三维地质建模中设定矿块尺寸探讨  

Discussion on block size setting in 3D geological modeling

作　　者：赵战锋[1] 周坤[1] 王玲[2] 

机构地区：[1]中国恩菲工程技术有限公司,北京100038 [2]北京矿冶研究总院,北京100160

出　　处：《有色金属（矿山部分）》2012年第4期83-86,共4页NONFERROUS METALS(Mining Section）

摘　　要：通过不同尺寸矿块建立某金矿地质模型,探索制约矿块尺寸的主要因素。模型分析结果显示,在矿床地质建模中,当矿块尺寸长轴小于20m时,金属量变化不大;当矿块尺寸长轴大于20m时,矿块在充填线框模型时不能很好地拟合边界,造成金属量计算存在过大误差,说明矿体形态是矿块尺寸主要的制约因素。矿块尺寸的大小必须与空间有效信息的构型和变程相适应,实验矿床不同尺寸矿块的三维地质模型显示,在一定尺度内随着矿块尺寸的减小,方差逐渐增大,说明矿块的尺寸越小,单个矿块的品位与真实品位的差距越大。因此,在地质建模过程中设定矿块尺寸需要考虑包括矿体形态、钻孔网度、变程和采矿方法等多种因素。The paper build the geological model through different size blocks, and explore the main factors restricting ore block size. In the geological model of experimental deposit, when the block size is smaller than 20 m, the curve of gold metal quantity is smooth. While when the block size is greater than 20m, the gold metal quantity has big error in the block, which can not fit the wireframe. The block size must also match the special efficient data and the range of semivariogram. In the geological model of gold deposit, as the block sizes decrease, the variances increase. In other words, as the block size decrease, the error of single block estimated grade gets bigger as well. In all, the bock size should keep within the bounds of shapes of ore bodies, exploratory grid, semivariogram range, and mining method.

关 键 词：矿块尺寸 方差 地质建模 

分 类 号：P624.7[天文地球—地质矿产勘探]