摘要
基于Thomsen岩石各向异性参数,计算了各向异性对在地下岩层中传播的弹性地震波的相速、能速和时-深转换的影响。结果表明:在关于垂直轴对称的横向各向同性介质非对称轴方向传播的P波的能速可以小于对称轴方向的相速,而在非对称轴方向传播的SV波的能速始终大于或等于对称轴方向的相速;如果不考虑各向异性或考虑各向异性但忽略在地层中传播的地震波的能速和相速之间的差别,会引起对地震波勘探信号的时-深转换产生误差,即不能用地震波勘探信号的走时信息准确地反演地下岩层的地质结构。
Thomsen's rock parameters are applied to calculate and analyze the effects of rock anisotropy on the phase velocity,energy velocity,and time-depth conversion of seismic exploration signals.The calculated results show that:the energy velocity of P wave propagating along the asymmetric-axis direction of transverse isotropy with a verticalaxis of symmetry media can be lower than the phase velocity in the symmetric-axis direction,while that of SV wave propagating along the asymmetric-axis direction is consistently greater than or equal to the phase velocity in symmetric-axis direction;If the rock anisotropy is ignorable or the difference between energy velocity and phase velocity is ignored when considering anisotropy,errors will be introduced in the timedepth conversion of seismic exploration signals,i.e.,the travel time of the seismic exploration signal cannot be precisely inverted to correspond with the geological structure of subsurface strata.
作者
法林
刘钊瑒
房向荣
巩红
李传伟
李晓
梁猛
赵梅山
FA Lin;LIU Zhaoyang;FANG Xiangrong;GONG Hong;LI Chuanwei;LI Xiao;LIANG Meng;ZHAO Meishan(Shool of Information Engineering,Xi'an Fanyi University Xi'an,710105,China;School of Electronic Engineering,Xi'an University of Posts and Telecommunications Xi'an,710121,China;Graduate School,Xi'an University of Posts and Telecommunications Xi'an,710121,China;Logging Institute,CNPC Logging Xi'an,710077,China;James Franck Institute,The University of Chicago Chicago,60637,USA)
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2024年第2期353-364,413,414,共14页
Journal of Vibration,Measurement & Diagnosis
基金
国家自然科学基金资助项目(41974130)
芝加哥大学物理科学部资助项目。
关键词
各向异性
相速
能速
时-深转换
anisotropy
phase velocity
energy velocity
time-depth conversion
