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

作　　者：FA Lin CASTAGNA John P ZENG ZhengWen BROWN Ray L ZHAO MeiShan 

机构地区：[1]School of Electronic Engineering, Xi'an University of Posts and Telecommunications, Xi'an 710061, China [2]Department of Earth and Atmospheric Sciences, University of Houston, Houston, TX 77204, USA [3]Department of Geology and Geological Engineering, University of North Dakota, Grand Forks, ND 58202, USA [4]Ray Brown Creative Interpretation Processing, Norman, OK 73071, USA [5]The James Franck Institute and Department of Chemistry, The University of Chicago, Chicago, IL 60637, USA

出　　处：《Chinese Science Bulletin》2010年第21期2243-2251,共9页

基　　金：supported by the National Natural Science Foundation of China(40974078);the US Department of Energy(DE-FC2608NT0 005643);the Natural Science Foundation of Shaanxi Province,China (2007D15);North Dakota Industrial Commission with five industrial companies:Encore Acquisition,Hess,Marathon Oil,St.Mary Land & Exploration,and Whiting Petroleum(NDIC-G015-031)

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.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.

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 

分 类 号：P631.4[天文地球—地质矿产勘探]