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
Younger P
中科院分区:
地球科学4区
文献类型:
--
作者:
Younger P

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在英国Weardale花岗岩进行低焓地热资源钻探时,发现410 m深处存在极高的渗透率。伊斯特盖特的钻孔是沿着一个古老的、近垂直的热液脉结构(Slitt脉)的轴向下的,证明了一个超过4000达西米(= 3 × 10− 9平方米)的transmittance,这是有史以来在花岗岩侵入体深处测量到的最高值之一。超过24小时的持续水力测试表明,这种transmittance不是钻孔的局部:持续的流动和水位下降的稳定表明,这种transmittance沿着裂隙脉结构的走向持续存在。虽然这一发现是令人鼓舞的地热能开发的前景,在这个和类似的花岗岩,它提出了令人不安的问题,在规划放射性废物隔离有关的可行的最大渗透性可能会遇到花岗岩的假设。
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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