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引用本文:张森琦,严维德,黎敦朋,贾小丰,张盛生,李胜涛,付雷,吴海东,曾昭发,李志伟,穆建强,程正璞,胡丽莎. 青海省共和县恰卜恰干热岩体地热地质特征[J]. 中国地质, 2018, 45(6): 1087-1102.
ZHANG Senqi,YAN Weide,LI Dunpeng,JIA Xiaofeng,ZHANG Shengsheng,LI Shengtao,FU Lei,WU Haidong,ZENG Zhaofa,LI Zhiwei,MU Jianqiang,CHENG Zhengpu,HU Lisha. Characteristics of geothermal geology of the Qiabuqia HDR in Gonghe Basin, Qinghai Province[J]. Geology in China, 2018, 45(6): 1087-1102(in Chinese with English abstract).
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青海省共和县恰卜恰干热岩体地热地质特征
张森琦1, 严维德2, 黎敦朋3, 贾小丰1, 张盛生4, 李胜涛1, 付雷1, 吴海东1, 曾昭发5, 李志伟6, 穆建强7, 程正璞1, 胡丽莎1
1.中国地质调查局水文地质环境地质调查中心, 河北 保定 071051;2.青海省国土资源厅, 青海 西宁 810001;3.福州大学紫金矿业学院, 福建 福州 350116;4.青海省水文地质工程地质环境地质调查院, 青海 西宁 810008;5.吉林大学地球探测科学与技术学院, 吉林 长春 130026;6.中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室, 湖北 武汉 430077;7.中国冶金地质总局地球物理勘查院, 河北 保定 071051
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。
关键词:  共和盆地  干热岩  地温梯度  地热地质
DOI:10.12029/gc20180601
分类号:P314.2
基金项目:中国地质调查局地质调查项目(DD20160192、DD20179033、DD20179621)资助。
Characteristics of geothermal geology of the Qiabuqia HDR in Gonghe Basin, Qinghai Province
ZHANG Senqi1, YAN Weide2, LI Dunpeng3, JIA Xiaofeng1, ZHANG Shengsheng4, LI Shengtao1, FU Lei1, WU Haidong1, ZENG Zhaofa5, LI Zhiwei6, MU Jianqiang7, CHENG Zhengpu1, HU Lisha1
1.Center for Hydrogeology and Environmental Geology Survey, China Geological Survey, Baoding 071051, Hebei, China;2.Department of Land and Resources of Qinghai, Xining 810002, Qinghai, China;3.School of Zijin Mine, Fuzhou University, Fuzhou 350116, Fujian, China;4.Institute of Hydrogeology, Engineering Geology and Environmental Geology Survey of Qinghai, Xining 810008, Qinghai, China;5.School of Resources and Environment, Jilin University, Changchun 130026, Jilin, China;6.State Key Lab of Geodesy and Geodynamics, Chinese Academy of Sciences, Wuhan 350116, Hubei, China;7.Geophysical Exploration Institute of China Metallurgical Geology Bureau, Baoding 071000, Hebei, China
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.
Key words:  Gonghe Basin  hot dry rock  geothermal gradient  geothermal  geology