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《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:

第44卷

期数:

2022年第01期

页码:

124-131

栏目:

应用地球物理

出版日期:

2022-01-15

文章信息/Info

Title:

Geological Characteristics and Geophysical Exploration of Salt Lake-type Lithium Deposits in Qaidam Basin, China

文章编号:

1672-6561(2022)01-0124-08

作者:

孟军海¹; 林佳富¹; 才智杰¹; 薛国强²; 3; 4*; 周楠楠²; 3; 4; 李洪普⁵; 马 龙¹; 王丽君¹

(1. 青海省第三地质勘查院,青海 西宁 810000; 2. 中国科学院地质与地球物理研究所 中国科学院矿产资源研究重点实验室,北京 100029; 3. 中国科学院地球科学研究院,北京 100029; 4. 中国科学院大学 地球与行星科学学院,北京 100049; 5. 青海省柴达木盆地盐湖资源勘探研究重点实验室,青海 格尔木 816000)

Author(s):

MENG Jun-hai¹;  LIN Jia-fu¹;  CAI Zhi-jie¹;  XUE Guo-qiang²; 3; 4*;  ZHOU Nan-nan²; 3; 4;  LI Hong-pu⁵;  MA Long¹;  WANG Li-jun¹

(1. The Third Geological Exploration Institute of Qinghai Province, Xining 810000, Qinghai, China; 2. Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 3. Innovation Academy of Earth Science, Chinese Academy of Sciences, Beijing 100029, China; 4. College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China; 5. Qinghai Provincial Key Laboratory of Exploration and Research of Salt Lake Resources in Qaidam Basin, Golmud 816000, Qinghai, China)

关键词:

锂矿;  成矿地质模型;  地震;  电磁法;  背斜构造;  碱石山;  鄂博梁;  柴达木盆地

Keywords:

lithium deposit;  metallogenic geological model;  earthquake;  electromagnetic method;  anticline structure;  Jianshishan;  Eboliang;  Qaidam Basin

分类号:

P618.71; P631

DOI:

10.19814/j.jese.2021.08055

文献标志码:

A

摘要:

柴达木盆地新近系背斜构造中的深层卤水含有较为丰富的Li、B、K等有益元素。采用地质与地球物理相结合的手段研究区内背斜构造空间展布特征和盐类沉积特点,对于评价该类地区深层卤水锂资源潜力具有重要意义。从国内外锂资源分布现状、锂矿床类型及成矿地质模型选取碱石山、鄂博梁背斜构造有利成矿区,利用地震、广域电磁法等地球物理方法技术,在识别背斜构造形态、分析水层分布、总结构造裂隙发育特征的基础上,推断背斜构造深部卤水矿层产出层位、赋存特征、品位和厚度等,综合研究钻孔孔位布设,为开展该区锂资源潜力评价提供依据。钻探验证结果表明:地震方法探测深度大、分辨率高,对于地层分层及构造识别有较好的效果,但因含卤水地层与不含卤水地层的速度差异较小,地震方法难以识别; 广域电磁法具有较强的横向探测能力,尽管纵向分辨能力有限,但对于含卤水结构体的低电阻率特性反映灵敏。

Abstract:

The deep brine of Neogene anticline structure in Qaidam Basin is rich in beneficial components such as Li, B, and K. To study the anticline tectonic stratigraphy, structural characteristics, and salt deposition characteristics in the area, a combination of geology and geophysics is of great significance for evaluating the potential of lithium brine in the deep-seated brine in the anticline structure area. Starting with the distribution of lithium resources, types of lithium deposits and metallogenic geological models at home and abroad, the favorable ore forming areas of Jianshishan and Eboliang anticline structures were selected, and the geophysical methods and technologies such as earthquake and wide area electromagnetic method were used to infer the occurrence horizon of brine deposits in the deep part of anticline structures on the basis of identifying anticline structural morphology, analyzing water layer distribution and summarizing the development characteristics of structural fractures occurrence characteristics, grade and thickness, and comprehensively study the layout of borehole location, so as to provide basis for the evaluation of lithium resource potential in this area. The drilling verification results show that the seismic method has large detection depth and high resolution, and has a good effect on stratum stratification and structure identification, but the brine-bearing stratum is difficultly identified by seismic method, because the velocity difference between brine-bearing stratum and barren-brine stratum is little; wide area electromagnetic method has strong horizontal detection ability, and is sensitive to the low resistivity characteristics of brine-bearing structures, although the vertical resolution is limited.

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备注/Memo

备注/Memo:

收稿日期:2021-08-26; 修回日期:2022-01-03
基金项目:青地矿科[2021]16号; 青海学者专项项目(QHS201802); 青海省科技计划项目(2019-SF-141); 青海省海西蒙古族藏族自治州科技局科技支撑计划项目(2019-Q05)
作者简介:孟军海(1969-),男,河南郑州人,物探高级工程师,E-mail:435539647@qq.com。*通讯作者:薛国强(1966-),男,山西运城人,中国科学院地质与地球物理研究所研究员,博士研究生导师,理学博士,E-mail:ppxueguoqiang@163.com。

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