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1 Rider-French Consulting Cambridge Ltd, Cambridge Science Park, Milton Road, Cambridge, CB4 4GG, UK
2 Collinson Jones Consulting, 56 Shropshire Street, Market Drayton, Shropshire TF3 9DA, UK
3 Department of Earth Sciences, Oxford University, Parks Road, Oxford OX1 3PR, UK
Detailed analogue dipmeter measurements have been made along a 430 m roadcut in the Upper Namurian Rough Rock at Elland in Yorkshire. A series of 21 vertical sections were measured with dip and azimuth (dip-log) readings taken every 0.2 m, which were calibrated to previously described sedimentological sections and recordings of surface natural gamma ray profiles.
The inter-relationship between the scale of sedimentary structures and dipmeter processing parameters is shown by dip-log measurements in medium scale, crossbedded sedimentary structures. The analysis of grouped dip-log data is seen to give palaeocurrents very similar to those measured by traditional methods at outcrop. The relationship between sedimentological facies and ‘dip-log facies’ is applied to reservoir characterization, and statistical analysis of dip-log data is demonstrated to be an aid to inter-well comparisons.
Analysis techniques, mainly computer based and applicable in the subsurface, are applied to the outcrop data and the implications for subsurface dipmeter studies are stressed.
