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DOI | 10.1038/NGEO2879 |
Potentially exploitable supercritical geothermal resources in the ductile crust | |
Watanabe, Noriaki1; Numakura, Tatsuya1; Sakaguchi, Kiyotoshi1; Saishu, Hanae2; Okamoto, Atsushi1; Ingebritsen, Steven E.3; Tsuchiya, Noriyoshi1 | |
2017-02-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2017 |
卷号 | 10期号:2 |
文章类型 | Article |
语种 | 英语 |
国家 | Japan; USA |
英文摘要 | The hypothesis that the brittle-ductile transition (BDT) drastically reduces permeability implies that potentially exploitable geothermal resources (permeability > 10(-16) m(2)) consisting of supercritical water could occur only in rocks with unusually high transition temperatures such as basalt. However, tensile fracturing is possible even in ductile rocks, and some permeabilitydepth relations proposed for the continental crust show no drastic permeability reduction at the BDT. Here we present experimental results suggesting that the BDT is not the first-order control on rock permeability, and that potentially exploitable resources may occur in rocks with much lower BDT temperatures, such as the granitic rocks that comprise the bulk of the continental crust. We find that permeability behaviour for fractured granite samples at 350-500 degrees C under effective confining stress is characterized by a transition from a weakly stress-dependent and reversible behaviour to a strongly stress-dependent and irreversible behaviour at a specific, temperature-dependent effective confining stress level. This transition is induced by onset of plastic normal deformation of the fracture surface (elastic-plastic transition) and, importantly, causes no 'jump' in the permeability. Empirical equations for this permeability behaviour suggest that potentially exploitable resources exceeding 450 degrees C may form at depths of 2-6 km even in the nominally ductile crust. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000394121800019 |
WOS关键词 | HYDROTHERMAL SYSTEMS ; THERMAL-DAMAGE ; PERMEABILITY ; FLUID ; ROCK ; GRANITE ; TRANSITION ; PRESSURE ; BRITTLE ; JAPAN |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/34678 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Tohoku Univ, Grad Sch Environm Studies, Dept Environm Studies Adv Soc, Sendai, Miyagi 9800845, Japan; 2.Natl Inst Adv Ind Sci & Technol, Renewable Energy Res Ctr, Koriyama, Fukushima 9630298, Japan; 3.US Geol Survey, 345 Middlefield Rd, Menlo Pk, CA 94025 USA |
推荐引用方式 GB/T 7714 | Watanabe, Noriaki,Numakura, Tatsuya,Sakaguchi, Kiyotoshi,et al. Potentially exploitable supercritical geothermal resources in the ductile crust[J]. NATURE GEOSCIENCE,2017,10(2). |
APA | Watanabe, Noriaki.,Numakura, Tatsuya.,Sakaguchi, Kiyotoshi.,Saishu, Hanae.,Okamoto, Atsushi.,...&Tsuchiya, Noriyoshi.(2017).Potentially exploitable supercritical geothermal resources in the ductile crust.NATURE GEOSCIENCE,10(2). |
MLA | Watanabe, Noriaki,et al."Potentially exploitable supercritical geothermal resources in the ductile crust".NATURE GEOSCIENCE 10.2(2017). |
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