裂缝介质中不同震源横波分裂现象的数值模拟

摘要

采用TTI介质中二维三分量一阶交错网格应力-速度弹性波方程，模拟胀缩源、垂直集中力源、剪切源在垂直裂缝介质中的井间地震波场，分析了不同方位角情况下波场的传播特征，并讨论了横波分裂时的能量分配情况。结果表明：地震波从各向同性介质进入各向异性介质时会观测到快慢横波；在一定方位角的情况下，垂直裂缝介质中会得到快慢横波，这为进一步分析横波分裂特征和地震实际数据提供了依据。%The paper introduces the elastic wave equation of 2D three components first-order staggered-grid stress and velocity, simulates wave field of dilatational source, vertical concentrated force source, shear source in fracture media, analyzes wave propagation characteristics with different azimuth angle. The result shows that fast and slow shear wave will be observed when seismic wave propagates in fracture media. This work will provide a strong basis for further analysis of shear wave splitting characteristics and actual seismic data.