各向异性介质界面模式转换波Ⅱ:仿真验证  

Interface mode converted wave in anisotropic media Ⅱ:Simulation

作　　者：法林 王家乐 赵琳 李玉霞 邹骁 胡凯利 李晓 张晓琳 法晓雪 赵梅山 FA Lin;WANG Jiale;ZHAO Lin;LI Yuxia;ZOU Xiao;HU Kaili;LI Xiao;ZHANG Xiaolin;FA Xiaoxue;ZHAO Meishan(School of Electronic Engineering,Xi’an University of Posts and Telecommunications,Xi’an 710121,China;School of Information Engineering,Xi’an Institute of Translation and Interpretation,Xi’an 710105,China;CNPC Logging Company Limited,Xi’an 710061,China;Juxian Development and Reform Bureau,Rizhao 276599,China;Associated Gas Comprehensive Utilization Project Department of Changqing Oilfield Company,Xi’an 710021,China;Department of Chemistry,James Franck Institute,University of Chicago,Chicago 60637,USA)

机构地区：[1]西安邮电大学电子工程学院,陕西西安710121 [2]西安翻译学院信息工程学院,陕西西安710105 [3]中国石油集团测井有限公司,陕西西安710061 [4]莒县发展和改革局,山东日照276599 [5]长庆石油分公司伴生气综合利用项目部,陕西西安710021 [6]芝加哥大学詹姆斯·弗兰克研究所化学系,伊利诺伊芝加哥60637

出　　处：《西安邮电大学学报》2022年第4期17-34,共18页Journal of Xi’an University of Posts and Telecommunications

基　　金：国家自然科学基金项目(41974130,40974078);中国石油天然气集团有限公司重大现场试验项目(2020F-46)。

摘　　要：在论文“各向异性介质界面模式转换波Ⅰ:理论分析”给出的VTI-TTI(Transverse Isotropy with a Vertical Axis of Symmetry-Transverse Isotropy with a Tilted Axis of Symmetry)介质界面上产生的模式转换波极化系数的解析表达式和该界面反射/折射系数的计算表达式的基础上,选择各向异性页岩-泰勒砂岩界面和各向异性页岩-油质页岩界面作为界面系统,利用MATLAB进行仿真,对各向异性介质界面反射和折射特性、产生的模式转换波的极化状态以及出现的一些物理现象进行了分析和解释。使用改进后的Daley-Hron各向异性介质界面模型,分析了地层各向异性和折射TTI介质倾斜角对界面第一临界角的影响。应用能量守恒定律和声学边界条件验证了推导出的在各向异性地层界面产生的模式转换波极化系数和该界面反射/折射系数的正确性。发现某些各向异性地层界面似乎存在一个对应折射SV(Shear Vertical)波的入射临界角(第二临界角),但是在实际中并不存在的物理现象。On the basis of the analytical expression of the polarization coefficient of the mode converted wave generated on the transverse isotropy with a vertical axis of symmetry-transverse isotropy with a tilted Axis of symmetry(VTI-TTI)medium interface,and the expression for calculating the reflection/refraction coefficient of the interface given in the paper"Interface mode converted wave in anisotropic media Ⅰ:Theoretical analysis",the anisotropic shale Taylor sandstone interface and the anisotropic shale oil shale interface are selected as the interface system,and MATLAB is adopted to simulate,analyze and explain the reflection and refraction characteristics of the anisotropic medium interface,the polarization state of the generated mode converted wave,as well as some physical phenomena.With an improved Daley-Hron anisotropy medium interface model,the effect of the formation anisotropy and the tilt angle of the refractive TTI medium on the first critical angle of the interface is analyzed.The validity of the derived mode conversion wave polarization coefficient generated at the anisotropic formation interface is verified by the energy conservation law and the acoustic boundary conditions.It is found that some anisotropic formation interfaces seem to have an incident critical angle(the second critical angle)corresponding to the refractive shear vertical(SV)wave,but they do not exist in practice.

关 键 词：慢度 各向异性地层界面 VTI-TTI介质 极化 反射/折射 

分 类 号：P313.1[天文地球—固体地球物理学]