This dataset contains the borehole image interpretation of the United Downs 1 borehole, Cornwall (BGSID: 21246966) The acoustic borehole images have been interpreted for faults, breakouts and conductive and resistive fractures. For faults and fractures each line in the file defines a plane passing through the borehole. This includes: • Depth at which the plane intersects the borehole wall, this is defined as the midpoint of the feature as each plane has a top and bottom intersection. • Azimuth, this is the azimuth of the dip direction of the plane, it is at 90 degrees to the strike of the feature. • Dip, this is the dip angle of the plane. • Type, this is a classification of the feature. For breakouts each line represents an individual feature which covers and area of the borehole wall. This includes: • Depth the midpoint depth of the breakout. • Azimuth, this is the orientation of the breakout. • Type, this is a classification of the feature. • Breakout Height, the length of the breakout in meters. • Breakout Width, the width of the breakout in degrees. • Type, this is a classification of the feature. The work was undertaken by BGS as part of the GWatt Project award reference number NE/S004262/1. It was funded by the UKRI Natural Environment Research Council.

This datasets contains 323 observations of borehole breakouts across and drilling induced tensile fractures from borehole imaging used to re-characterise the UK stress field orientation in 2016. This was published in the Journal of Marine and Petroleum Geology and is openly available using doi:10.1016/j.marpetgeo.2016.02.012 The observations relate to 39 wells from Central and Northern England and are provided with links to screen grabs of the images for clarity. The basic well meta data is supplied along with a description of the dataset. The Images were generated in the IMAGE DISPLAY module of the Landmark RECALL software. and are supplied on an “as shown” basis. Descriptions of the tools and the techniques used are listed in the accompanying paper: KINGDON, A., FELLGETT, M. W. & WILLIAMS, J. D. O. 2016. Use of borehole imaging to improve understanding of the in-situ stress orientation of Central and Northern England and its implications for unconventional hydrocarbon resources. Marine and Petroleum Geology, 73, 1-20.

This data contains raw electrical resistivity tomography (ERT) measurements made at the UKGEOS (United Kingdom Geoenergy Observatories) site at Thornton science park in Cheshire, as well as associated metadata, during February 2025. The measurements in this case were made in support of a 3-day closed loop heat injection test starting on the 10th of February 2025. During the test approx. 24kW of heat was equally distributed between 4 observatory heat exchanger boreholes via a circulating heat exchange fluid. This resulted in the fluid delivery temperature increasing from 12 to 27C. The ERT data was collected from 12 boreholes instrumented with ERT electrodes at 1m intervals from 12 to 96 m below the ground surface to facilitate down and cross- hole imaging with electrical currents (1008 electrodes in total). The electrodes are connected to a geoelectrical monitoring system comprising two PRIME servers (1 and 2) which are installed at the site indefinitely. The PRIME instrument is bespoke developed by the British Geological Survey (BGS) for long term geoelectrical monitoring applications, in this case the purpose of the data is to study how the electrical resistivity of the ground responds to temperature changes and other hydrogeological processes. Metadata includes the position of the electrodes within the subsurface, furthermore, finite element meshes are included to aid the user in processing this data. There is a readme (text) file provided with this data that describes its formatting and usage. This data is managed by BGS.

This datasets contains 323 observations of borehole breakouts across and drilling induced tensile fractures from borehole imaging used to re-characterise the UK stress field orientation in 2016. This was published in the Journal of Marine and Petroleum Geology and is openly available using doi:10.1016/j.marpetgeo.2016.02.012 The observations relate to 39 wells from Central England, Northern England and Northern Scotland and are provided with links to screen grabs of the images for clarity. The basic well metadata is supplied along with a description of the dataset. The Images were generated in the IMAGE DISPLAY module of the Landmark RECALL software and are supplied on an “as shown” basis. Descriptions of the tools and the techniques used are listed in the accompanying paper: KINGDON, A., FELLGETT, M. W. & WILLIAMS, J. D. O. 2016. Use of borehole imaging to improve understanding of the in-situ stress orientation of Central and Northern England and its implications for unconventional hydrocarbon resources. Marine and Petroleum Geology, 73, 1-20.