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

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

张盛生^{1, 2,},
张磊^{1, 2},
田成成^{1, 2},
蔡敬寿^{1, 2},
唐保春^{1, 2}

1.
青海省水文地质工程地质环境地质调查院, 青海西宁 810008
2.
青海省水文地质及地热地质重点实验室, 青海西宁 810008

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
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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

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

ZHANG Shengsheng^{1, 2
,},
ZHANG Lei^{1, 2},
TIAN Chengcheng^{1, 2},
CAI Jingshou^{1, 2},
TANG Baochun^{1, 2}

1.
Institute of the Hydrogeology and Enigieering Geology of Qinghai, Xining 810008, Qinghai, China
2.
Key Laboratory of Hydrogeology and Geothermal Geology of Qinghai Province, Xining 810008, Qinghai, China

摘要

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。
- 共和盆地 /
- 干热岩 /
- 地温梯度 /
- 花岗岩
Abstract: The Gonghe Basin is rich in hot dry rock geothermal resources. In order to enhance the theoretical understanding of the genesis of hot dry rock geothermal resources in the Gonghe Basin and further promote the exploration of hot dry rock resources, a comprehensive analysis of the genesis of hot dry rock resources in the Gonghe Basin is made from the heat source mechanism, caprock conditions and reservoir characteristics. Firstly, combined with regional geological structure analysis, geothermal geological survey, geophysical (aeromagnetic, earthquake) interpretation, four hot dry rock exploration wells with the depth of 2927-3705 m were drilled in the Gonghe Basin. At 3705 m, the high-quality hot dry rock resources of 236℃ were obtained, which was the first major breakthrough in the exploration of hot dry rock geothermal resources in China's non-modern volcanic areas. Secondly, radioactivities of granites from different depths were tested. The results show that the radioactive elements content of U, Th and K in the granitoids of the Gonghe Basin is slightly higher than the background value of the earth, and the radioactive heat generation rate is relatively low, the contribution of radioactive heat to the heat source of hot dry rock is less and the heat source may come from the melt in the Crust. Thirdly, based on geological data analysis and aeromagnetic interpretation, the potential hot dry rock distribution area of the Gonghe Basin is about 1.4×10⁴ km². Finally, the volumetric method is used to evaluate the potential of hot dry rock resources in the Gonghe Basin. The results show that the total conservative and static amount of hot dry rock resources in the 3.0-6.0 km range of the Gonghe Basin is 8974.74×10¹⁸ J, and the converted standard coal can reach 306.619 billion tons, showing the broad prospects for development and utilization.
- Gonghe Basin /
- hot dry rock /
- geothermal gradient /
- granite
注释:

责任编辑：吴芳

HTML全文

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

下载: 全尺寸图片幻灯片

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

下载: 全尺寸图片幻灯片

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

下载: 全尺寸图片幻灯片

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)

下载: 全尺寸图片幻灯片

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

下载: 全尺寸图片幻灯片

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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