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三维复杂介质的块状建模和试射射线追踪
引用本文:徐涛,徐果明,高尔根,朱良保,蒋先艺.三维复杂介质的块状建模和试射射线追踪[J].地球物理学报,2004,47(6):1118-1126.
作者姓名:徐涛  徐果明  高尔根  朱良保  蒋先艺
作者单位:1.中国科学技术大学地球和空间科学学院,合肥 230026 2中国石油集团东方地球物理公司研究院,涿州 072751
基金项目:国家自然科学基金资助 ( 4 0 3 740 10 )
摘    要:为了解决三维复杂介质的射线追踪,本文改变了传统的三维层状地层的建模描述方式,提出了块状结构的建模描述方法,结合三角形面片来描述地质界面,可以构造非常复杂的三维地质模型.为了满足射线追踪的需要,本文对模型界面内的法向量进行光滑处理,光滑后的法向量在界面内是连续变化的.在块状模型的基础上,本文运用三角形的面积坐标,提出了几种试射角度的修正方法:细分三角形法、分割三角形法和子三角形法,计算表明子三角形法最好.文中给出了三维块状模型和射线追踪实例.

关 键 词:射线追踪  块状建模  三角形面片  法向量  子三角形法  
文章编号:0001-5733(2004)06-1118-09
收稿时间:2003-9-19
修稿时间:2004-5-27

BLOCK MODELING AND SHOOTING RAY TRACING IN COMPLEX 3-D MEDIA
XU Tao.BLOCK MODELING AND SHOOTING RAY TRACING IN COMPLEX 3-D MEDIA[J].Chinese Journal of Geophysics,2004,47(6):1118-1126.
Authors:XU Tao
Institution:1.School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China 2 Geophysical Research Institute,Bureau of Geophysical Prospecting,CNPC,Zhuozhou 072751,China
Abstract:We propose block modeling to suit complex 3 D media.Instead of layers,geological media are regarded as an aggregate of geological blocks,which have their own attributes,such as shape,size,density and seismic wave velocity.The structure of blocky model is Body → Block → Interface → Point → Coordinate.We construct interfaces in the model with triangles,which fits most complex media.For normal vectors change abruptly across the linked boundaries,normal vectors of triangles are smoothed to suit ray tracing.We present some methods for shooting ray tracing in 3 D: triangle subdivision,triangle division and subtriangle methods.Our calculation indicates that the subtriangle method is most efficient.We present real cases for some complex models and ray tracing results on these models.
Keywords:Ray tracing  Block modeling  Triangle  Normal vector  Subtriangle method  
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