OR/16/052 QA of 3D geological models and cross-sections

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Kessler, H, Terrington, R, Wood, B, Ford, J, Myers, T, Thorpe, S, and Burke, H. 2016. Specification of in- and output data formats and deliverables for commissioned 3D geological models. British Geological Survey Internal Report, OR/16/052.

In order for a geological model to be approved for publication or delivery to a client a series of QA checks is carried out. This includes visual examination of the modelled cross-sections to ensure that they match each other at cross-section intersections and fit the borehole and geological map data used. The model calculation is checked to ensure that all units calculate to their full extent within the area of interest and the modelled geological surfaces are checked for artefacts such as spikes and thickness anomalies. The naming convention of the modelled geological units is checked to ensure that recognised entries in the BGS Lexicon of Named Rock Units (www.bgs.ac.uk/lexicon/home.html) and the BGS Rock Classification Scheme (www.bgs.ac.uk/bgsrcs/) are used as far as possible. Any issues found in the QA checking process are recorded and addressed before delivery/publication of the model.

Geological models are accompanied by a standard metadata report which describes the datasets used in the model and records any geological decisions made during the model construction process. An example model metadata report describing the London Basin superficial and bedrock Lithoframe 50 model can be found on the NERC Open Research Archive at www.nora.nerc.ac.uk/507607/