论文部分内容阅读
本文提出一种利用有偏ＶＳＰ资料反射波旅行时信息重建椭圆各向异性介质中水平向与垂直向速度的方法。其中，地下介质假定为层状椭圆各向异性介质。反射波旅行时间采用射线追踪理论及几何关系计算得到，反演中的线性方程组采用奇异值分解（ＳＶＤ） 技术进行求解。 方法检测时，我们对各向同性介质及椭圆各向异性介质情况下有限差分法正演模拟的深井有偏移距ＶＳＰ地震资料分别进行各向阿胜和各向异性方法反演成像。结果表明，本文所述方法较之各向同性介质模型反演方法对介质类型有很好的适用性，同时也说明了本方法的可行性。最后，我们分别介绍了对实际有偏ＶＳＰ资料反演得到的地下介质的速度结构图像。
In this paper, we propose a method to reconstruct the horizontal and vertical velocities in elliptical anisotropic media by using the VSP traveling wave data. Among them, the underground medium is assumed to be a layered elliptical anisotropic medium. Reflected wave traveling time is calculated by using ray tracing theory and geometric relationship. The linear equations in inversion are solved by SVD (Singular Value Decomposition) technique. In the method of detection, we use the seismic data of deep well offset VSP developed by Finite Difference Method in anisotropic media and elliptical anisotropic media to perform the inversion and anisotropic anisotropy imaging respectively. The results show that the proposed method is better than the inversion method of isotropic medium model for media types and the feasibility of this method. Finally, we present separately the velocity structure images of the subterranean media retrieved from the actual biased VSP data.