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by John Parnell, Mas'ud Baba, Stephen Bowden, and David Muirhead

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1 Subsurface biodegradation of crude oil in a fractured basement reservoir, Shropshire, UK
by John Parnell, Mas'ud Baba, Stephen Bowden, and David Muirhead Journal of the Geological Society Volume 174(4): July 5, 2017 © 2017 The Author(s)‏

2 Schematic section through potential fractured basement reservoir.
Schematic section through potential fractured basement reservoir. Settings for samples (key in Fig. 2) are shown for case in Shropshire where basement is Precambrian, pre-uplift sediments are Lower Palaeozoic and post-uplift sediments are Carboniferous. John Parnell et al. Journal of the Geological Society 2017;174: © 2017 The Author(s)‏

3 Outline geological map of region of Shropshire including sample sites.
Outline geological map of region of Shropshire including sample sites. BH, Bayston Hill; D, Downton; E, Emstrey; HC, Hanwood Colliery; HH, Haughmond Hill; NH, Nills Hill, PH, Pitchford Hall, RB, Row Brook; RT, Robin's Tump; S, Snailbeach; TT, Tar Tunnel; W, Wrentnall. John Parnell et al. Journal of the Geological Society 2017;174: © 2017 The Author(s)‏

4 Bitumen in Longmyndian metasediments, in hand specimen.
Bitumen in Longmyndian metasediments, in hand specimen. (a) Bitumen in globules in quartz-lined fractures, Bayston Hill; (b) fracture surface coated with mixed calcite and bitumen, Bayston Hill; (c) close-up of mineralized fractures, showing multiple generations of both calcite and bitumen, Bayston Hill; (d) fracture-fill barite crystals mixed with bitumen, cut by breccia zone containing wallrock fragments, Haughmond Hill; (e) breccia zone of wallrock fragments suspended in bitumen, Downton; (f) bitumen-coated fracture, subsequently slickensided, Haughmond Hill. Field widths: (a) 5 cm; (b) 25 cm; (c) 2 cm; (d) 6 cm; (e) 5 cm; (f) 10 cm. John Parnell et al. Journal of the Geological Society 2017;174: © 2017 The Author(s)‏

5 Ion chromatograms for m/z 191 and 177, showing identification of hopanes and norhopanes.
John Parnell et al. Journal of the Geological Society 2017;174: © 2017 The Author(s)‏

6 John Parnell et al. Journal of the Geological Society 2017;174:655-666
© 2017 The Author(s)‏

7 John Parnell et al. Journal of the Geological Society 2017;174:655-666
© 2017 The Author(s)‏

8 Cross-plot of sterane and hopane maturity parameters.
Cross-plot of sterane and hopane maturity parameters. Recent seepages show lower norhopane/hopane ratios then mineralized samples. John Parnell et al. Journal of the Geological Society 2017;174: © 2017 The Author(s)‏

9 Scanning electron photomicrographs of bitumen in Longmyndian metasediments.
Scanning electron photomicrographs of bitumen in Longmyndian metasediments. (a) Authigenic quartz (Q) in bitumen (B); (b) barite (Ba) and calcite (Ca) crystals in bitumen (B); (c) chlorite (CL), calcite (Ca), quartz (Q) and barite (Ba) in bitumen (B); (d) pyrite crystals (bright) in bitumen (dark) and mixed potassium feldspar and albite (F); (e) brookite (B) and potassium feldspar (K) in bitumen (dark); (f) intermixed feldspars (F) and bitumen (B). (a) Bayston Hill; (b–f) Haughmond Hill. John Parnell et al. Journal of the Geological Society 2017;174: © 2017 The Author(s)‏

10 Paragenesis of bitumen-bearing fractures, based on petrographic study of samples from Bayston Hill and Haughmond Hill quarries. Paragenesis of bitumen-bearing fractures, based on petrographic study of samples from Bayston Hill and Haughmond Hill quarries. John Parnell et al. Journal of the Geological Society 2017;174: © 2017 The Author(s)‏

11 Photomicrograph of two-phase fluid inclusions in calcite, Bayston Hill.
Photomicrograph of two-phase fluid inclusions in calcite, Bayston Hill. Inclusions fluoresce bluish white under UV light. John Parnell et al. Journal of the Geological Society 2017;174: © 2017 The Author(s)‏

12 Homogenization temperatures for calcite-hosted fluid inclusions, Bayston Hill.
John Parnell et al. Journal of the Geological Society 2017;174: © 2017 The Author(s)‏

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