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在倾斜页岩中,地震各向异性引起下覆构造成像和定位问题。我们为相对层面法向具有倾斜对称轴的横向各向同性介质(TI)P波地震数据开发出一种各向异性深度偏移方法。对深度成像速度模型输入各向异性和倾角参数,并用叠前深度偏移成像道验证拾取的各向异性速度模型。倾斜各向异性覆盖层以下的构造在各向同性和各向异性偏移中位置发生了显著变化。通过对TI介质倾斜对称轴旅行时的计算,2D叠前基尔霍夫深度偏移射线追踪法得到修正。各向异性深度偏移算法应用于物理模型和加拿大落基山逆断层及褶趋带的野外地震数据中,极大地改善了各向同性算法得到的地震数据定位和反射层连续性
In sloping shales, seismic anisotropy causes imaging and positioning problems of substructure. We developed an anisotropic depth migration method for relative-layer normalized P wave seismic data with transversely isotropic media (TI). Anisotropy and dip parameters are entered into the depth imaging velocity model and the picked anisotropic velocity model is validated using pre-stack depth migration imaging. The structure below the inclined anisotropic cover changes dramatically in isotropic and anisotropic displacements. The 2D pre-stack Kirchhoff depth-shift ray tracing method was modified by the calculation of the TI media tilt-axis travel. The anisotropic depth migration algorithm is applied to the field model of the physical model and to the field seismic data of the Canadian Rockies reverse faults and fold trending, which greatly improves the seismic data localization and reflector continuity obtained by the isotropic algorithm