OR/15/013 Model development log

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Woods, M A, Newell, A J, Haslam, R, Farrant, A R and Smith, H. 2015. A physical property model of the Chalk of southern England. British Geological Survey Internal Report, OR/15/013.

The following abbreviations are used for staff members involved in model development:

AJN: Andy Newell (Project Leader, GOCAD-SKUA Modeller)

MAW: Mark Woods (Stratigraphical and facies interpretation of borehole geophysical logs) RH: Richard Haslam (Interpretation of Chalk structural geology)

ARF: A R Farrant (Interpretation of outcrop stratigraphy) HS: Helen Smith (Interpretation of outcrop stratigraphy)

March 2013 – April 2014:

MAW: WellCad interpretation of stratigraphy and facies in c. 130 borehole geophysical logs. Initial phase of log interpretation aimed at building a robust model framework using logs with large vertical coverage (c. +100 m) in the Chalk, providing approximate coverage of one borehole log every 20 km2 across the Chalk south of The Wash. SOBI borehole well path, stratigraphy and marker-bed data written to Excel pro-formas. Lithofacies data compiled into WellCad files exported to text and Excel files, using IF factors to translate lithofacies data into a numerical code appropriate for modelling.

RH: Georeferencing of published map. Digitising of structural data. Filtering of the DiGMap 50k for fault data. Coding of fault attribute tables. ARF, HS: WellCad interpretation of facies in published outcrop sections (predominantly BGS publications and data in the Geological Conservation Review of the Chalk by Mortimore et al. (2001)[1]. Compilation of marker-bed data into Excel pro-forma. Export of WellCad files to text and Excel format, using IF factors to translate lithofacies data into a numerical code appropriate for modelling. AJN: Loading first batch of borehole data into SKUA-GOCAD 2013.2, cross-section construction and initial trials and experimentation with the SKUA structure and stratigraphy and property modelling workflows.

April 2014 – January 2015:

MAW: WellCad interpretation of stratigraphy and facies in c. 175 borehole geophysical logs. These logs infill areas between boreholes interpreted in Year 1, and include logs that form the basis of previous project work on the Chalk, including London, Berkshire Downs, East Kent, North Kent, East Anglia (Thetford, Saffron Walden), Hertford, Beaconsfield, Salisbury, Marlborough. Other logs include a suite of hydrocarbons boreholes that form a component of a separate BGS project using geophysics to investigate the primary porosity of the Chalk. Lithofacies data compiled into WellCad files exported to text and Excel files, using IF factors to translate lithofacies data into a numerical code appropriate for modelling.

RH: Interpretation of the geophysical data. Interpretation of fault network. Preliminary 3D fault network model and export of fault network as triangulated surfaces. ARF, HS: WellCad interpretation of facies in published outcrop sections, concentrating on published papers and BGS Technical Reports. Compilation of marker-bed data into Excel pro- forma. Export of WellCad files to text and Excel format, using IF factors to translate lithofacies data into a numerical code appropriate for modelling. AJN: Loading second batch of borehole data into SKUA-GOCAD 2013.2, cross-section construction and further trials and experimentation with the SKUA structure and stratigraphy and property modelling work-flows.

Reference

  1. MORTIMORE, R N, WOOD, C J, and GALLOIS, R W. 2001. British Upper Cretaceous Stratigraphy. Geological Conservation Review Series, No. 23. (Peterborough: Joint Nature Conservation Committee.)