倾斜定向排列裂缝地层可以等效为 TI 介质，根据 TI 介质弹性波反射透射方程，模拟了上覆各向同性泰勒岩/下伏含有倾斜裂缝的奥斯汀白垩岩模型 qP 波方位反射系数。通过将qP 波方位反射系数拟合成椭圆，研究了裂缝密度、裂缝倾向、裂缝倾角与椭圆参数的关系。研究发现，随着裂缝密度增大椭圆扁率也在增大，裂缝倾向与椭圆中心点方位相差180°，裂缝倾角与椭圆中心点到坐标原点距离存在一定的对应关系。本研究可以为预测倾斜裂缝地层提供一定的理论支撑。%Tilt orientational fracture formation can be equivalent to TI medium.Therefore,according to the elastic wave reflec-tion and transmission equation of TI medium,we simulated qP wave azimuth reflectivity of isotropic Taylor rock overlying Aus-tin cretaceous rock with tilt fracture.By fitting qP wave azimuth reflectivity with ellipse,the relationship between fracture den-sity,fracture trend,fracture dip and elliptic parameter is studied in this paper.The study found that,with the fracture density increasing,ellipticity also increasing,and that there was a 180 degrees azimuth between fracture trend and ellipse center.And there was a certain correspondence between the distance from fracture dip and ellipse center to the origin of coordinates.Thus, this study could provide a theoretical support for predicting dipping fracture layers.
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