OR/14/026 Modelled volume, purpose and scale

Hulbert A G, Terrington R L. 2014. Metadata report for the East Midlands region of the Pennine Basin 1:250 000 resolution geological model. British Geological Survey Internal Report, OR/14/026.

Figure 1 Modelled area (in red) Topological Map - Ordnance Survey data © Crown copyright and database right 2014.

This is a faulted GOCAD® regional model extending onshore across Nottinghamshire, Lincolnshire, Leicestershire, Cambridgeshire and parts of Norfolk (Figure 1). The model was constructed from digital data compiled for the East Midlands Subsurface Memoir (Pharoah et al., 2011). The results of the study are contained in the 1:625 000 scale structure contour, preserved thickness and subcrop maps (Figures 2 and 3) that accompany the Subsurface Memoir, so the data and model generated is regional to national in scale.

The model was developed as part of the Regional UK Lithoframe Programme, the aim of which was to convert the structural data interpreted in the subsurface memoirs into 3D models. Other models in this series include the Craven Basin, the Northumberland-Solway Basin, the south-west Pennine Basin and Weald Basin models. The East Midlands model provides an understanding of the regional bedrock structure in Eastern Central England (particularly for the Carboniferous rocks) and extends from +250 to -4400m OD.

As the East Midlands Model was derived from digital data compiled for the Regional Subsurface Memoir series, tasks such as drawing seismic interpretation to well control have already been performed. This document describes the process of creating a GOCAD® model from derived digital contour data.

Figure 2 Example structural contour map of the Variscan Unconformity from the East Midlands Subsurface Memoir from Pharaoh et al (2011).

Figure 3 Modelled Variscan Unconformity surface (depth range in metres).