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    西藏谷露地热田地热地质特征

    高洪雷 胡志华 万汉平 郝伟林 张松 梁晓

    高洪雷, 胡志华, 万汉平, 郝伟林, 张松, 梁晓, 2023. 西藏谷露地热田地热地质特征. 地球科学, 48(3): 1014-1029. doi: 10.3799/dqkx.2022.150
    引用本文: 高洪雷, 胡志华, 万汉平, 郝伟林, 张松, 梁晓, 2023. 西藏谷露地热田地热地质特征. 地球科学, 48(3): 1014-1029. doi: 10.3799/dqkx.2022.150
    Gao Honglei, Hu Zhihua, Wan Hanping, Hao Weilin, Zhang Song, Liang Xiao, 2023. Characteristics of Geothermal Geology of the Gulu Geothermal Field in Tibet. Earth Science, 48(3): 1014-1029. doi: 10.3799/dqkx.2022.150
    Citation: Gao Honglei, Hu Zhihua, Wan Hanping, Hao Weilin, Zhang Song, Liang Xiao, 2023. Characteristics of Geothermal Geology of the Gulu Geothermal Field in Tibet. Earth Science, 48(3): 1014-1029. doi: 10.3799/dqkx.2022.150

    西藏谷露地热田地热地质特征

    doi: 10.3799/dqkx.2022.150
    基金项目: 

    中核集团集中研发项目 中核科发(2019)419号

    详细信息
      作者简介:

      高洪雷(1985-),男,工程师,主要从事构造地质与地热资源勘查工作. ORICD:0000-0002-1618-6044. E-mail:gaohonglei2050@126.com

    • 中图分类号: P548

    Characteristics of Geothermal Geology of the Gulu Geothermal Field in Tibet

    • 摘要: 西藏谷露地热田于2020年成功揭露到189.2 ℃的高温地热资源,研究谷露地热田地热地质特征,对西藏地热资源勘查开发和揭示高温地热系统成因机理都具有重要的科学与指导意义.本文以构造地质调查为基础,结合最新物探、钻探、水文资料,通过解析构造‒水‒热循环系统内在联系,总结构造控热规律,并建立了谷露地热田地热系统概念模型.谷露地热田内主要发育N-S向(F1、F3)、E-W向(F2、F4)和NE向3组断裂.大气降水与冰山融水沿盆地西侧九子拉‒桑雄断裂下渗,经深循环加热以盆地西缘F1断裂为导热通道向上运移,由于受到南北两侧F2、F4断裂的阻隔作用,热水在F1和F3断裂组成的“Y”字型断裂系统内汇聚集中,形成热储,并在地表沿NE向和N-S向断裂构成的通道系统中运移排泄;盆地基底花岗岩之上覆盖的泉胶砾岩层对热储起到了良好的隔水保温作用;热田内第四系沉积很薄,热储主要赋存于基岩裂隙中,为基岩裂隙型热储.F1与F3构成的“Y”字型断裂系统是热储赋存的主要场所,谷露地热田地热资源勘查开发要以这两条断裂为重点勘查目标.

       

    • 图  1  那曲‒尼木地热带大地构造(a)及地震、地热显示区分布(b)

      Fig.  1.  Tectonic of Naqu-Nimu geothermal belt (a) and distribution of earthquakes and geothermal field (b)

      图  2  谷露地热田遥感影像(a)与地质图(b)

      1.全新统沼泽沉积;2.中上更新统冲洪积层;3.中更新统冰水堆积层;4.马里组砂岩;5.花岗岩;6.泉华台地;7.逆冲断裂;8.活动断裂;9.隐伏断裂;10.构造裂隙;11.地热钻孔;12.测温孔;13.AMT剖面.遥感图像据google earth

      Fig.  2.  Remote sensing image (a) and geological map (b) of Gulu geothermal field

      图  3  谷露地热田E-W向断裂特征

      a. F2断裂地貌特征;b. F4断裂地貌特征;c. AMT剖面L1;位置见图 2a

      Fig.  3.  Characteristics of E-W trending faults in Gulu geothermal field

      图  4  谷露地热田N-S向断裂特征

      a. F1断裂错断中更新统冰水堆积层;b. F1断裂错断马里组砂岩;c. 断层面上斜向擦痕;d. 断层滑动矢量应力反演图;e. F3断裂地貌特征;f. 热水泉眼沿F3断裂线状出露;位置见图 2a

      Fig.  4.  Characteristics of N-S trending faults in Gulu geothermal field

      图  5  谷露地热田NE向断裂特征

      a. 肉红色花岗岩中共轭节理;b. 2号泉华台表面NE向裂隙,热水通道;c. 1号泉华台表面裂隙统计玫瑰花图;d. 2号泉华台表面裂隙统计玫瑰花图;e. 泉华台西侧NE向沟谷延伸通过泉华台地,位置见图 2a

      Fig.  5.  Characteristics of NE trending faults in Gulu geothermal field

      图  6  谷露地热田热水活动与泉华分布

      a.泉华台表面沸泉;b.桑曲西岸泉胶砾岩;c.桑曲河床底部红褐色泉胶砾岩;d.层状硅华;e.两级泉华台地地貌特征与地质剖面,位置见图 2a

      Fig.  6.  The distribution of hot water activity and sinter in Gulu geothermal field

      图  7  1号泉华台南北向构造剖面

      a. 泉华层理;b. 1号泉华台表面NE向断层,热水活动通道;c. 1号泉华台地地貌特征及构造剖面

      Fig.  7.  The north-south structural section of the No.1 sinter platform

      图  8  谷露地热田测温井钻孔柱状图

      位置见图 2b

      Fig.  8.  Histogram of boreholes of temperature measurement wells in Gulu geothermal field

      图  9  那曲‒尼木地热带典型高温地热系统概念模型(据刘昭,2014

      1.第四系;2.岩浆岩类;3.盖层;4.隔水岩层;5.热水储层;6.张性断裂;7.压性断裂;8.远程大气水;9.热水;10.温泉;11.中低温温泉;12.沸泉;13.冒气地面;14.推测温度等值线

      Fig.  9.  A typical conceptual model of high-temperature geothermal system in Naqu-Nimu geothermal belt(from Liu, 2014)

      图  10  谷露地热田地热系统概念模型(a)与ZK1001井放喷实验(b)

      Fig.  10.  Conceptual model of geothermal system of Gulu geothermal field(a)and blowout experiment of Well ZK1001(b)

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    出版历程
    • 收稿日期:  2022-04-16
    • 网络出版日期:  2023-03-27
    • 刊出日期:  2023-03-25

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