal. When the underground coal seam contains gas, the characteristics of the seismic wave field have obvious changes compared with those without gas. The influence of gas-bearing dual-phase medium on the effective average frequency and relative amplitude of the seismic wave, especially the product product of integral amplitude and time difference Big. Seismic attribute techniques can be used to study the enrichment of coal in gas outburst and CBM.