|
|||||
|
|
| 江西宁都县北部大地热流特征及地热资源成因机制 | |
| 引用本文： | 刘峰, 王贵玲, 张薇, 岳晨, 甘浩男, 肖则佑, 欧小科. 江西宁都县北部大地热流特征及地热资源成因机制[J]. 地质通报, 2020, 39(12): 1883-1890. |
| 作者姓名： | 刘峰 王贵玲 张薇 岳晨 甘浩男 肖则佑 欧小科 |
| 作者单位： | 1.中国地质科学院水文地质环境地质研究所, 河北 石家庄 050061; 2.中国地质大学(北京), 北京 100083; 3.自然资源部地热与干热岩勘查开发技术创新中心, 河北 石家庄 050061; 4.江西省地质矿产勘查开发局赣南地质调查大队, 江西 赣州 341000; 5.深圳市市政设计研究院有限公司, 广东 深圳 518000 |
| 基金项目： | 中国地质调查局项目《全国大地热流值测量与靶区优选》(编号:DD20190128) |
| 摘 要： |  江西省宁都县北部地区地热资源丰富，但地热地质研究程度较低，制约着区域地热资源的研究与可持续发展。在前人研究基础上，依托中国地质调查工作，对研究区大地热流特征及地热成因机制进行分析。基于钻孔测温与热导率测试数据，分析校正得到区域内大地热流平均值为93.6 mW/m2，远高于中国陆区平均值62.5 mW/m2，区域热背景值较高。  通过放射性测试可知本区大面积出露的花岗岩与混合岩放射性生热率平均值为6.47 μW/m3，属高放射性岩体，岩石的放射性衰变产热应是本区大地热流值较高的重要原因，幔源供热的基础上附加壳源产热，提供了稳定的热源。在此基础上，穿越本区的2条深大断裂及其次生断裂则为地下热水深循环提供了传热与导水通道。因此推测，研究区地热资源成因机制为"高热流与高产热花岗岩体生热+多级次断裂控热导水"的成因模式，该模式代表性较强，可为赣南地区地热找矿提供指导。  |
| 关 键 词： | 赣南地区 大地热流 高产热花岗岩 地热成因模式 |
| 收稿时间： | 2020-07-10 |
| 修稿时间： | 2020-09-21 |
Terrestrial heat flow and geothermal genesis mechanism of geothermal resources in northern Ningdu County,Jiangxi Province |
|
| LIU Feng, WANG Guiling, ZHANG Wei, YUE Chen, GAN Haonan, XIAO Zeyou, OU Xiaoke. Terrestrial heat flow and geothermal genesis mechanism of geothermal resources in northern Ningdu County, Jiangxi Province[J]. Geological Bulletin of China, 2020, 39(12): 1883-1890. | |
| Authors: | LIU Feng WANG Guiling ZHANG Wei YUE Chen GAN Haonan XIAO Zeyou OU Xiaoke |
| Affiliation: | 1.Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, Hebei, China; 2.China University of Geosciences(Beijing), Beijing 100083, China; 3.Technological Innovation Center of Geothermal&Hot Dry Rock Exploration and Development, MNR, Shijiazhuang 050061, Hebei, China; 4.South Jiangxi Geological SurveyingParty, Jiangxi Bureau of Exploration and Development of Geology and Minerals, Ganzhou 341000, Jiangxi, China; 5.Shenzhen Municipal Design and Research Institute Co., Ltd., Shenzhen 518000, Guangdong, China |
| Abstract: | The northern area of Ningdu Country is rich in geothermal resources; nevertheless, the blank research on terrestrial heat flow and geothermal mineralization background restricts the exploitation and utilization of geothermal resources seriously.Based on previous research and geological survey, the authors analyzed the terrestrial heat flow and geothermal genesis mechanism of the study area.The conclusions are as follows:firstly, based on well temperature measurement and thermal conductivity data, the authors detected that the average terrestrial heat flow is 93.6 mW/m2 in this region, which is far higher than the average terrestrial heat flow 62.5 mW/m2 in China's continental regions.This area has a relatively strong strength of geothermal background.Secondly, the average radiation heat generation rate of the exposed granite and migmatite in this area is 6. 47 W/m3, suggesting a highly radioactive rock mass.The radioactive decay heat generation of the rock is an important reason for high terrestrial heat flow in this area.Besides heating from mantle source, shell source heat generation is added to provide a stable heat source.On the other hand, two deep faults and their secondary faults across this region has provided heat transfer and water flowing channels for deep circulation of hot groundwater.Therefore, it is inferred that the formation mechanism of geothermal resources in the research area could be described as the "high heat flow background + rocks with high heat production +multi-level thermal control and water conducted faults ".This study provides guidance for geothermal prospecting in Gannan area. |
| Keywords: | Gannan area terrestrial heat flows high-yielding thermal granite geothermal genesis model |
| 点击此处可从《地质通报》浏览原始摘要信息 | |
| 点击此处可从《地质通报》下载全文 | |