OR/14/028 Modelled volume, purpose and scale

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Hulbert A G, Terrington R L. 2015. Metadata report for the Weald Basin 1:250 000 resolution geological model. British Geological Survey Internal Report, OR/14/028.
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 Kent, Surrey, Sussex, Hampshire and the Isle of Wight and offshore into the English Channel (Figure 1). The model was constructed from data digitally derived from the Weald Basin Report (Chadwick et al., 1983[1]). The results of the study are contained in structure contour maps of various scales (1:50 000, 1:100 000 and 1:250 000) but it was decided that the 1:250 000 scale maps covering the whole area were the appropriate ones to use for consistency. An example of one of these maps can be seen in Figure 2. An example of the type of surface produced from this data can be seen in Figure 3.

The model was developed as part of the Regional UK Lithoframe Programme, to convert the structural data interpreted in the subsurface memoirs and other subsurface reports into 3D models. The Weald Basin model provides an understanding of the regional bedrock structure for the Mesozoic and later strata.in Northern England (particularly for the Carboniferous rocks) and extends from +300 to -2600m OD.

As the Weald Basin Model was derived from digital data compiled for an earlier BGS report, 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 Top of the Variscan Basement from the Weald Report.
Figure 3 Modelled Top of the Variscan Basement surface (depth range in metres).

Reference

  1. CHADWICK, R A, EVANS, C J, HOLLOWAY, S, KIRBY, G A, LAMB, R C, PENN, I E, and SMITH, N J P. 1983. Hydrocarbon prospectivity of the Weald and Eastern English Channel. Institute of Geological Sciences (BGS), DP/83/3.