混合地质建模方法刻画复杂含铀砂层地质结构  

Coupling Geological Modeling for Complicated Sandstone-type Uranium Deposit

作　　者：苏学斌[1] 祝晓彬[2] 翁海成 张宇 刘正邦[1] 杨蕴[3] 原渊 周根茂[1] 吴吉春[2] 李宏星[1] 刘双民 SU Xuebin;ZHU Xiaobin;WENG Haicheng;ZHANG Yu;LIU Zhengbang;YANG Yun;YUAN Yuan;ZHOU Genmao;WU Jichun;LI Hongxing;LIU Shuangmin(Beijing Research Institute of Chemical Engineering and Metallurgy,CNNC,Beijing 101149,China;School of Earth Science and Engineering,Nanjing University,Nanjing 210093,China;School of Earth Science and Engineering,Hohai University,Nanjing 211100,China;CNNC Tongliao Uranium Industry Co.,Ltd.,Tongliao 028000,China)

机构地区：[1]核工业北京化工冶金研究院,北京101149 [2]南京大学地球科学与工程学院,江苏南京210093 [3]河海大学地球科学与工程学院,江苏南京211100 [4]中核通辽铀业有限责任公司,内蒙古通辽028000

出　　处：《安全与环境工程》2021年第3期212-219,227,共9页Safety and Environmental Engineering

基　　金：中国核工业集团有限公司核技术创新联合基金(U1967208);国家重点研发计划项目(2019YFC1804300)。

摘　　要：基于地质统计学原理的地层建模与岩性建模方法被广泛应用于三维地质建模中。对于矿区地质结构复杂、透镜体大量发育、矿层与围岩交互发育的地质结构,单纯使用地层建模方法很难划分地层层序,岩性建模方法难以刻画地层的连续性,且在局部缺乏钻孔资料时容易出现突变现象。提出一种地层/岩性混合的三维地质建模方法,该方法首先采用地层建模方法构建矿区层序清晰的标志地层,并确定地质模型标志层架构及分布范围;然后采用岩性建模方法构建具有复杂交互结构的含水层及含矿砂层;最后将地层建模和岩性建模部分通过模型拼接,最终构建砂岩型铀矿床的三维地质结构模型。以北方某大型砂岩型铀矿床含铀砂体及其围岩地质结构为例,依据提出的地层/岩性混合的三维地质建模方法,并采用EVS(Earth Volumetric Studio)软件完成了复杂的含铀砂层地质建模,并与岩性建模方法的结果进行对比分析,结果显示:地层/岩性混合的三维地质建模方法能够明显提高建模精度,可用于刻画含铀砂层非连续发育的砂岩型铀矿床的复杂地质结构。The stratigraphic modeling and the lithologic modeling based on Geostatistics are widely used in constructing 3 D geological structure.However,for the stratum in the mining area with complex geological structure,abundant lens development,and interaction between ore layer and surrounding rock lithology,it is difficult to depict the stratigraphic sequence by simply using the stratigraphic modeling,and it is also difficult to describe the continuity of the strata only based on the lithologic modeling,which is easy to produce saltation with a local lack of borehole data.In this paper,we propose a 3 D stratigraphic/lithologic coupling geological model.With this method,the stratigraphic modeling is firstly used to construct the symbolic stratum with sequence.Then the aquifer and ore-bearing bed with complex interactive structure are constructed by the lithologic modeling.The stratigraphic modeling is combined with the lithologic modeling to build the geological model of uranium deposit.This study applies the coupling geological modeling,which is implemented by EVS(Earth Volumetric Studio)modeling software,to the uranium sand body and its surrounding rock geological structure of a large sandstone-type uranium deposit in the North of China.The results of the geological structure model is compared with that of the lithologic model.The result shows that the stratigraphic/lithologic coupling geological modeling can obviously improve the modeling accuracy,thus it can be used to construct the structure of sandstone-type uranium deposit with the complex and discontinuous development of uranium bearing sand layer.

关 键 词：砂岩型铀矿床 地质结构 三维地质建模 地层建模 岩性建模 EVS 

分 类 号：X14[环境科学与工程—环境科学] P619.14[天文地球—矿床学]