Characteristics of geothermal geology of the Qiabuqia HDR in Gonghe Basin, Qinghai Province
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摘要:
基于地热地质、综合地球物理勘查成果等布孔依据,实施的GR1干热岩勘探孔位于共和县恰卜恰干热岩体中南部,是迄今我国钻遇地层温度最高的干热岩勘探孔,为我国首个EGS示范工程与科研试验平台建设奠定了基础。GR1孔测温结果表明,2500 m深处温度为150℃,进入干热岩段;终孔深度3705 m处的井底温度为236℃。2500~3705 m井段平均地温梯度为71.4℃/km,高于另3眼干热岩勘探孔;2800~3705 m井段地温梯度大于80℃/km,属中等品质以上干热岩。综合地球物理勘查与4眼干热岩勘探孔钻探结果表明,该干热岩体埋深2104.31~2500 m,面积246.90 km2;干热岩资源评价结果表明,3~5 km深度范围,100年内的潜在发电装机容量为3805.74 MW,以2%的采收率计,装机容量为76.11 MW;3~6 km潜在装机容量为7788.26 MW,以2%的采收率计,装机容量为155.77MW;3~7 km潜在装机容量为13639.25 MW,以2%的采收率计,装机容量为272.79 MW。
Abstract:Based on regional geology, geothermal geology and integrated geophysical exploration results, the GR1 hot dry rock exploration well was completed in the central part of Qiabuqia Town in the Gonghe basin. The GR1 well is the highest temperature hot-dry rock exploration well in China, which has laid an important foundation for China's first EGS demonstration project. The temperature measurement results show that the temperature at the depth of 2500 m is 150℃, entering into the hot dry rock section. The temperature of the bottom hole at the depth of 3705 m is 236℃. The average geothermal gradient of 2500-3705 m is 71.4℃/km, which is higher than that of the other 3 hot dry rock exploration wells. At 2800-3705 m of GR1 well the geothermal gradient is higher than 80℃/km. The exploration results show that the depth of the hot dry rock is 2104.31-2500 m, which is oval-shaped in the east-west direction, with an area of 246.90 km2. The evaluation results show that the total theoretical resources of the Qiabuqia hot dry rock is 1638.16EJ in the depth of 3-5 km, equivalent to 55.909 billion tons of standard coal.
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Key words:
- Gonghe Basin /
- hot dry rock /
- geothermal gradient /
- geothermal
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图 1 研究区大地构造位置图(张雪亭等,2007)
Figure 1.
表 1 共和盆地周缘造山带印支期主要岩体统计
Table 1. Statistical table of rock masses of orogenic belt surrounding Gonghe Basin in the Indosinian periods
表 2 恰卜恰地区地热与干热岩钻孔统计
Table 2. Geothermal and hot dry rock drilling statistics in Qiabuqia area
表 3 GR1孔随钻留点温度计测温结果
Table 3. The temperature measurement results during drilling with thermometer in GR1 well
表 4 恰卜恰地区干热岩勘探孔统计
Table 4. The statistical table of HDR exploration wells in Qiabuqia area
表 5 中国干热岩资源调查评价阶段初步划分方案
Table 5. Preliminary divisions of investigation and evaluation stage for China's dry hot rock resources
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