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常规的地震勘探都是建立在各向同性的介质模型假设之上的,但是实际地层普遍是各向异性的。在各向异性介质中,由于地震波的相速度和群速度之间的差异,使得地震响应变得复杂。本文根据HTI(具有水平对称轴的横向各向同性)介质中地震波的运动学特征,应用射线追踪方法,计算了介质中地震波的旅行时,并合成了反射P波地震记录,同时观测到P波旅行时、振幅等地震响应既随入射角变化又随方位角呈周期性变化,这为之后HTI介质方位特性分析提供了基础。研究结果表明:对于HTI介质,应用射线追踪方法进行地震正演收敛快,精度高,地震波运动学特征计算准确,值得推广。
Conventional seismic exploration is based on the assumption of isotropic medium models, but the actual formation is generally anisotropic. In anisotropic media, the seismic response is complicated by the difference between the phase velocity and the group velocity of the seismic waves. In this paper, based on the kinematic characteristics of seismic waves in HTI (horizontal isotropic with horizontal symmetry) media, ray tracing method is used to calculate the travel time of seismic waves in the media and to synthesize reflected P-wave seismograms and observe P waves When traveling, the seismic responses such as amplitude fluctuate with azimuth angle both with and without incident angles, which provides a basis for the later analysis of azimuth characteristics of HTI media. The research results show that for HTI media, ray tracing method is applied to seismic forward modeling with fast convergence, high accuracy and accurate calculation of seismic kinematics, which is worthy of promotion.