The Method and Practice of Constructing 3D Geological Model from Coalfield Exploration 2D Maps  

作　　者：Hui Su Qingyuan Li Duohu Hao Ke Xiong Wei Hu Xinyong Wei Xuan Zhang Hui Su;Qingyuan Li;Duohu Hao;Ke Xiong;Wei Hu;Xinyong Wei;Xuan Zhang(School of Geosciences and Surveying Engineering, CUMTB (China University of Mining & Technology), Beijing, China;Chinese Academy of Surveying and Mapping, Beijing, China;173 Exploration Team, CNACG (China National Administration of Coal Geology), Zhuozhou, China;Changtu Technology Co., Ltd., Beijing, China)

机构地区：[1]School of Geosciences and Surveying Engineering, CUMTB (China University of Mining & Technology), Beijing, China [2]Chinese Academy of Surveying and Mapping, Beijing, China [3]173 Exploration Team, CNACG (China National Administration of Coal Geology), Zhuozhou, China [4]Changtu Technology Co., Ltd., Beijing, China

出　　处：《International Journal of Geosciences》2023年第7期635-654,共20页地球科学国际期刊（英文）

摘　　要：3D geological modeling is an inevitable choice for coal exploration to adapt to the transformation of coal mining for green, fine, transparent and Intelligent mining. In the traditional Coalfield exploration geological reports, the spatial expression form for the coal seams and their surrounding rocks are 2D maps. These 2D maps are excellent data sources for constructing 3D geological models of coal field exploration areas. How to construct 3D models from these 2D maps has been studying in coal exploration industry for a long time, and still no breakthrough has been achieved so far. This paper discusses the principle, method and software design idea of constructing 3D geological model of an exploration area with 2D maps made by AutoCAD/MapGIS. At first, the paper analyzes 3D geological surface expression mode in 3D geological modeling software. It is pointed out that although contour method has unique advantages in coal field exploration, TIN (Triangular Irregular Network) is still the standard configuration of 3D modeling software for coal field. Then, the paper discusses the method of 2D line features obtaining elevation and upgrading 2D curve to 3D curve. Next, the method of semi-automatic partition is introduced to build the boundary ring of the surface patch, that is, the user clicks and selects the line feature to build the outer boundary ring of the surface patch. Then, Auto-process method for fault line inside of the outer boundary ring is discussed, it including construction of fault ring, determining fault ring being normal fault ring or reverse fault ring and an algorithm of dealing with normal fault ring. An algorithm of dealing with reverse fault ring is discussed detailly, the method of expanding reverse fault ring and dividing the duplicate area in reverse fault into two portions is introduced. The paper also discusses the method of extraction ridge line/valley line, the construction of fault plane, the construction of stratum and coal body. The above ideas and methods have been initially implement3D geological modeling is an inevitable choice for coal exploration to adapt to the transformation of coal mining for green, fine, transparent and Intelligent mining. In the traditional Coalfield exploration geological reports, the spatial expression form for the coal seams and their surrounding rocks are 2D maps. These 2D maps are excellent data sources for constructing 3D geological models of coal field exploration areas. How to construct 3D models from these 2D maps has been studying in coal exploration industry for a long time, and still no breakthrough has been achieved so far. This paper discusses the principle, method and software design idea of constructing 3D geological model of an exploration area with 2D maps made by AutoCAD/MapGIS. At first, the paper analyzes 3D geological surface expression mode in 3D geological modeling software. It is pointed out that although contour method has unique advantages in coal field exploration, TIN (Triangular Irregular Network) is still the standard configuration of 3D modeling software for coal field. Then, the paper discusses the method of 2D line features obtaining elevation and upgrading 2D curve to 3D curve. Next, the method of semi-automatic partition is introduced to build the boundary ring of the surface patch, that is, the user clicks and selects the line feature to build the outer boundary ring of the surface patch. Then, Auto-process method for fault line inside of the outer boundary ring is discussed, it including construction of fault ring, determining fault ring being normal fault ring or reverse fault ring and an algorithm of dealing with normal fault ring. An algorithm of dealing with reverse fault ring is discussed detailly, the method of expanding reverse fault ring and dividing the duplicate area in reverse fault into two portions is introduced. The paper also discusses the method of extraction ridge line/valley line, the construction of fault plane, the construction of stratum and coal body. The above ideas and methods have been initially implement

关 键 词：Coalfield Exploration 3D Geological Modeling Semi-Automatic Partition Partition Triangulation Reverse Fault Duplicate Area Triangulation 

分 类 号：P61[天文地球—矿床学]