裂缝参数对地震方位各向异性特征的影响

Effects of Fracture Parameters on Seismic Azimuthal Anisotropic Characteristics

通过数值模拟的方法研究由垂直裂缝诱导的HTI介质的各向异性特征,以及裂缝各发育参数与地震响应之间的关系。研究结果表明:对于HTI介质,裂缝介质的各向异性特征随裂缝密度增加而增强,且含饱和气裂缝介质的各向异性特征比含饱和水裂缝介质更显著;P波速度、反射系数随方位角会呈现椭圆、周期性变化,各向异性椭圆方位指示裂缝发育方向。

This article studies anisotropic characteristics of HTI medium by numerical simulation,including the relationship of fracture parameters and seismic responses.Results indicate that,for HTI media,the anisotropic characteristics increase with the crack density increases,and those in gas saturated medium change more significantly than in the water saturated one.P-wave velocity and reflection coefficient vary elliptically and periodically with azimuth.The elliptical azimuth indicates fracture orientation.All in all,these findings are of guiding significance for prediction and description of fractured reservoirs using actual P-wave data.