Difference between revisions of "OR/19/015 Subsurface temperatures"

From Earthwise
Jump to: navigation, search
(No difference)

Revision as of 10:24, 28 May 2019

Busby, J P. 2019. Thermal conductivity and subsurface temperature data pertaining to the Glasgow Geothermal Energy Research Field Site (GGERFS). British Geological Survey Open Report, OR/19/015.

This section of the report lists temperature data within a 20 km radius of the GGERFS. Some of this data has already been presented in Monaghan et al. (2017)[1] where a comprehensive review of heat flow and temperature data was made. However, some extra data has been located since that report was written and is presented here. The locations of the measured data are shown in Figure 4 which is taken from Monaghan et al. (2017)[1].

Figure 4    Locations of measured temperature data within a 20 km radius of the Clyde Gateway (CG) area. Contains Ordnance Survey data © Crown copyright and database rights. All rights reserved [2019] Ordnance Survey [100021290 EUL].

Listings of subsurface temperature data are shown in Appendix 2 - Measured subsurface temperature data, where the data types are defined as follows;

EQM Equilibrium temperatures
BHT Bottom hole temperatures
LOG Wireline log temperatures
MWT Mine water temperatures
DST Drill stem test derived temperatures

The data added here that wasn’t included in Monaghan et al. (2017)[1] comprises the following four items.

1. Bargeddie No. 1. Four extra drill stem test temperatures have been obtained from DECC Onshore Wells (M. Quinn pers. comm.) which provides a temperature gradient over a depth interval of 260 m.

2. Maryhill. The full equilibrium temperature log from Wheildon et al. (1985)[2] is listed over the depth range 6–303 m, rather than just the single temperature at 303 m depth.

3. Clachie Bridge. Oxburgh (1982)[3] in an unpublished report to J D Garnish at ETSU (Energy Technology Support Unit), presents the results of heat flow measurements in which thermal conductivities and temperature gradients are listed. No temperatures are given and so it is not possible to reconstruct the temperature log from the Oxburgh report. However, a single temperature at 300 m depth is given by Burley et al. (1984)[4] from which the temperature log presented here has been derived. Although the temperature type has been listed as LOG, given that this was a heat flow borehole it is very likely that the temperatures were at equilibrium.

4. Hurlet House. Temperature gradients are listed by Oxburgh (1982)[3] for the Hurlet House borehole, which was logged in 1979. There are no temperatures, so in order to construct a temperature log the mean annual air temperature, calculated from 1975–1979 has been obtained from the Paisley Mett Office weather station (https://www.metoffice.gov.uk/pub/data/weather/uk/climate/stationdata/paisleydata.txt). This station is located only 3.8 km from the Hurlet House borehole and is at an elevation of +1.69 m compared to the borehole site, which equates to a temperature difference of +0.01°C at the borehole site. This mean annual air temperature of 9.2°C has been assumed to be the ground temperature at 15 m depth, beneath the zone affected by seasonal fluctuations. As for Clachie Bridge, it is likely that these are equilibrium temperatures.

Temperatures are listed by borehole in Appendix 2 - Measured subsurface temperature data.

References

  1. 1.0 1.1 1.2 MONAGHAN, A A, O'DOCHARTAIGH, B, FORDYCE, F, LOVELESS, S, ENTWISLE, D, QUINN, M, SMITH, K, ELLEN, R, ARKLEY, S, KEARSEY, T, CAMPBELL, S D G, FELLGETT, M, and MOSCA, I. 2017. UKGEOS — Glasgow Geothermal Energy Research Field Site (GGERFS): Initial summary of the geological platform. British Geological Survey Open Report, OR/17/006. 207pp.
  2. WHEILDON, J, GEBSKI, J S, and THOMAS-BETTS, A. 1985. Further Investigations of the UK Heat Flow Field (1981–1984). Investigation of the Geothermal Potential of the UK. British Geological Survey, Keyworth, Nottingham.
  3. 3.0 3.1 OXBURGH, E R. 1982. Compilation of heat flow data measured by the Oxford University Heat Flow Group under contract to the Department of Energy. Unpublished document submitted to J. D. Garnish, ETSU, Harwell.
  4. BURLEY, A J, EDMUNDS, W M, and GALE, I N. 1984. Investigation of the geothermal potential of the UK: catalogue of geothermal data for the land area of the United Kingdom; Second revision. British Geological Survey, 161pp. (WJ/GE/84/20) (Unpublished).