| 共和盆地恰卜恰地热区现今地热特征 |
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| 引用本文： | 张超,张盛生,李胜涛,贾小丰,姜光政,高堋,王一波,胡圣标.共和盆地恰卜恰地热区现今地热特征[J].地球物理学报,2018,61(11):4545-4557. |
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| 作者姓名： | 张超 张盛生 李胜涛 贾小丰 姜光政 高堋 王一波 胡圣标 |
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| 作者单位： | 1. 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室, 北京 100029;2. 中国科学院大学, 北京 100049;3. 中国科学院地球科学研究院, 北京 100029;4. 青海省水文地质工程地质环境地质调查院, 西宁 810008;5. 中国地质调查局水文地质环境地质调查中心, 河北保定 071051;6. 吉林大学环境与资源学院, 长春 130026 |
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| 基金项目： | 国家重大科技专项（2017ZX05008-004）资助. |
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| 摘 要： | 恰卜恰地热区位于青海共和盆地的东北部，是我国重要的具有干热岩地热资源勘探开发潜力的地区之一.自2013年起，不同的研究者针对该区开展了大量地球物理探测工作，然而现今地热场的研究相对较少.本文基于4口干热岩钻孔的稳态测温资料和81块岩芯样品的热导率测试数据，计算了研究区4个大地热流值.研究结果表明：研究区基底花岗岩层现今地温梯度为39.0~45.2℃·km-1，平均值为41.3℃·km-1，大地热流值介于93.3~111.0 mW·m-2之间，平均值为102.2 mW·m-2，与我国主要的克拉通型盆地（如柴达木盆地、四川盆地和鄂尔多斯盆地）和新生代裂谷型盆地（如渤海湾盆地）相比，该区属于青藏高原高热流背景下的局部异常高地温梯度和高大地热流区.分析认为，研究区高地热异常可能暗示共和盆地浅部（20 km以浅）存在局部异常热源体（岩浆囊）.
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| 关 键 词： | 稳态温度测量 地温梯度 热导率 大地热流 共和盆地 |
| 收稿时间： | 2017-12-06 |
Geothermal characteristics of the Qiabuqia geothermal area in the Gonghe basin,northeastern Tibetan Plateau |
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| ZHANG Chao,ZHANG ShengSheng,LI ShengTao,JIA XiaoFeng,JIANG GuangZheng,GAO Peng,WANG YiBo,HU ShengBiao.Geothermal characteristics of the Qiabuqia geothermal area in the Gonghe basin,northeastern Tibetan Plateau[J].Chinese Journal of Geophysics,2018,61(11):4545-4557. |
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| Authors: | ZHANG Chao ZHANG ShengSheng LI ShengTao JIA XiaoFeng JIANG GuangZheng GAO Peng WANG YiBo HU ShengBiao |
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| Abstract: | Located in the northeastern Gonghe basin, the Qiabuqia geothermal area is one of the most important areas with exploration and development potential of Hot Dry Rock (HDR) geothermal resources in China. Although large quantities of geophysical exploration work have been made since 2013, the study of the present-day geothermal field remains scarce. Based on the steady-state temperature data of four HDR boreholes and thermal conductivities from 81 core samples, four terrestrial heat-flow values are calculated in this study. It turns out that the temperature gradients of basal granite vary from 39.0~45.2 ℃·km-1 with an average value of 41.3 ℃·km-1, and the terrestrial heat flow ranges from 93.3~111.0 mW·m-2, with a mean of 102.2 mW·m-2. Compared to the main craton basins (such as the Qaidam basin, Sichuan basin and Ordos basin) and Cenozoic rift basins (such as the Bohai Bay basin) in Chinese mainland, the study area appears to be a local thermal anomalous area with high temperature gradients and high heat flow under the relatively high regional background of heat flow in the Tibetan plateau. Such a high thermal anomaly may suggest the existence of a possible hot source body (magma chamber) at a shallow depth (no greater than 20 km) beneath the Gonghe basin. |
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| Keywords: | Steady-state temperature logging Geothermal gradients Thermal conductivity Terrestrial heat flow Gonghe basin |
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