西藏尼木-那曲热水氘过量参数及其指示作用  

Characteristics and indicative significance of deuterium excess in thermal water in Nimu-Naqu area of Tibet,China

作　　者：刘昭[1] 蔺文静[1] 谢鄂军 何雨江[1] 张萌[3] 王贵玲[1] 

机构地区：[1]中国地质科学院水文地质环境地质研究所,石家庄050061 [2]西藏自治区地质矿产勘查开发局地热地质大队,拉萨850032 [3]中国地质大学环境学院,武汉430074

出　　处：《成都理工大学学报（自然科学版）》2014年第2期251-256,共6页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：中国地质调查项目(1212011220840);国家863计划项目(2012AA052802)

摘　　要：利用热水的氘过量参数,探讨其在地热田勘探开发中的指示作用.选取西藏尼木-那曲未开发利用的11个地热田,其中吉达果、宁中、谷露和玉寨为重点研究地热田,分别收集了2011年氢氧同位素数据,2012年对重点地热田进行氢氧稳定同位素数据采集,收集了进行过系统研究的羊八井热田的相关数据进行对比研究.研究区内天然水受到同位素交换作用的影响,氘过量参数（d值）分布在-20‰～30‰,主要集中在0‰～10‰;从d值箱式图中不难发现玉寨、谷露热田受同位素交换作用明显,在图中表现为异常点;探讨了d值随区域分布、海拔高度、取样温度、氚的关系;通过对天然水氢氧稳定同位素及d值进行Q聚类分析,很好地识别了区内天然水明显的同位素交换作用,概述了区内高温热储特征：d值较小、滞留时间较长、热水温度高、出现明显的氧漂移等.通过综合分析并结合当地实际情况,确定宁中-谷露区热田、玉寨热田为进一步研究的重点区域,结合当地实际情况及地热开发利用条件与潜力分析,谷露地热田区进行高温地热发电的前景较好.Based on the study of the deuterium excess （d-excess） parameterin thermal water,this paper investigates its indicative significance in the geothermal field exploration and development.11undeveloped and used geothermal fields in the Nimu-Naqu area of Tibet are chosen,taking Jidaguo,Ningzhong,Gulu and Yuzhai as primary geothermal fields to study.The hydrogen and oxygen isotopes data in 2011 and the hydrogen and oxygen stable isotopes data of the primarily studied geothermal fields in 2012 are collected,respectively.The related data of the systematic studied Yangbajing thermal field are also collected.Affected by the isotope-exchange function,the d-excess value ranged from-20‰ to 30‰,mainly from 0‰ to 10‰ for the natural water in study area.The thermal fields of Yuzhai and Gulu were significantly affected by the isotope-exchange function,manifesting exceptional points in the box-plot of d-excess.The paper researches the d-excess versus area,elevation,sample temperature and tritium.Finally,it makes Q-cluster analysis of the hydrogen and oxygen stable isotopes and d-excess,obviously distinguishes the isotope-exchange in nature water and outlines the characteristics of the high-temperature geothermal reservoir,that is,the lower d-excess value,the long residence time,the high temperature of thermal water,the apparent oxygen drift,etc..Through a comprehensive analysis and combined with the local actual situation,it determines the Ningzhong-Gulu and Yuzhai thermal fields as the key areas to further research.Combined with the local actual conditions and the geothermal exploitation conditions and the potential analysis,The paper considers that the prospect of the Gulu geothermal field is better for developing high temperature geothermal power.

关 键 词：热水 氘过量参数 箱式图 指示作用 

分 类 号：P641.3[天文地球—地质矿产勘探] P314.1[天文地球—地质学]