摘要
察尔汗盐湖地下晶间卤水蕴藏了宝贵的盐湖矿产资源,如何确定地下卤水的赋存规律以制定科学合理的卤水开采和补给方案,正成为盐湖资源大规模可持续利用亟需解决的重要问题。以察尔汗盐湖西北部的典型采卤区作为研究区域,1)利用新型的地面核磁共振找水仪,通过在研究区布设两条十字交叉的测线,探测并反演解译测区地下60m深度内的卤水静态赋存形式,2)结合OpenGeoSys(OGS)多物理场耦合地下水数值模拟软件,对测区地下卤水的动态运移形式进行数值模拟计算。地面核磁探测结果表明,研究区含水量整体偏低,最大含水量约0.8%,平均含水量约0.4%。测点结果给出的含水层位分界面与邻近钻孔的地层层位分界面的一致性较高,浅部的层位误差在10%以下,达到了0.5 m的精度。考虑到测区南北两边均有采卤渠正在汲取地下卤水,且在测区中心存在两条废弃的采卤渠,OGS地下水数值模拟结果表明,采卤渠造成测区浅部卤水较大空缺,与研究区浅部含水量总体偏低的探测特征一致。地面核磁共振技术能准确探测卤水当前的赋存状态,地下水运移模拟技术可以深入认识采补活动引起卤水赋存状态的变化规律。探测和模拟结合是确定卤水赋存规律的重要手段,研究成果可为盐湖资源合理开采、高效利用提供基础资料和技术支撑。
Valuable mineral resources are reserved in the underground intercrystalline brine of Qarhan Salt Lake.It is essentially important to determine the occurrence state and spatial distribution characteristics of underground brine,in order to scientifically and rationally developing schemes in exploiting underground salt mineral resources and recharging groundwater in large-scale salt lake resources development.In this paper,the authors studied the typical mining area in the northwestern Qarhan Salt Lake by using the newest version of GMR(Ground nuclear Magnetic Resonance).The space distribution of brine in the depth of 60 m is obtained by inverting the detected observations by setting two cross profile lines with a total of 20 measuring points in the study area.At the same time,the authors use the OGS(OpenGeoSys)multi-physical field coupling software to numerically simulate underground brine dynamic migration process in the study area.The result of GMR exploration shows that the water content in this area is relatively low,the maximum water content is about 0.8%,and the average water content is about 0.4%.The result of the measuring points about the aquifer potential interface is consistent with that of the adjacent borehole,and the mismatch of depths of each shallow horizon interfaces is less than 10%,reaching the accuracy of 0.5 m.Considering the two pumping brine channels in the north and south edge and the two abandoned brine channels in the central of the study area,the result of OGS groundwater numerical simulation shows that brine channel could cause vacancies of underground brine,verified by low water content in the study area.The combination results show that the surface nuclear magnetic resonance detection technology can accurately determine the spatial distribution of brine in the detection time,and the groundwater migration simulation technology can help deeply understand the relationship between migration and replenishment and discharge of underground brine in mining area.Jointly research of brine detection and migration is significant to study the regular pattern of brine occurrence in pumping and erplenishing process.This research can provide scientific support for rationally explorating salt lake resources.
作者
张光武
易磊
高泽永
韩凤清
陈富洪
马喆
卢晓航
刘小宝
韩光
袁文虎
刘溪溪
ZHANG Guang-wu;YI Lei;GAO Ze-yong;HAN Feng-qing;CHEN Fu-hong;MA Zhe;LU Xiao-hang;LIU Xiao-bao;HAN Guang;YUAN Wen-hu;LIU Xi-xi(Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining,810008,China;Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes,Xining,810008,China;University of Chinese Academy of Sciences,Beijing,10049,China;State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou,730000,China;Qaidam Integrated Geological Exploration Institute of Qinghai Province,Golmud,816000,China)
出处
《盐湖研究》
CAS
CSCD
2021年第1期56-68,共13页
Journal of Salt Lake Research
基金
青海省柴达木盆地卤水钾矿可采储量研究项目
第二次青藏高原综合科学考察研究(2019QZKK0805)
中科院西部青年学者B类项目
中科院博士后项目。
