Geothermal exploration in the Fell Sandstone Formation (Mississippian) beneath the city centre of Newcastle upon Tyne, UK: the Newcastle Science Central Deep Geothermal Borehole

Geothermal exploration in the Fell Sandstone Formation (Mississippian) beneath the city centre of Newcastle upon Tyne, UK: the Newcastle Science Central Deep Geothermal Borehole
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英国泰恩河畔纽卡斯尔市中心下方的费尔砂岩地层(密西西比)地热勘探:纽卡斯尔科学中心深地热钻孔

DOI:
10.1144/qjegh2016-053
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发表时间:
2016
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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通过对1821米深的纽卡斯尔科学中心深地热钻孔的钻探和测试,可以从泰恩河畔纽卡斯尔地下相当于费尔砂岩地层(石炭纪:密西西比)的横向地层中回收地热能的假设得到了检验。这证明了1400米以下376.5米的Fell砂岩组,其中大部分类似于露头处发现的辫状河沉积物,尽管一些较低的部分变红了,产生了风成亲和的颗粒。达到热平衡后的井下测井证明,1740米处的温度为73℃,热流估计约为88 mW m - 2。这个相对较高的值可能反映了从北奔宁基岩沿着90英寻断层,在80公里的距离上,热量的深层对流转移。经证明,井眼穿过的瀑布砂岩具有较低的水力导电性(约7 × 10−5m d−1)。进入井中的水是高盐的,具有Na - (Ca) - cl特征,与该地区遇到的其他温水相似。在未来的定向钻井中,需要确定是否可以遇到足够的天然裂缝渗透率,或者对井进行改造,以支持商业采热。
The postulate that geothermal energy might be recoverable from strata laterally equivalent to the Fell Sandstone Formation (Carboniferous: Mississippian) beneath Newcastle upon Tyne has been examined by the drilling and testing of the 1821 m deep Newcastle Science Central Deep Geothermal Borehole. This proved 376.5 m of Fell Sandstone Formation below 1400 m, much of which resembled braided river deposits found at outcrop, although some lower portions were reddened and yielded grains of aeolian affinity. Downhole logging after attainment of thermal equilibrium proved a temperature of 73°C at 1740 m, and allowed estimation of heat flow at about 88 mW m−2. This relatively high value probably reflects deep convective transfer of heat over a distance of >8 km from the North Pennine Batholith, along the Ninety Fathom Fault. The Fell Sandstone traversed by the borehole proved to be of low hydraulic conductivity (c. 7 × 10−5m d−1). The water that entered the well was highly saline, with a Na–(Ca)–Cl signature similar to other warm waters encountered in the region. It remains for future directional drilling to establish whether sufficient natural fracture permeability can be encountered, or wells stimulated, to support commercial heat production.
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