各向异性矿化特征的分析与模拟及其在储量估算中的应用  

3D Geological Modeling of Anisotropic Mineralization and Its Application in Reserves Estimation

作　　者：金毅[1,2] 郑德顺[1] 潘懋[2] 张璐[1] 

机构地区：[1]河南理工大学资源与环境学院,河南焦作454000 [2]北京大学造山带与地壳演化教育部重点实验室,北京100871

出　　处：《地质学报》2011年第9期1519-1527,共9页Acta Geologica Sinica

基　　金：国家自然科学基金项目(编号41102093;40902033);河南省生物遗迹与成矿过程重点实验室开放基金项目(编号OTMP0802)联合资助的成果

摘　　要：矿化作用往往是地质事件及局部过程共同作用的结果,导致矿体空间形态复杂多变、矿石品位呈各向异性、尺度不一的非线性空间变异模式。传统方法无论是在矿石量的计算方面还是在矿块内平均品位的确定上都存在多种误差,并且无法实现信息的动态管理及直观表达。文章以安庆铜矿中心矿区为例,采用对数块kriging与三维地学模拟技术相结合的方法实现了储量的准确估算与动态管理。根据样品数据的空间构形引入虚拟钻孔,通过层位标定算法实现了矿体形态的近似模拟;以形态模型为约束,采用对数块kriging方法,在矿石品位变异特征分析结果的基础上,构建了品位三维属性模型,进而完成资源储量的准确计算。通过对不同方法估算结果的对比分析表明,对数块kriging方法相对于普通kriging方法及传统块段法而言具有明显的优势,并且随子块数量的增加精度呈增大趋势,但很快趋向稳定。文章最后利用可视化技术展示了三维地学模拟技术在矿山生产和开发过程中动态更新及决策支持的能力。Mineralization is often considered as an integrated result of geological events and local processes,both of which produce the nonlinear space variation mode displaying morpholoigcal complexity,varied grades,and sizes of orebodies.Conventional methods of resource estimation have deviation on both calculation of ore reserves and average grade of ores,and fail to realize instant management and visualization for real-time data.Taking the central ore zone of Anqing copper deposit as an example,this study realized the precise estimation and real-time management for ore reserves using lognomal block Kriging method and 3D geological modeling.Based on spatial configuration of the samples,virtual boreholes were introduced to approximately simulate orebody shapes using stratum tagging algorithm.With restriction of morphological model in association with the variant features of ore grades,the lognomal block Kriging method was employed to build 3D property model of grade so as to improve precise assessment of ore reserves.Comparative analyses for the reserves data evaluated by different methods show that,relative to the common Kriging method and conventional block method,the lognomal block Kriging method has obvious advantages and its precision inceases with increasing number of sub-blocks but tends to stable soon.At last,the study took use of visuliaztion technology to display ability of the 3-D geological modeling technology in instant updating and decision making during mine production and development.

关 键 词：三维地学模拟 块kriging方法 固体矿产资源 地质属性模拟 矿体形态模拟 

分 类 号：P624.7[天文地球—地质矿产勘探]