Hyper-permeable granite: lessons from test-pumping in the Eastgate Geothermal Borehole, Weardale, UK
Hyper-permeable granite: lessons from test-pumping in the Eastgate Geothermal Borehole, Weardale, UK
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高渗透性花岗岩:英国威尔代尔 Eastgate 地热钻孔的试抽经验教训
DOI:
10.1144/1470-9236/08-085
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发表时间:
2010
影响因子:
1.4
通讯作者:
Younger P
中科院分区:
文献类型:
--
作者:
Younger P
AbstractExtremely high permeability has been found at 410 m depth in the Weardale Granite, UK, during exploratory drilling for low-enthalpy geothermal resources. The Eastgate Borehole was sunk down the axis of an ancient, sub-vertical hydrothermal vein structure (the Slitt Vein), proving a transmissivity in excess of 4000 darcy m (= 3 × 10−9m2m), which is one of the highest values ever measured deep within a granite intrusion. Sustained hydraulic testing over 24 h showed that this transmissivity was not local to the borehole: sustained flows and steadying of drawdown suggest that this transmissivity persists along the strike of the Slitt Vein structure. Although this finding is encouraging in relation to the prospects for geothermal energy development in this and similar granites, it raises disquieting issues in relation to assumptions commonly made during planning for radioactive waste isolation concerning the feasible maximum permeability likely to be encountered in granite.
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DOI:
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发表时间:
2006
期刊:
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2000
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