The temperature of Britain's coalfields

Farr, Gareth; Busby, Jon; Wyatt, Lee; Crooks, J. H. A.; Schofield, David; Holden, Andrew

doi:10.1144/qjegh2020-109

Cited by 25 publications

(19 citation statements)

References 30 publications

(31 reference statements)

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“…In short, colder injected water may increase the chance of slip on a given fault. In the UK, our knowledge of the subsurface temperature field is increasing (Beamish & Busby, 2016;Farr et al, 2021), but we need more data, and again, especially from faulted rocks.…”

Section: Discussionmentioning

confidence: 99%

Comment on se-2021-100

Rossetti¹

2021

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Section: Discussionmentioning

confidence: 99%

Comment on se-2021-100

Rossetti¹

2021

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“…Initial plans for shallow mine geothermal schemes include passive dewatering which may not change the loading on faults by much. However, active dewatering schemes can promote ingress of deeper ground water (Farr et al, 2021), and as this fluid flow must be driven by gradients in fluid pressure, this could in turn lead to the instability of faults at depth. The models below are for a depth of 2 km.…”

Section: Coalfields In South Wales and Greater Manchester Ukmentioning

confidence: 99%

De-risking the energy transition by quantifying the uncertainties in fault stability

Healy¹,

Hicks²

2022

Preprint

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The operations needed to decarbonise our energy systems increasingly involve faulted rocks in the subsurface. To manage the technical challenges presented by these rocks and the justifiable public concern over induced seismicity, we need to assess the risks. Widely used measures for fault stability, including slip and dilation tendency and fracture susceptibility, can be combined with Response Surface Methodology from engineering and Monte Carlo simulations to produce statistically viable ensembles for the analysis of probability. In this paper, we describe the implementation of this approach using custom-built open source Python code (pfs – probability of fault slip). The technique is then illustrated using two synthetic datasets and two case studies drawn from active or potential sites for geothermal energy in the UK, and discussed in the light of induced seismicity focal mechanisms. The analysis of probability highlights key gaps in our knowledge of the stress field, fluid pressures and rock properties. Scope exists to develop, integrate and exploit citizen science projects to generate more and better data, and simultaneously include the public in the necessary discussions about hazard and risk.

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“…Important factors for mine water heat resources include the presence and connectivity of flooded, abandoned mine workings, groundwater flow directions and recharge, pumping rate information, temperature, water levels and chemistry (e.g. Ramos et al 2015, Loredo et al 2016Banks et al 2017;Farr et al 2020), as well as land availability and heat demand. Flooded mine workings can act as a thermal reservoir, with the potential to provide both heat recovery and heat storage, as required.…”

Section: A C C E P T E Dmentioning

confidence: 99%

Drilling into mines for heat: geological synthesis of the UK Geoenergy Observatory in Glasgow and implications for mine water heat resources

Monaghan

Starcher

Barron

et al. 2021

QJEGH

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Thermal energy from groundwater in abandoned, flooded, coal mines has the potential to make a significant contribution to decarbonisation of heat and Net-Zero carbon emissions. In Glasgow, UK, a subsurface observatory has been constructed for mine water heat and heat storage research. We synthesise geological and mine water resource findings from a four-year period of borehole planning, drilling, logging and testing. The heterogenous bedrock is typical of the Scottish Coal Measures Group, whereas superficial deposits are more sand- and gravel-dominated than prognosed. Mine water boreholes encountered workings in the Glasgow Upper, Glasgow Ell and Glasgow Main coal seams, proving water-filled voids, mine waste, fractured rock mass and intact coal pillars with high yields on initial hydrogeological testing. Whilst the depth and extent of mine workings delineated on mine abandonment plans proved accurate, metre-scale variability was expected and proved in the boreholes. A mine water reservoir classification established from the observatory boreholes highlights the resource potential in areas of total extraction, stowage, and stoop and room workings. Since their spatial extent is more extensive across the UK than shafts or roadways, increasing the mine water energy evidence base and reducing exploration risk in these types of legacy workings is important.Supplementary material Borehole reports and other datasets are available at https://ukgeos.ac.uk/data-downloads (mixture of over 20 DOI datasets and reports/data packs published openly on https://nora.nerc.ac.uk, all material is deposited in the National Geoscience Data Centre)

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The temperature of Britain's coalfields

Cited by 25 publications

References 30 publications

Comment on se-2021-100

Comment on se-2021-100

De-risking the energy transition by quantifying the uncertainties in fault stability

Drilling into mines for heat: geological synthesis of the UK Geoenergy Observatory in Glasgow and implications for mine water heat resources

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