【摘要】 应用定向分布裂隙介质中弹性波场正演理论，导出各向异性介质吸收边界条件，对同一地质模型模拟出不同裂隙性质、不同裂隙密度的地面合成记录和VSP记录。结果表明，充填裂隙介质和干裂隙介质的地震波场特征有明显的差别，干裂隙介质的横波分裂现象更为明显。这种分裂现象与裂隙密度有关，裂隙密度越大，分裂现象越明显。同时还表明，地面合成记录的转换波分裂现象比VSP记录更明显，而地面记录反射横波分裂现象又不及VSP记录易于识别。更多还原

【Abstract】 By using the forward modeling theory of elastic wave field in directionally-fractured medium, we have ascertained absorbing boundary condition of anisotropic medium,and synthesized the surface-seismic and VSP data which result from same geologic model but reflect different fracture properties (or density). The analysis leads to the conclusion:·Wave field in fluid-filled fracture medium is very different from the wave field in dry crack medium.·Very obvious shear wave splitting happens in dry crack medium.·Wave splitting is related to fracture density,denser fractures causing more obvious splitting.·Synthetic surface seismic data show more obvious converted-wave splitting than synthetic VSP data, but less obvious reflected shear wave splitting than the VSP data.更多还原