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青海共和盆地干热岩赋存地质特征及开发潜力

张盛生 张磊 田成成 蔡敬寿 唐保春

张盛生, 张磊, 田成成, 等, 2019. 青海共和盆地干热岩赋存地质特征及开发潜力. 地质力学学报, 25 (4): 501-508. DOI: 10.12090/j.issn.1006-6616.2019.25.04.048
引用本文: 张盛生, 张磊, 田成成, 等, 2019. 青海共和盆地干热岩赋存地质特征及开发潜力. 地质力学学报, 25 (4): 501-508. DOI: 10.12090/j.issn.1006-6616.2019.25.04.048
ZHANG Shengsheng, ZHANG Lei, TIAN Chengcheng, et al., 2019. OCCURRENCE GEOLOGICAL CHARACTERISTICS AND DEVELOPMENT POTENTIAL OF HOT DRY ROCKS IN QINGHAI GONGHE BASIN. Journal of Geomechanics, 25 (4): 501-508. DOI: 10.12090/j.issn.1006-6616.2019.25.04.048
Citation: ZHANG Shengsheng, ZHANG Lei, TIAN Chengcheng, et al., 2019. OCCURRENCE GEOLOGICAL CHARACTERISTICS AND DEVELOPMENT POTENTIAL OF HOT DRY ROCKS IN QINGHAI GONGHE BASIN. Journal of Geomechanics, 25 (4): 501-508. DOI: 10.12090/j.issn.1006-6616.2019.25.04.048

青海共和盆地干热岩赋存地质特征及开发潜力

doi: 10.12090/j.issn.1006-6616.2019.25.04.048
基金项目: 

青海省重点研发计划 2018-SF-109

详细信息
    作者简介:

    张盛生(1983-), 男, 工程师, 从事水文地质、环境地质方面的调查研究工作。E-mail:398630278@qq.com

  • 中图分类号: P314

OCCURRENCE GEOLOGICAL CHARACTERISTICS AND DEVELOPMENT POTENTIAL OF HOT DRY ROCKS IN QINGHAI GONGHE BASIN

  • 摘要: 青海共和盆地贮藏有丰富的干热岩地热资源。为提升共和盆地干热岩地热资源成因的理论认识,进一步推动干热岩资源的勘探,文章从共和盆地干热岩热源机制、盖层条件、储层特征等方面对共和盆地干热岩资源成因件进行了全面分析。首先,结合区域地质构造分析、地热地质调查、地球物理(航磁、地震)解译等手段,在共和盆地恰卜恰岩体内实施了4口深度为2927~3705 m的干热岩勘查孔,并在3705 m处钻获236℃的优质干热岩资源,为中国非现代火山区干热岩地热资源勘探的首个重大突破。其次,系统测试了钻孔不同深度花岗岩放射性,结果表明,共和盆地花岗岩体铀、钍、钾放射性含量略高于大地背景值,放射性生热率较低,对干热岩热源的贡献小,其热源可能来自壳内熔融体。第三,基于地质资料分析和航磁解译,圈定了共和盆地总体面积约1.4×104 km2的潜在干热岩分布区。最后,采用体积法评估了共和盆地干热岩资源潜力,结果表明,共和盆地3.0~6.0 km深度范围保守的、静态干热岩资源总量为8974.74×1018 J,换算标准煤可达3066.19×108 t,具有广阔的开发利用前景。

     

  • 图  1  研究区位置及区域地质构造简图

    Figure  1.  The brief map of the location and regional geological structure of the research area

    图  2  共和盆地及周边航磁异常分布图

    Figure  2.  The magnetic anomaly distribution map of the Gonghe Basin and surrounding area

    图  3  恰卜恰岩芯样品热导率随深度分布关系图

    Figure  3.  Thermal conductivity distribution with depth in Qiabuqia of the Gonghe Basin

    图  4  恰卜恰东西向地热地质剖面图(剖面位置见图 2)

    Figure  4.  The EW directional geothermal geological profile in Qiabuqia of the Gonghe Basin (The profile location shown in Fig. 2)

    图  5  共和盆地周边地表温泉分布示意图

    Figure  5.  The schematic map of surface hot spring distribution in the Gonghe Basin

    表  1  共和盆地干热岩钻孔地温梯度计算

    Table  1.   Geothermal gradient of hot dry rock boreholes in the Gonghe Basin

    序号 井号 花岗岩
    埋深
    /m
    花岗岩
    顶界地温
    /℃
    钻孔
    深度
    /m
    孔底
    温度
    /℃
    地温梯度
    /(℃/100 m)
    1 DR3 1340 112 2927 180.27 4.30
    2 DR4 1402 111 3102 182.32 4.20
    3 GR1 1350 104.5 3705 236 5.58
    4 GR2 940 82 3003 182 4.85
    平均 4.73
    下载: 导出CSV

    表  2  共和盆地干热岩体积法资源估算

    Table  2.   Resource estimation of dry hot rock based on volumetric method in the Gonghe Basin

    序号 计算层位
    /m
    计算厚度
    /m
    面积
    /km2
    顶板岩石温度
    /℃
    计算深度岩石
    温度/℃
    热量
    /×1018 J
    折合标准煤
    /×108 t
    备注
    1 3000~3700 700 14000 6.34 236 3899.87 1332.38 实测温度
    2 3000~4000 300 236 254.3 1804.56 616.52 估算温度
    3 3000~5000 1000 254.3 315.3 7494.96 2560.63 估算温度
    4 3000~6000 1000 315.3 376.3 8974.74 3066.19 估算温度
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-03-05
  • 修回日期:  2019-06-21
  • 刊出日期:  2019-08-01

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