Effects of anisotropy on time-depth relation in transversely isotropic medium with a vertical axis of symmetry

• 来源期刊: 科学通报(英文版)
• 学科: 地球科学
• 关键词: 介质各向异性 横观各向同性 地震反射数据 对称轴 各向异性参数 速度分析 垂直 作者
• 年，卷（期）: 2010,（21）
• 所属期刊栏目: ARTICLES
• 页码范围: 2243-2251
• 页数: 9页
• 分类号: P313.2 TN011
• 语种: 英文

摘要

It is known that rock anisotropy can significantly influence the phase and energy velocities of an elastic wave,as well as its reflection/transmission(R/T)coefficients.As a result,it can distort the velocity analysis of seismic-reflection data.In this work we present a velocity analysis for seismic-reflection data based on the available anisotropic rock parameters.We analyzed the created errors on time-depth relation of the seismic-reflection data in neglecting rock anisotropy and/or neglecting the difference between energy velocity and phase velocity,including the case of wide-angle reflection.The calculated results show that the effect of rock anisotropy on time-depth relation of seismic-reflection data is dependent not only on the values of anisotropic parameters,but also on the space arrangement of both source and receiver-array.For all studied cases(weak,moderate or strong anisotropy),we found that the effect of rock anisotropy on time-depth relation could not be neglected.Nevertheless,for the case of weak anisotropy,the energy velocity may be replaceable by the phase velocity to obtain a very good approximation on time-depth relation.Consequently,the seismic-reflection data processing algorithm for numerical computations can be simplified.