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The application of elemental geochemistry to UK onshore unconventional plays

By
David A. Riley
David A. Riley
1
Chemostrat Ltd, 2 Ravenscroft Court, Buttington Cross Enterprise Park, Welshpool SY21 8SL, UK
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Tim J. Pearce
Tim J. Pearce
1
Chemostrat Ltd, 2 Ravenscroft Court, Buttington Cross Enterprise Park, Welshpool SY21 8SL, UK
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Eliza Mathia
Eliza Mathia
2
Chemostrat Inc, 3760 Westchase Drive, Houston, TX 77042, USA
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Ken Ratcliffe
Ken Ratcliffe
2
Chemostrat Inc, 3760 Westchase Drive, Houston, TX 77042, USA
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John Martin
John Martin
1
Chemostrat Ltd, 2 Ravenscroft Court, Buttington Cross Enterprise Park, Welshpool SY21 8SL, UK
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Published:
January 01, 2018

Abstract

The Namurian and Westphalian sequences from the onshore well Scaftworth-B2, located in the Gainsborough Trough, central England, have been analysed for whole-rock inorganic geochemical data via inductively coupled plasma optical emission spectrometry (ICP-OES) and mass spectrometry (MS). The changes within key elements, and elemental ratios, results in a chemostratigraphic zonation scheme consisting of eight chemostratigraphic sequences and 13 chemostratigraphic packages, providing the type zonation for the Bowland Shale and overlying formations. Mineralogical data are provided by whole rock X-ray diffraction (XRD) and are used to calibrate the mineral modelling in order to generate a modelled mineral log for the study well. Furthermore, the modelled mineralogy is then used to calculate a relative brittleness for the samples, which can then be collaborated with traditional rock properties data at a later date. Elemental data can also be used to model the relative abundance of detrital quartz and biogenic silica; while total silicon is detected by ICP, biogenic silica is not detected by XRD owing to its amorphous nature. Enrichment factors calculated from the inorganic elemental data suggest that the sediment was deposited in an unrestricted marine setting, which experienced periods of anoxia.

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Contents

Geological Society, London, Special Publications

Petroleum Geology of NW Europe: 50 Years of Learning – Proceedings of the 8th Petroleum Geology Conference

M. Bowman
M. Bowman
University of Manchester, UK
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B. Levell
B. Levell
University of Oxford, UK
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The Geological Society of London
Volume
8
ISBN electronic:
9781786203151
Publication date:
January 01, 2018

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