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https://doi.org/10.5194/se-2020-15
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-2020-15
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  10 Feb 2020

10 Feb 2020

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A revised version of this preprint is currently under review for the journal SE.

Fracture attribute scaling and connectivity in the Devonian Orcadian Basin with implications for geologically equivalent sub-surface fractured reservoirs

Anna M. Dichiarante1,2, Ken J. W. McCaffrey1,3, Robert E. Holdsworth1,3, Tore I. Bjornarå4, and Edward D. Dempsey5 Anna M. Dichiarante et al.
  • 1Department of Earth Sciences, Durham University, Durham DH1 3LE, UK
  • 2NORSAR, Kjeller, Norway
  • 3Geospatial Research Ltd, 1 Hawthorn Terrace, Durham, DH1 4EL, UK
  • 4NGI – Norges Geotekniske Institutt
  • 5Department of Geography, Geology and Environment, University of Hull, Hull HU6 7RX, UK

Abstract. Fracture attribute scaling and connectivity datasets from analogue systems are widely used to inform sub-surface fractured reservoir models in a range of geological settings. However, significant uncertainties are associated with the determination of reliable scaling parameters in surface exposures, particularly for fault widths and fracture aperture. This has limited our ability to upscale key parameters that control fluid-flow at reservoir to basin scales. In this study, we present nine 1D transect (scanline) fault and fracture attribute datasets from Middle Devonian sandstones in Caithness (Scotland) that are widely used as an onshore analogue for nearby sub-surface reservoirs such as the Clair Field, West of Shetland. Our multiscale analysis confirms power-law behaviours for both length over 8 orders of magnitude (10−4 to 104) and fracture aperture and fault width (including fills) over 4 orders of magnitude (10−6 to 10−2). We also present a 2D fault and fracture topology analysis which allows assessment of the heterogeneity of connectivity and self similarity. This multiscale approach provides a new basis for upscaling micro- to meso-scale fracture attributes collected in outcrop analogues for use in static and dynamic reservoir models at reservoir to basin scales.

Anna M. Dichiarante et al.

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Fracture attribute scaling and connectivity in the Devonian Orcadian Basin with implications for geologically equivalent sub-surface fractured reservoirs A. Dichiarante, K. McCaffrey, Ro. Holdsworth, T. Bjornara, and E. Dempsey https://doi.org/10.15128/r1cv43nw819

Anna M. Dichiarante et al.

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Latest update: 20 Sep 2020
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Short summary
We studied the characteristics of fracture systems in the Devonian rocks of the Orcadian Basin in Caithness. These mineral-filled fractures have properties that may be used to predict the size and spatial arrangement of similar structures in offshore basins. This includes the Clair field in the Faroe-Shetland basin.
We studied the characteristics of fracture systems in the Devonian rocks of the Orcadian Basin...
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