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采用线性滑移(Linear Slip Deformation)裂隙介质模型、各向异性弹性波模拟方法,对含裂隙煤层进行了2D2C(二维二分量)单炮记录模拟与分析。结果表明:煤层含裂隙后与不含裂隙时相比,反射时差的变化已不足以识别,但由于波速的改变会使煤层顶底界面的波阻抗发生变化,从而引起波的动力学特征的改变,AVO现象尤其明显。当裂隙为非垂直时,炮点两侧的反射波能量和振幅出现不对称现象。x分量和z分量的特征明显不同,转换波主要记录在x分量上,横波在x分量上有不可忽视的能量。因此,应用各向异性理论、利用多分量转换波研究煤层裂隙的特征是可能的。
A 2D2C (one-dimensional two-component) single shot record simulation and analysis of fractured coal seams was carried out by using the linear slip Deformation fracture medium model and the anisotropic elastic wave simulation method. The results show that the change of reflection time difference is not enough to distinguish the coal seam with and without fissures, but the change of wave velocity will change the wave impedance of the top and bottom interface of the coal seam and cause the change of the dynamic characteristics of the wave , AVO phenomenon is particularly obvious. When the fissure is non-vertical, the energy and amplitude of the reflected waves on both sides of the shot point appear asymmetric. The features of the x and z components are significantly different. The converted wave is mainly recorded on the x component, and the shear wave has unavoidable energy on the x component. Therefore, it is possible to apply the anisotropic theory to study the characteristics of coal seam fractures by using multi-component converted wave.