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通过数值模拟研究了HTI介质中利用宽方位多分量地震数据进行各向异性分析时会影响结果的几种因素,模拟了PP与PS波的方位各向异性响应,分析了利用PP与PS波随方位变化的地震属性进行裂缝检测的可行性。结果显示:针对HTI介质的椭圆方位各向异性分析对地震数据的炮检距分布范围有限制,并且PS波数据适合于椭圆方位各向异性分析的炮检距范围要明显大于PP波数据,其显示出的方位各向异性特征也比PP波更加明显。PS波方位振幅拟合的椭圆长轴方向垂直于裂缝方向,而PP波方位振幅拟合的椭圆长轴平行于裂缝方向。与PP波类似,PS波R分量的层间旅行时也具有椭圆方位各向异性特征,其长轴方向垂直于裂缝方向。PS波R分量与PP波的方位振幅属性与层间旅行时属性均显示了与裂缝密度的相关性,当数据的炮检距范围合适时,拟合椭圆的长短轴之比可以用于刻画裂缝的相对密度。
Several factors affecting the results of anisotropy analysis using wide-azimuth multi-component seismic data in HTI media are studied by numerical simulation. The azimuthal anisotropy responses of PP and PS waves are simulated. Feasibility of Crack Detection Based on Seismic Attributes with Change of Bearing. The results show that the azimuthal azimuthal anisotropy for HTI media has limited range of offset distribution for seismic data and the range of offset for PS azimuthal data is obviously larger than that for PP wave. The azimuthal anisotropy is also more pronounced than the PP wave. The direction of the long axis of the ellipse fitted by the azimuth amplitude of the PS wave is perpendicular to the direction of the crack, while the long axis of the ellipse fitted by the direction of the amplitude of the PP wave is parallel to the direction of the crack. Similar to the PP wave, the elliptical azimuthal anisotropy is also observed in the layer-by-layer travel of the PS wave R component, with its long axis perpendicular to the fracture direction. The relationship between the azimuthal amplitude of PS wave R component and PP wave and the attribute of interlayer travel show the correlation with the crack density. When the range of the data offset is suitable, the ratio of the major axis to the minor axis of the fit ellipse can be used to characterize the crack The relative density.