冰岛为什么能用地热满足全国约九成的供暖需求以及相当一部分电力?
Why can Iceland supply roughly nine-tenths of its space heating, along with much of its electricity, from geothermal energy?
冰岛横跨大西洋中脊,欧亚板块与北美板块在此离散张裂,玄武质地壳薄且断裂渗透率高,浅部即存在岩浆热源,地温梯度远超全球平均。高温蒸汽田驱动Nesjavellir、Hellisheidi等地热电站发电,做功后的尾水再经管道接入区域供热网络。这种先发电、后供热的梯级利用方式,使地热与水电共同构成冰岛一次能源的两大支柱。
Iceland straddles the Mid-Atlantic Ridge, where the Eurasian and North American plates pull apart, leaving thin, heavily fractured basaltic crust with magma heat sources at shallow depth and geothermal gradients far above the world average. High-temperature steam fields drive power plants such as Nesjavellir and Hellisheidi, and the spent fluid is piped onward into district-heating networks. This cascaded use, electricity first and district heat afterwards, makes geothermal, alongside hydropower, one of the two pillars of Iceland's primary energy supply.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23
来源 · Source
Tarbuck & Lutgens,《Earth Science》第14版,Pearson,2015
E. J. Tarbuck and F. K. Lutgens, Earth Science, 14th ed., Pearson, 2015
#离散型板块边界 #地热梯级利用
高温地热系统为什么集中出现在板块边界,干热岩与常规水热系统在成因上有何不同?
Why are high-temperature geothermal systems concentrated at plate boundaries, and how do hot dry rock systems differ genetically from conventional hydrothermal ones?
高温地热系统需要浅成岩浆房或年轻火成岩体作热源,因而集中出现在洋脊、俯冲带与大陆裂谷等板块边界。常规水热系统还依赖渗透热储、盖层与大气降水补给,热水沿断裂带对流循环。干热岩则通过人工压裂在深部低渗高温岩体中造储,注入冷水取热,不依赖天然热储与天然流体。
High-temperature systems need a shallow magma chamber or young igneous rock mass as their heat source, so they cluster at mid-ocean ridges, subduction zones, and continental rifts. Conventional hydrothermal systems additionally depend on a permeable reservoir, a caprock, and meteoric recharge, with hot water convecting along fault zones. Hot dry rock systems instead create a reservoir by hydraulic stimulation in deep, low-permeability hot rock and extract heat with injected cold water, needing neither a natural reservoir nor natural fluids.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
佟伟、章铭陶等《西藏地热》,科学出版社,1981 ; 另见: Barbier, Geothermal energy technology and current status, Renewable and Sustainable Energy Reviews, 2002
Barbier, Geothermal energy technology and current status, Renewable and Sustainable Energy Reviews, 2002 ; see also: 佟伟、章铭陶等《西藏地热》,科学出版社,1981
独立核验依据 · Independent verification: 核验依据 1 CROSSREF 标识 10.1016/s1364-0321(02)00002-3：Geothermal ene
#地热资源 #热储工程
增强型地热系统为什么能在没有天然温泉的地方发电?
How can enhanced geothermal systems generate power where no natural hot springs exist?
直答:EGS靠人工压裂在高温干热岩中造出裂隙储层,注入冷水取热发电,无需天然温泉或蒸汽田。机理:先钻注采井对,以水力压裂连通天然节理形成换热网络;泵入的水流经灼热裂隙面吸热,从生产井返回地面驱动涡轮发电后回灌循环;主要瓶颈一是诱发微地震风险,需实时监测并调控注水压力,二是深井钻探与建井成本高昂,经济性依赖长寿命单井出力。
EGS builds its own reservoir: wells drilled into hot dry rock are hydraulically fractured so natural joints link into a heat-exchange network, no natural springs needed. Cold water pumped down absorbs heat from the hot fracture surfaces and returns through the production well to drive turbines before reinjection. The main bottlenecks are induced microseismicity, managed by monitoring and pressure control, and the high cost of deep drilling and completion.
难度 进阶 · 适合 小学高段(9-12)
CC BY 4.0 · 已核验 · Verified 2026-11-03
来源 · Source
Tester et al., The Future of Geothermal Energy, MIT-led report, 2006
J. W. Tester et al., The Future of Geothermal Energy, MIT-led report, 2006
独立核验依据 · Independent verification: 核验依据 1 ARCHIVE 标识 futureofgeotherm0000unse：The future of geothe
#增强型地热 #干热岩 #清洁能源