基于线框单元体的三维闭合地质块体构建方法
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摘要
为能充分利用空间数据模型中的拓扑关系来实现三维闭合块体的构建,引入了表示简单块体轮廓的线框单元体概念来组织三维模型间各要素之间的拓扑关系;并以此为基础给出了以方向边和方向三角形作为基本识别单元进行三维简单形体的自动识别方法。应用实例表明:利用该方法不仅可以准确构建复杂地质块体,还可以准确描述块体内各要素的拓扑关系,再现局部特殊地质现象,如小断层(悬面)等。为三维地质模型在地震正演模拟、射线追踪等分析应用方面提供了基础。
To construct 3D geological blocks with the topology of spatial data model,the notion of wire frame component describing the outline of simple block is presented to organize the topology of elements in the 3D geological model.With the help of the notion,an automatic block identification approach is proposed,in which the directed edge and directed triangle are used as basic search unit.The simulation result illustrated that the approach presented not only can model complex blocks,but also can exactly represent the topology among the elements in the block and local geological phenomena such as small fault (free face).The method provides base of the application of 3D geology model to seismic forward modeling,ray tracing,etc.
To construct 3D geological blocks with the topology of spatial data model,the notion of wire frame component describing the outline of simple block is presented to organize the topology of elements in the 3D geological model.With the help of the notion,an automatic block identification approach is proposed,in which the directed edge and directed triangle are used as basic search unit.The simulation result illustrated that the approach presented not only can model complex blocks,but also can exactly represent the topology among the elements in the block and local geological phenomena such as small fault (free face).The method provides base of the application of 3D geology model to seismic forward modeling,ray tracing,etc.
引文
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[2]Heliot D.Generating a blocky rock mass[J].Int J RockMech Min Sci and Geomech Abstr,1988,25(3):127-138.
[3]Lin D,Fairhurst C,Starfield A M.Geometrical iden-tification of three dimensional rock block system usingtopological techniques[J].Int J Rock&Geomech Ab-str,1987,24(6):331-338.
[4]Jing L,Stephansson O.Topological identification ofblocky assemblages for jointed rock masses[J].Int JRock Mech&Geomech Abstr,1994,31(2):163-172.
[5]Jing L.Block system construction for three-dimension-al discrete element models of fractured rocks[J].Int JRock Mech&Geomech Abstr,2000,37(4):645-659.
[6]Lu J.Systematic identification of polyhedral rockblocks with arbitrary joints and faults[J].Computersand Geotechnics,2002,29(1):49-72.
[7]蒋先艺,贺振华,黄德济.封闭结构模型建立方法[J].石油地球物理勘探,2002,37(4):339-342.JIANG Xian-yi,HE Zhen-hua,HUANG De-ji.Amethod for building a model in closed structure[J].OilGeophysical Prospecting,2002,37(4):339-342.
[8]孟宪海,杨钦,李吉刚.基于层面结构的三维闭合地质区块构造算法[J].北京航空航天大学学报,2005,31(2):182-186.MENG Xian-hai,YANG Qin,LI Ji-gang.Construc-tion of coherent 3D geological blocks from stratifiedgeological structure[J].Journal of Beijing Universityof Aeronautics and Astronautic,2005,31(2):182-186.
[9]Berlioux A.Depth migration of complex surface withGOCAD:Study of the curvature of a triangulated sur-face[J].Stanford Exploration Project,2001,82:1-115.
[10]郑坤,刘修国,吴信才,等.顾及拓扑面向实体的三维矢量数据模型[J].吉林大学学报(地球科学版),2006,36(3):474-479.ZHENG Kun,LIU Xiu-guo,WU Xin-cai,et al.Atopology-concerned and entity-oriented 3D vector datamodel[J].Journal of Jilin University(Earth ScienceEdition),2006,36(3):474-479.
[11]HOU Wei-sheng,WU Xin-cai,LIU Xiu-Guo,et al.An approach to construct sealed 3D geological modelwith seismic interpretation data[C]//Wang Jia-ying,et al.Geophysical solutions for environmental and en-gineering.Beijing:Science Press,2006:1063-1067.
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