第43卷第6期 2016年12月
doi:10.12029/ge20160618
中
国地
质
GEOLOGYIN CHINA
李修成，马致远，张雪蓬，等.陕西省关中金地东大地热田成因机制分析[].中国地质，2016,43(6):2082-2091.
Vol.43, No.6 Dec.,2016
Li Xiucheng, Ma Zhiyuan, Zhang Xuelian, et al. Genetic model of the Dongda geothemal field in Guanzhong Basin, Shaanxi Province[]. Geology in China, 2016, 43(6): 20822091(in Chinese with English abstract)
陕西省关中盆地东大地热田成因机制分析
李修成马致远张雪莲郭森孟阳
党书生
（长安大学环境科学与工程学院，陕西西安710054）
提要：东大地热田是关中盆地地热资源较为丰富的地区之一，阐述其成因模式对于可持续开发利用热水资源具有定的指导意义。应用同位素水文地球化学方法，结合区域内地质构造条件，对地热田成因机制进行了系统研筑，结果表明该地热田属于申低温对流型地热系统。补给来源于西南部素岭山区大气降水，深层热水的补给高程下限为 1320m。地下热水经深循环在较大的大地热流背景值下被围岩加热，深层热储最高温度为110℃，热水最大循环深度为3120m，循环周期约为14461a。区域内地质构造复杂，处于多条不同方向活动断裂的交汇地带，为热水提供了良好的运移通道。热水在上涌的过程中会混有更多的当地冷水，由于上覆较厚第四系松散堆积物盖层，区域内形成地热异常。
键词：东大；地热田；同位素；水化学；成因机制；中低温对流型地热系统关
中图分类号：P314
文献标志码：A
文章编号：1000-3657(2016)06-2082-10
Geneticmodel of theDongda geothermalfieldin GuanzhongBasin,Shaanxi
Province
LI Xiu-cheng, MA Zhi-yuan, ZHANG Xue-lian,GUO Sen, MENG Yang, DANG Shu-sheng
(School of Emviroumental Sciences and Engineering, Chang an University, Xi'an 710054, Shaanxi China)
Abstract: Dongda is located in the south of Xi' an City, Shaanxi Province. The region is of alluvialpluvial plain and rich in geothermal resources. For the purpose of further exploration and sustainable use of geothemal resources, researchers should elaborate genetical mechanism of the geothermal field through the application of hydrogeochemical methods and analyzing regional geological conditions. The results obtained by the authors show that the geothermal field belongs to the low-medium temperature geothermal system of convective type. The regional heat flow is 74.5 mW/m’ without special additional heat source. The recharge area is located to the southwest of the geothermal field and geothermal water originates from precipitation of the Qinling Mountain esse cycling of 3120 m. The geothermal water age is about 14461 a. A number of different directions of active faults exist in the region Under the effect of thermal convection, geothermal water flows upward along the faults and is mixed with more cold water. Because
收稿日期：20151110；改回日期：20160110
基金项目：国家自然科学基金项目(41172211.41472221)资助。
作者简介：李修成，男，1990年生，额土生，主要从事地热、水文地质方面的研究；E-mail:799220222@qq.com。
http:/geochina.cgs.gov.cn 中国地质, 2016, 43(6)