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{{OR/17/048}}
Compiled information on the UK stress field shows differences of up to two MPakm-1 in Sv and Shmin between areas of Cheshire, Lancashire and East Yorkshire North Nottinghamshire. Data from Cheshire and Lancashire region have provided estimates of Sv pore pressure and Shmin near the Proposed UKGEO southern site. Pore pressure is likely to be between 10.19 and 10.8 MPakm-1, Sv between 23–25 MPaKm-1 and Shmin has been estimated using leak-off test data to have a value of 17.4 MPakm-1.

The conclusions of this report are based on the integration of published legacy data and information from the BGS archives. Locally it has allowed characterisation of the stress field and in particular Sv, Shmin and Pp. There are no locations within the regions studied which contain sufficient data to study trends or variations in: Sv, Shmin or SHMax with depth, with the exception of studies at Preese Hall and Sellafield (Baker Hughes, 2011<ref name="Baker 2011">Baker Hughes. 2011. Wellbore Failure Analysis and Geomechanical Modelling in the Bowland Shales, Blackpool, UK, GMI. Peliminary Technical Report. Cuadrilla Resources. Last Accessed 04-Feb-2017. </ref>: Nirex, 1997<ref name="Nirex 1997">Nirex. 1997. Sellafield Geological and Hydrogeological Investigations: Assessment of In-situ Stress Field at Sellafield. Nirex Report S/97/003.</ref>).

The UKGEO project provides a unique opportunity to study the relationships between Sv, Pp, Shmin and SHMax at a variety of depths at a single locality in the UK subsurface. It could also provide an example of how these stresses affect borehole stability over an extended period of time.

Collecting drill core, XLOT’s, wireline RFT, borehole imaging and density logs from surface would allow detailed investigation of the stress field at the site. This would then form the basis for a geomechanical model, which aid the design and implementation of innovative subsurface energy technologies.
==References==
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[[Category: OR/17/048 State of stress across UK regions | 09]]

OR/17/048 Further work - Revision history

Dbk: 1 revision imported

Ajhil at 15:43, 20 September 2017